id stringlengths 29 47 | gold_id stringclasses 300
values | source_benchmark stringclasses 5
values | original_sentence stringclasses 300
values | length_words int64 3 137 | perturbation_axis stringclasses 2
values | perturbation_category stringclasses 10
values | perturbed_sentence stringlengths 12 926 ⌀ | subtlety_note stringlengths 36 332 | changed_span unknown | diff_pretty stringlengths 26 329 ⌀ | status stringclasses 3
values | verify_notes listlengths 1 3 ⌀ | phonemes_pert stringclasses 596
values |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
emergent-tts-eval_0000__substitution | emergent-tts-eval_0000 | emergent-tts-eval | Looking out at the first sprouts emerging in her garden, Elena's eyes shone with optimism as she whispered, "This year will be different. I can feel it in my bones. The harvest will be bountiful beyond our wildest dreams." | 39 | hallucination | substitution | Looking out at the first sprouts emerging in her garden, Elena's eyes shone with optimism as she whispered, "This year will be different. I can feel it in my bones. The harvest will be bountiful beyond our mildest dreams." | Changed 'wildest' to 'mildest'. The single-consonant shift (w to m) is acoustically subtle and preserves sentence rhythm, but significantly shifts the idiom's meaning. | {
"op": "replace",
"original": "wildest",
"perturbed": "mildest",
"position": 37
} | Looking out at ... bountiful beyond our [wildest -> mildest] dreams." | done | null | null |
emergent-tts-eval_0000__deletion | emergent-tts-eval_0000 | emergent-tts-eval | Looking out at the first sprouts emerging in her garden, Elena's eyes shone with optimism as she whispered, "This year will be different. I can feel it in my bones. The harvest will be bountiful beyond our wildest dreams." | 39 | hallucination | deletion | Looking out at the sprouts emerging in her garden, Elena's eyes shone with optimism as she whispered, "This year will be different. I can feel it in my bones. The harvest will be bountiful beyond our wildest dreams." | Deleting 'first' removes the temporal nuance that these are the very initial growths of the season, while the sentence remains entirely fluent. | {
"op": "delete",
"original": "first",
"perturbed": "",
"position": 4
} | Looking out at the [-first] sprouts emerging in ... our wildest dreams." | done | null | null |
emergent-tts-eval_0000__insertion | emergent-tts-eval_0000 | emergent-tts-eval | Looking out at the first sprouts emerging in her garden, Elena's eyes shone with optimism as she whispered, "This year will be different. I can feel it in my bones. The harvest will be bountiful beyond our wildest dreams." | 39 | hallucination | insertion | Looking out at the first sprouts emerging in her garden, Elena's eyes shone with optimism as she whispered, "This year will finally be different. I can feel it in my bones. The harvest will be bountiful beyond our wildest dreams." | Inserting 'finally' fits seamlessly into the character's hopeful tone, blending naturally with 'This year will be different' while introducing a subtle implication of past disappointment. | {
"op": "insert",
"original": "",
"perturbed": "finally",
"position": 21
} | Looking out at ... "This year will [+finally] be different. I ... our wildest dreams." | done | null | null |
emergent-tts-eval_0000__repetition | emergent-tts-eval_0000 | emergent-tts-eval | Looking out at the first sprouts emerging in her garden, Elena's eyes shone with optimism as she whispered, "This year will be different. I can feel it in my bones. The harvest will be bountiful beyond our wildest dreams." | 39 | hallucination | repetition | Looking out at the first sprouts emerging in her garden, Elena's eyes shone with optimism as she whispered, "This year will be different. I can feel it in my my bones. The harvest will be bountiful beyond our wildest dreams." | Repeating 'my' creates a brief speech hesitation that listeners naturally gloss over during fluent audio playback. | {
"op": "insert",
"original": "",
"perturbed": "my",
"position": 29
} | Looking out at ... it in my [+my] bones. The harvest ... our wildest dreams." | done | null | null |
emergent-tts-eval_0000__truncation | emergent-tts-eval_0000 | emergent-tts-eval | Looking out at the first sprouts emerging in her garden, Elena's eyes shone with optimism as she whispered, "This year will be different. I can feel it in my bones. The harvest will be bountiful beyond our wildest dreams." | 39 | hallucination | truncation | Looking out at the first sprouts emerging in her garden, Elena's eyes shone with optimism as she whispered, "This year will be different. I can feel it in my bones. The harvest will be bountiful." | The remaining sentence ends on a complete, grammatically sound clause, making the removal of the prepositional phrase 'beyond our wildest dreams' seamless to a casual listener. | {
"op": "replace",
"original": "bountiful beyond our wildest dreams.\"",
"perturbed": "bountiful.\"",
"position": 34
} | Looking out at ... harvest will be [bountiful beyond our wildest dreams." -> bountiful."] | done | null | null |
emergent-tts-eval_0000__reordering | emergent-tts-eval_0000 | emergent-tts-eval | Looking out at the first sprouts emerging in her garden, Elena's eyes shone with optimism as she whispered, "This year will be different. I can feel it in my bones. The harvest will be bountiful beyond our wildest dreams." | 39 | hallucination | reordering | Looking out at the first emerging sprouts in her garden, Elena's eyes shone with optimism as she whispered, "This year will be different. I can feel it in my bones. The harvest will be bountiful beyond our wildest dreams." | Reordered 'sprouts emerging' to 'emerging sprouts'. Both word orders are entirely natural and idiomatic, making the difference almost impossible to catch without direct word-for-word tracking. | [
{
"op": "insert",
"original": "",
"perturbed": "emerging",
"position": 5
},
{
"op": "delete",
"original": "emerging",
"perturbed": "",
"position": 6
}
] | Looking out at the first [+emerging] sprouts [-emerging] in her garden, ... our wildest dreams." | done | null | null |
emergent-tts-eval_0000__mispronunciation | emergent-tts-eval_0000 | emergent-tts-eval | Looking out at the first sprouts emerging in her garden, Elena's eyes shone with optimism as she whispered, "This year will be different. I can feel it in my bones. The harvest will be bountiful beyond our wildest dreams." | 39 | intelligibility | mispronunciation | Looking out at the first sprouts emerging in her garden, Elena's eyes shone with optimism as she whispered, "This year will be different. I can feel it in my bones. The harvest will be bountful beyond our wildest dreams." | Deleting the middle vowel ('i') forces the TTS to pronounce 'bountiful' as a two-syllable word (/ˈbaʊntfʊl/ instead of /ˈbaʊntɪfəl/), which sounds like slightly clipped speech that a casual listener easily misses. | {
"op": "replace",
"original": "bountiful",
"perturbed": "bountful",
"position": 34
} | Looking out at ... harvest will be [bountiful -> bountful] beyond our wildest dreams." | done | null | /ˈbaʊntfʊl/ |
emergent-tts-eval_0000__syllable_drop | emergent-tts-eval_0000 | emergent-tts-eval | Looking out at the first sprouts emerging in her garden, Elena's eyes shone with optimism as she whispered, "This year will be different. I can feel it in my bones. The harvest will be bountiful beyond our wildest dreams." | 39 | intelligibility | syllable_drop | Looking out at the first sprouts emerging in her garden, Elena's eyes shone with optimism as she whispered, "This year will be diffrent. I can feel it in my bones. The harvest will be bountiful beyond our wildest dreams." | Dropping the unstressed middle 'e' in 'different' to form 'diffrent' mimics natural fast-speech syncope, which listeners and casual readers easily smooth over mentally. | {
"op": "replace",
"original": "different.",
"perturbed": "diffrent.",
"position": 22
} | Looking out at ... year will be [different. -> diffrent.] I can feel ... our wildest dreams." | done | null | /ˈdɪf.ɹənt/ |
emergent-tts-eval_0000__word_boundary | emergent-tts-eval_0000 | emergent-tts-eval | Looking out at the first sprouts emerging in her garden, Elena's eyes shone with optimism as she whispered, "This year will be different. I can feel it in my bones. The harvest will be bountiful beyond our wildest dreams." | 39 | intelligibility | word_boundary | null | No adjacent word pair in this sentence allows for a natural word boundary shift without altering phonemes or creating ungrammatical nonsense. | null | null | not_applicable | [
"model returned null (category not applicable)"
] | null |
emergent-tts-eval_0000__stress_shift | emergent-tts-eval_0000 | emergent-tts-eval | Looking out at the first sprouts emerging in her garden, Elena's eyes shone with optimism as she whispered, "This year will be different. I can feel it in my bones. The harvest will be bountiful beyond our wildest dreams." | 39 | intelligibility | stress_shift | null | No heteronym present in the sentence to apply stress shift. | null | null | not_applicable | [
"model returned null (category not applicable)"
] | null |
emergent-tts-eval_0001__substitution | emergent-tts-eval_0001 | emergent-tts-eval | Moments before, he'd been utterly dejected, muttering, "They'll never accept it, never." Professor Jenkins dropped his coffee mug, his jaw hanging open in shock. "You mean to tell me that my research theory was correct all along? The committee has approved my findings? I simply can't fathom it... after all this time, v... | 59 | hallucination | substitution | Moments before, he'd been utterly dejected, muttering, "They'll never accept it, never." Professor Jenkins dropped his coffee mug, his jaw hanging open in shock. "You mean to tell me that my research paper was correct all along? The committee has approved my findings? I simply can't fathom it... after all this time, va... | Replaced 'theory' with 'paper'. Both fit the academic context seamlessly and carry similar syllable counts, making the swap easy to overlook in rapid spoken dialogue. | {
"op": "replace",
"original": "theory",
"perturbed": "paper",
"position": 32
} | Moments before, he'd ... that my research [theory -> paper] was correct all ... is truly astonishing!" | done | null | null |
emergent-tts-eval_0001__deletion | emergent-tts-eval_0001 | emergent-tts-eval | Moments before, he'd been utterly dejected, muttering, "They'll never accept it, never." Professor Jenkins dropped his coffee mug, his jaw hanging open in shock. "You mean to tell me that my research theory was correct all along? The committee has approved my findings? I simply can't fathom it... after all this time, v... | 59 | hallucination | deletion | Moments before, he'd been utterly dejected, muttering, "They'll never accept it, never." Professor Jenkins dropped his coffee mug, his jaw hanging open in shock. "You mean to tell me that my theory was correct all along? The committee has approved my findings? I simply can't fathom it... after all this time, validation... | Deleting 'research' removes the specific academic qualifier of his theory without disrupting sentence flow or tone. | {
"op": "delete",
"original": "research",
"perturbed": "",
"position": 31
} | Moments before, he'd ... me that my [-research] theory was correct ... is truly astonishing!" | done | null | null |
emergent-tts-eval_0001__insertion | emergent-tts-eval_0001 | emergent-tts-eval | Moments before, he'd been utterly dejected, muttering, "They'll never accept it, never." Professor Jenkins dropped his coffee mug, his jaw hanging open in shock. "You mean to tell me that my research theory was correct all along? The committee has approved my findings? I simply can't fathom it... after all this time, v... | 59 | hallucination | insertion | Moments before, he'd been utterly dejected, muttering, "They'll never accept it, never." Professor Jenkins dropped his coffee mug, his jaw hanging open in shock. "You mean to tell me that my research theory was correct all along? The committee has already approved my findings? I simply can't fathom it... after all this... | Inserting 'already' flows naturally in spoken English, shifting the temporal emphasis slightly without disrupting the expressive rhythm of disbelief. | {
"op": "insert",
"original": "",
"perturbed": "already",
"position": 40
} | Moments before, he'd ... The committee has [+already] approved my findings? ... is truly astonishing!" | done | null | null |
emergent-tts-eval_0001__repetition | emergent-tts-eval_0001 | emergent-tts-eval | Moments before, he'd been utterly dejected, muttering, "They'll never accept it, never." Professor Jenkins dropped his coffee mug, his jaw hanging open in shock. "You mean to tell me that my research theory was correct all along? The committee has approved my findings? I simply can't fathom it... after all this time, v... | 59 | hallucination | repetition | Moments before, he'd been utterly dejected, muttering, "They'll never accept it, never." Professor Jenkins dropped his coffee mug, his jaw hanging open in shock. "You mean to tell me that my research theory was correct all all along? The committee has approved my findings? I simply can't fathom it... after all this tim... | Repeating 'all' mimics a natural spoken hesitation that easily passes unnoticed in emotional dialogue. | {
"op": "insert",
"original": "",
"perturbed": "all",
"position": 36
} | Moments before, he'd ... was correct all [+all] along? The committee ... is truly astonishing!" | done | null | null |
emergent-tts-eval_0001__truncation | emergent-tts-eval_0001 | emergent-tts-eval | Moments before, he'd been utterly dejected, muttering, "They'll never accept it, never." Professor Jenkins dropped his coffee mug, his jaw hanging open in shock. "You mean to tell me that my research theory was correct all along? The committee has approved my findings? I simply can't fathom it... after all this time, v... | 59 | hallucination | truncation | Moments before, he'd been utterly dejected, muttering, "They'll never accept it, never." Professor Jenkins dropped his coffee mug, his jaw hanging open in shock. "You mean to tell me that my research theory was correct all along? The committee has approved my findings? I simply can't fathom it... after all this time, v... | Ending on 'validation at last!' serves as a natural and dramatic conclusion to the monologue, making the omission of the final exclamation 'This is truly astonishing!' easily overlooked. | {
"op": "replace",
"original": "last! This is truly astonishing!\"",
"perturbed": "last!\"",
"position": 54
} | Moments before, he'd ... time, validation at [last! This is truly astonishing!" -> last!"] | done | null | null |
emergent-tts-eval_0001__reordering | emergent-tts-eval_0001 | emergent-tts-eval | Moments before, he'd been utterly dejected, muttering, "They'll never accept it, never." Professor Jenkins dropped his coffee mug, his jaw hanging open in shock. "You mean to tell me that my research theory was correct all along? The committee has approved my findings? I simply can't fathom it... after all this time, v... | 59 | hallucination | reordering | Moments before, he'd been utterly dejected, muttering, "They'll never accept it, never." Professor Jenkins dropped his coffee mug, his jaw hanging open in shock. "You mean to tell me that my research theory was all along correct? The committee has approved my findings? I simply can't fathom it... after all this time, v... | Moved 'all along' before 'correct' instead of after it. Prepositional phrase positioning relative to the predicate adjective sounds natural in dramatic dialogue. | [
{
"op": "delete",
"original": "correct",
"perturbed": "",
"position": 34
},
{
"op": "replace",
"original": "along?",
"perturbed": "along correct?",
"position": 36
}
] | Moments before, he'd ... research theory was [-correct] all [along? -> along correct?] The committee has ... is truly astonishing!" | done | null | null |
emergent-tts-eval_0001__mispronunciation | emergent-tts-eval_0001 | emergent-tts-eval | Moments before, he'd been utterly dejected, muttering, "They'll never accept it, never." Professor Jenkins dropped his coffee mug, his jaw hanging open in shock. "You mean to tell me that my research theory was correct all along? The committee has approved my findings? I simply can't fathom it... after all this time, v... | 59 | intelligibility | mispronunciation | Moments before, he'd been udderly dejected, muttering, "They'll never accept it, never." Professor Jenkins dropped his coffee mug, his jaw hanging open in shock. "You mean to tell me that my research theory was correct all along? The committee has approved my findings? I simply can't fathom it... after all this time, v... | Changing 'tt' to 'dd' induces consonant flapping in TTS, generating a voiced /d/ instead of /t/, which mimics rapid natural American speech and is difficult to catch by ear alone. | {
"op": "replace",
"original": "utterly",
"perturbed": "udderly",
"position": 4
} | Moments before, he'd been [utterly -> udderly] dejected, muttering, "They'll ... is truly astonishing!" | done | null | /ˈʌdərli/ |
emergent-tts-eval_0001__syllable_drop | emergent-tts-eval_0001 | emergent-tts-eval | Moments before, he'd been utterly dejected, muttering, "They'll never accept it, never." Professor Jenkins dropped his coffee mug, his jaw hanging open in shock. "You mean to tell me that my research theory was correct all along? The committee has approved my findings? I simply can't fathom it... after all this time, v... | 59 | intelligibility | syllable_drop | Moments before, he'd been utterly dejected, muttring, "They'll never accept it, never." Professor Jenkins dropped his coffee mug, his jaw hanging open in shock. "You mean to tell me that my research theory was correct all along? The committee has approved my findings? I simply can't fathom it... after all this time, va... | Removing the weak schwa from 'muttering' creates 'muttring', a standard conversational reduction before a liquid consonant that passes unnoticed in fluent audio. | {
"op": "replace",
"original": "muttering,",
"perturbed": "muttring,",
"position": 6
} | Moments before, he'd been utterly dejected, [muttering, -> muttring,] "They'll never accept ... is truly astonishing!" | done | null | /ˈmʌt.ɹɪŋ/ |
emergent-tts-eval_0001__word_boundary | emergent-tts-eval_0001 | emergent-tts-eval | Moments before, he'd been utterly dejected, muttering, "They'll never accept it, never." Professor Jenkins dropped his coffee mug, his jaw hanging open in shock. "You mean to tell me that my research theory was correct all along? The committee has approved my findings? I simply can't fathom it... after all this time, v... | 59 | intelligibility | word_boundary | null | No suitable word boundary re-segmentation pair exists in this sentence that maintains phonetic similarity. | null | null | not_applicable | [
"model returned null (category not applicable)"
] | null |
emergent-tts-eval_0001__stress_shift | emergent-tts-eval_0001 | emergent-tts-eval | Moments before, he'd been utterly dejected, muttering, "They'll never accept it, never." Professor Jenkins dropped his coffee mug, his jaw hanging open in shock. "You mean to tell me that my research theory was correct all along? The committee has approved my findings? I simply can't fathom it... after all this time, v... | 59 | intelligibility | stress_shift | Moments before, he'd been utterly dejected, muttering, "They'll never accept it, never." Professor Jenkins dropped his coffee mug, his jaw hanging open in shock. "You mean to tell me that my re-SEARCH theory was correct all along? The committee has approved my findings? I simply can't fathom it... after all this time, ... | Shifts noun stress from the first syllable (RE-search) to second syllable (re-SEARCH). Listeners easily pass over stress variations on 'research' because both pronunciations are widely heard in common speech. | {
"op": "replace",
"original": "research",
"perturbed": "re-SEARCH",
"position": 31
} | Moments before, he'd ... me that my [research -> re-SEARCH] theory was correct ... is truly astonishing!" | done | null | /rɪˈsɜːrtʃ/ |
emergent-tts-eval_0002__substitution | emergent-tts-eval_0002 | emergent-tts-eval | The queue shuffled forward, a tiny, hopeful sign. "Alright, perhaps this is finally moving along," Tapping his foot rapidly while waiting in the endless line, Jackson glanced at his watch for the tenth time, his voice sharp with impatience, "Could this possibly move any slower? I have an important meeting in twenty min... | 70 | hallucination | substitution | The queue shuffled forward, a tiny, hopeful sign. "Alright, perhaps this is finally moving along," Tapping his foot rapidly while waiting in the endless line, Jackson glanced at his watch for the tenth time, his voice sharp with impatience, "Could this possibly move any slower? I have an important meeting in thirty min... | Changed 'twenty' to 'thirty'. Number substitutions with similar phonetics and identical sentence placement are naturally hard for casual listeners to flag. | {
"op": "replace",
"original": "twenty",
"perturbed": "thirty",
"position": 51
} | The queue shuffled ... important meeting in [twenty -> thirty] minutes that I ... testament to inefficiency!" | done | null | null |
emergent-tts-eval_0002__deletion | emergent-tts-eval_0002 | emergent-tts-eval | The queue shuffled forward, a tiny, hopeful sign. "Alright, perhaps this is finally moving along," Tapping his foot rapidly while waiting in the endless line, Jackson glanced at his watch for the tenth time, his voice sharp with impatience, "Could this possibly move any slower? I have an important meeting in twenty min... | 70 | hallucination | deletion | The queue shuffled forward, a hopeful sign. "Alright, perhaps this is finally moving along," Tapping his foot rapidly while waiting in the endless line, Jackson glanced at his watch for the tenth time, his voice sharp with impatience, "Could this possibly move any slower? I have an important meeting in twenty minutes t... | Deleting 'tiny,' removes the modifier describing how minor the sign of progress was while maintaining natural cadence. | {
"op": "delete",
"original": "tiny,",
"perturbed": "",
"position": 5
} | The queue shuffled forward, a [-tiny,] hopeful sign. "Alright, ... testament to inefficiency!" | done | null | null |
emergent-tts-eval_0002__insertion | emergent-tts-eval_0002 | emergent-tts-eval | The queue shuffled forward, a tiny, hopeful sign. "Alright, perhaps this is finally moving along," Tapping his foot rapidly while waiting in the endless line, Jackson glanced at his watch for the tenth time, his voice sharp with impatience, "Could this possibly move any slower? I have an important meeting in twenty min... | 70 | hallucination | insertion | The queue shuffled forward, a tiny, hopeful sign. "Alright, perhaps this is finally moving along," Tapping his foot rapidly while waiting in the endless line, Jackson glanced at his watch for the tenth time, his voice sharp with impatience, "Could this possibly move any slower? I have a very important meeting in twenty... | Adding 'very' as an intensifier before 'important meeting' is standard conversational usage that easily slips past casual listening. | {
"op": "replace",
"original": "an",
"perturbed": "a very",
"position": 47
} | The queue shuffled ... slower? I have [an -> a very] important meeting in ... testament to inefficiency!" | needs_review | [
"insertion should add a word"
] | null |
emergent-tts-eval_0002__repetition | emergent-tts-eval_0002 | emergent-tts-eval | The queue shuffled forward, a tiny, hopeful sign. "Alright, perhaps this is finally moving along," Tapping his foot rapidly while waiting in the endless line, Jackson glanced at his watch for the tenth time, his voice sharp with impatience, "Could this possibly move any slower? I have an important meeting in twenty min... | 70 | hallucination | repetition | The queue shuffled forward, a tiny, hopeful sign. "Alright, perhaps this is finally moving along," Tapping his foot rapidly while waiting in the endless line, Jackson glanced at his watch for the tenth time, his voice sharp with impatience, "Could this possibly move any slower? I have an important meeting in twenty min... | Repeating the single-letter article 'a' sounds like a minor speech trip that auditory processing automatically filters out. | {
"op": "insert",
"original": "",
"perturbed": "a",
"position": 67
} | The queue shuffled ... complete farce, a [+a] testament to inefficiency!" | done | null | null |
emergent-tts-eval_0002__truncation | emergent-tts-eval_0002 | emergent-tts-eval | The queue shuffled forward, a tiny, hopeful sign. "Alright, perhaps this is finally moving along," Tapping his foot rapidly while waiting in the endless line, Jackson glanced at his watch for the tenth time, his voice sharp with impatience, "Could this possibly move any slower? I have an important meeting in twenty min... | 70 | hallucination | truncation | The queue shuffled forward, a tiny, hopeful sign. "Alright, perhaps this is finally moving along," Tapping his foot rapidly while waiting in the endless line, Jackson glanced at his watch for the tenth time, his voice sharp with impatience, "Could this possibly move any slower? I have an important meeting in twenty min... | Concluding the quote at 'a complete farce!' maintains full emotional cadence and grammatical completeness, concealing the removal of 'a testament to inefficiency!'. | {
"op": "replace",
"original": "farce, a testament to inefficiency!\"",
"perturbed": "farce!\"",
"position": 65
} | The queue shuffled ... is a complete [farce, a testament to inefficiency!" -> farce!"] | done | null | null |
emergent-tts-eval_0002__reordering | emergent-tts-eval_0002 | emergent-tts-eval | The queue shuffled forward, a tiny, hopeful sign. "Alright, perhaps this is finally moving along," Tapping his foot rapidly while waiting in the endless line, Jackson glanced at his watch for the tenth time, his voice sharp with impatience, "Could this possibly move any slower? I have an important meeting in twenty min... | 70 | hallucination | reordering | The queue shuffled forward, a tiny, hopeful sign. "Alright, perhaps this is finally moving along," Tapping his foot rapidly while waiting in the endless line, Jackson glanced for the tenth time at his watch, his voice sharp with impatience, "Could this possibly move any slower? I have an important meeting in twenty min... | Swapped the adjacent prepositional phrases 'at his watch' and 'for the tenth time'. Both orders are grammatically fluent and convey identical rhythm. | [
{
"op": "delete",
"original": "at his watch",
"perturbed": "",
"position": 27
},
{
"op": "replace",
"original": "time,",
"perturbed": "time at his watch,",
"position": 33
}
] | The queue shuffled ... line, Jackson glanced [-at his watch] for the tenth [time, -> time at his watch,] his voice sharp ... testament to inefficiency!" | done | null | null |
emergent-tts-eval_0002__mispronunciation | emergent-tts-eval_0002 | emergent-tts-eval | The queue shuffled forward, a tiny, hopeful sign. "Alright, perhaps this is finally moving along," Tapping his foot rapidly while waiting in the endless line, Jackson glanced at his watch for the tenth time, his voice sharp with impatience, "Could this possibly move any slower? I have an important meeting in twenty min... | 70 | intelligibility | mispronunciation | The queue shuffled forward, a tiny, hopeful sign. "Alright, perhaps this is finally moving along," Tapping his foot rapidly while waiting in the endless line, Jackson glanced at his watch for the tenth time, his voice sharp with impatience, "Could this possibly move any slower? I have an important meeting in twenty min... | Replacing 'a' with 'i' causes the TTS model to synthesize an explicit short /ɪ/ vowel rather than a reduced schwa /ə/, creating a tiny phonetic drift that blends seamlessly into fluent speech. | {
"op": "replace",
"original": "testament",
"perturbed": "testiment",
"position": 67
} | The queue shuffled ... complete farce, a [testament -> testiment] to inefficiency!" | done | null | /ˈtɛstɪmənt/ |
emergent-tts-eval_0002__syllable_drop | emergent-tts-eval_0002 | emergent-tts-eval | The queue shuffled forward, a tiny, hopeful sign. "Alright, perhaps this is finally moving along," Tapping his foot rapidly while waiting in the endless line, Jackson glanced at his watch for the tenth time, his voice sharp with impatience, "Could this possibly move any slower? I have an important meeting in twenty min... | 70 | intelligibility | syllable_drop | The queue shuffled forward, a tiny, hopeful sign. "Alright, perhaps this is finally moving along," Tapping his foot rapidly while waiting in the endless line, Jackson glanced at his watch for the tenth time, his voice sharp with impatience, "Could this posbly move any slower? I have an important meeting in twenty minut... | Reducing 'possibly' to 'posbly' drops the middle weak vowel /ə/, matching natural casual speech elision while leaving the word clearly recognizable. | {
"op": "replace",
"original": "possibly",
"perturbed": "posbly",
"position": 41
} | The queue shuffled ... impatience, "Could this [possibly -> posbly] move any slower? ... testament to inefficiency!" | done | null | /ˈpɑːs.bli/ |
emergent-tts-eval_0002__word_boundary | emergent-tts-eval_0002 | emergent-tts-eval | The queue shuffled forward, a tiny, hopeful sign. "Alright, perhaps this is finally moving along," Tapping his foot rapidly while waiting in the endless line, Jackson glanced at his watch for the tenth time, his voice sharp with impatience, "Could this possibly move any slower? I have an important meeting in twenty min... | 70 | intelligibility | word_boundary | The queue shuffled forward, a tiny, hopeful sign. "Alright, perhaps this is finally moving along," Tapping his foot rapidly while waiting in the endless line, Jackson glanced at his watch for the tenth time, his voice sharp with impatience, "Could this possibly move any slower? I have a nimportant meeting in twenty min... | Shifting the terminal 'n' from 'an' to the start of 'important' ('a nimportant') produces the exact same phonetic sequence /ə.nɪmˈpɔːr.tənt/ in connected speech, making the synthesis acoustically identical to 'an important'. | {
"op": "replace",
"original": "an important",
"perturbed": "a nimportant",
"position": 47
} | The queue shuffled ... slower? I have [an important -> a nimportant] meeting in twenty ... testament to inefficiency!" | done | null | /ə nɪmˈpɔːrtənt/ |
emergent-tts-eval_0002__stress_shift | emergent-tts-eval_0002 | emergent-tts-eval | The queue shuffled forward, a tiny, hopeful sign. "Alright, perhaps this is finally moving along," Tapping his foot rapidly while waiting in the endless line, Jackson glanced at his watch for the tenth time, his voice sharp with impatience, "Could this possibly move any slower? I have an important meeting in twenty min... | 70 | intelligibility | stress_shift | null | No heteronym present in the sentence to apply stress shift. | null | null | not_applicable | [
"model returned null (category not applicable)"
] | null |
emergent-tts-eval_0003__substitution | emergent-tts-eval_0003 | emergent-tts-eval | He first dismissed the faint scratching, muttering softly, "It's just the old house settling, nothing more." His voice then trembled with palpable fear as he stuttered, "There's... there's a stranger at the window. What the hell are you all waiting for?! He's not just looking, he's... he's prying at the lock, we have t... | 58 | hallucination | substitution | He first dismissed the faint scratching, muttering softly, "It's just the old house settling, nothing more." His voice then trembled with palpable fear as he stuttered, "There's... there's a shadow at the window. What the hell are you all waiting for?! He's not just looking, he's... he's prying at the lock, we have to ... | Replaced 'stranger' with 'shadow'. Both start with an 's' sound and fit the dark, fearful scene, though 'shadow' slightly alters the immediate physical threat. | {
"op": "replace",
"original": "stranger",
"perturbed": "shadow",
"position": 29
} | He first dismissed ... "There's... there's a [stranger -> shadow] at the window. ... out of here!" | done | null | null |
emergent-tts-eval_0003__deletion | emergent-tts-eval_0003 | emergent-tts-eval | He first dismissed the faint scratching, muttering softly, "It's just the old house settling, nothing more." His voice then trembled with palpable fear as he stuttered, "There's... there's a stranger at the window. What the hell are you all waiting for?! He's not just looking, he's... he's prying at the lock, we have t... | 58 | hallucination | deletion | He first dismissed the scratching, muttering softly, "It's just the old house settling, nothing more." His voice then trembled with palpable fear as he stuttered, "There's... there's a stranger at the window. What the hell are you all waiting for?! He's not just looking, he's... he's prying at the lock, we have to get ... | Deleting 'faint' removes the auditory detail explaining why he initially dismissed the sound, yet the sentence sounds completely natural. | {
"op": "delete",
"original": "faint",
"perturbed": "",
"position": 4
} | He first dismissed the [-faint] scratching, muttering softly, ... out of here!" | done | null | null |
emergent-tts-eval_0003__insertion | emergent-tts-eval_0003 | emergent-tts-eval | He first dismissed the faint scratching, muttering softly, "It's just the old house settling, nothing more." His voice then trembled with palpable fear as he stuttered, "There's... there's a stranger at the window. What the hell are you all waiting for?! He's not just looking, he's... he's prying at the lock, we have t... | 58 | hallucination | insertion | He first dismissed the faint scratching, muttering softly, "It's just the old house settling, nothing more." His voice then trembled with palpable fear as he stuttered, "There's... there's a stranger at the window. What the hell are you all waiting for?! He's not just looking, he's... he's still prying at the lock, we ... | Inserting 'still' between stuttered phrases preserves the frantic pacing while implying ongoing effort by the intruder. | {
"op": "insert",
"original": "",
"perturbed": "still",
"position": 47
} | He first dismissed ... looking, he's... he's [+still] prying at the ... out of here!" | done | null | null |
emergent-tts-eval_0003__repetition | emergent-tts-eval_0003 | emergent-tts-eval | He first dismissed the faint scratching, muttering softly, "It's just the old house settling, nothing more." His voice then trembled with palpable fear as he stuttered, "There's... there's a stranger at the window. What the hell are you all waiting for?! He's not just looking, he's... he's prying at the lock, we have t... | 58 | hallucination | repetition | He first dismissed the faint scratching, muttering softly, "It's just the old house settling, nothing more." His voice then trembled with palpable fear as he stuttered, "There's... there's a stranger at the window. What the hell are you all waiting for?! He's not just looking, he's... he's prying at the lock, we have t... | Repeating 'of' blends directly into the character's already stammered, fearful delivery without raising suspicion. | {
"op": "insert",
"original": "",
"perturbed": "of",
"position": 57
} | He first dismissed ... get out of [+of] here!" | done | null | null |
emergent-tts-eval_0003__truncation | emergent-tts-eval_0003 | emergent-tts-eval | He first dismissed the faint scratching, muttering softly, "It's just the old house settling, nothing more." His voice then trembled with palpable fear as he stuttered, "There's... there's a stranger at the window. What the hell are you all waiting for?! He's not just looking, he's... he's prying at the lock, we have t... | 58 | hallucination | truncation | He first dismissed the faint scratching, muttering softly, "It's just the old house settling, nothing more." His voice then trembled with palpable fear as he stuttered, "There's... there's a stranger at the window. What the hell are you all waiting for?! He's not just looking, he's... he's prying at the lock!" | Stopping at 'he's prying at the lock!' leaves the panicked exclamation intact and complete, making the drop of 'we have to get out of here!' hard to detect without reading along. | {
"op": "replace",
"original": "lock, we have to get out of here!\"",
"perturbed": "lock!\"",
"position": 50
} | He first dismissed ... prying at the [lock, we have to get out of here!" -> lock!"] | done | null | null |
emergent-tts-eval_0003__reordering | emergent-tts-eval_0003 | emergent-tts-eval | He first dismissed the faint scratching, muttering softly, "It's just the old house settling, nothing more." His voice then trembled with palpable fear as he stuttered, "There's... there's a stranger at the window. What the hell are you all waiting for?! He's not just looking, he's... he's prying at the lock, we have t... | 58 | hallucination | reordering | He first dismissed the faint scratching, softly muttering, "It's just the old house settling, nothing more." His voice then trembled with palpable fear as he stuttered, "There's... there's a stranger at the window. What the hell are you all waiting for?! He's not just looking, he's... he's prying at the lock, we have t... | Shifted adverb 'softly' to precede 'muttering' rather than follow it. Pre-modifying adverbs sound completely standard and easy to miss. | {
"op": "replace",
"original": "muttering softly,",
"perturbed": "softly muttering,",
"position": 6
} | He first dismissed the faint scratching, [muttering softly, -> softly muttering,] "It's just the ... out of here!" | done | null | null |
emergent-tts-eval_0003__mispronunciation | emergent-tts-eval_0003 | emergent-tts-eval | He first dismissed the faint scratching, muttering softly, "It's just the old house settling, nothing more." His voice then trembled with palpable fear as he stuttered, "There's... there's a stranger at the window. What the hell are you all waiting for?! He's not just looking, he's... he's prying at the lock, we have t... | 58 | intelligibility | mispronunciation | He first dismissed the faint scratching, muddering softly, "It's just the old house settling, nothing more." His voice then trembled with palpable fear as he stuttered, "There's... there's a stranger at the window. What the hell are you all waiting for?! He's not just looking, he's... he's prying at the lock, we have t... | Changing 'muttering' to 'muddering' causes the TTS engine to voice the alveolar stop as /d/ rather than /t/, which closely resembles natural speech flapping and passes by unnoticeably. | {
"op": "replace",
"original": "muttering",
"perturbed": "muddering",
"position": 6
} | He first dismissed the faint scratching, [muttering -> muddering] softly, "It's just ... out of here!" | done | null | /ˈmʌdərɪŋ/ |
emergent-tts-eval_0003__syllable_drop | emergent-tts-eval_0003 | emergent-tts-eval | He first dismissed the faint scratching, muttering softly, "It's just the old house settling, nothing more." His voice then trembled with palpable fear as he stuttered, "There's... there's a stranger at the window. What the hell are you all waiting for?! He's not just looking, he's... he's prying at the lock, we have t... | 58 | intelligibility | syllable_drop | He first dismissed the faint scratching, muttring softly, "It's just the old house settling, nothing more." His voice then trembled with palpable fear as he stuttered, "There's... there's a stranger at the window. What the hell are you all waiting for?! He's not just looking, he's... he's prying at the lock, we have to... | Dropping the unstressed vowel in 'muttering' produces 'muttring', mimicking rapid speech syncope that is difficult to spot without close comparison. | {
"op": "replace",
"original": "muttering",
"perturbed": "muttring",
"position": 6
} | He first dismissed the faint scratching, [muttering -> muttring] softly, "It's just ... out of here!" | done | null | /ˈmʌt.ɹɪŋ/ |
emergent-tts-eval_0003__word_boundary | emergent-tts-eval_0003 | emergent-tts-eval | He first dismissed the faint scratching, muttering softly, "It's just the old house settling, nothing more." His voice then trembled with palpable fear as he stuttered, "There's... there's a stranger at the window. What the hell are you all waiting for?! He's not just looking, he's... he's prying at the lock, we have t... | 58 | intelligibility | word_boundary | null | No natural word boundary shift was found that preserves the underlying phoneme sequence without introducing explicit word changes. | null | null | not_applicable | [
"model returned null (category not applicable)"
] | null |
emergent-tts-eval_0003__stress_shift | emergent-tts-eval_0003 | emergent-tts-eval | He first dismissed the faint scratching, muttering softly, "It's just the old house settling, nothing more." His voice then trembled with palpable fear as he stuttered, "There's... there's a stranger at the window. What the hell are you all waiting for?! He's not just looking, he's... he's prying at the lock, we have t... | 58 | intelligibility | stress_shift | null | No heteronym present in the sentence to apply stress shift. | null | null | not_applicable | [
"model returned null (category not applicable)"
] | null |
emergent-tts-eval_0004__substitution | emergent-tts-eval_0004 | emergent-tts-eval | Finding his car window smashed in the parking lot, Omar's face contorted with outrage as he shouted, "Who would do something like this in broad daylight? Has everyone lost their minds completely?" | 32 | hallucination | substitution | Finding his car window smashed in the parking garage, Omar's face contorted with outrage as he shouted, "Who would do something like this in broad daylight? Has everyone lost their minds completely?" | Substituted 'lot' with 'garage'. Both describe automotive parking locations, making the change sound contextually natural while changing the specific setting. | {
"op": "replace",
"original": "lot,",
"perturbed": "garage,",
"position": 8
} | Finding his car ... in the parking [lot, -> garage,] Omar's face contorted ... their minds completely?" | done | null | null |
emergent-tts-eval_0004__deletion | emergent-tts-eval_0004 | emergent-tts-eval | Finding his car window smashed in the parking lot, Omar's face contorted with outrage as he shouted, "Who would do something like this in broad daylight? Has everyone lost their minds completely?" | 32 | hallucination | deletion | Finding his car window smashed in the parking lot, Omar's face contorted with outrage as he shouted, "Who would do something like this in daylight? Has everyone lost their minds completely?" | Deleting 'broad' subtlely weakens the idiomatic emphasis on the audacity of the crime without creating any grammatical oddity. | {
"op": "delete",
"original": "broad",
"perturbed": "",
"position": 24
} | Finding his car ... like this in [-broad] daylight? Has everyone ... their minds completely?" | done | null | null |
emergent-tts-eval_0004__insertion | emergent-tts-eval_0004 | emergent-tts-eval | Finding his car window smashed in the parking lot, Omar's face contorted with outrage as he shouted, "Who would do something like this in broad daylight? Has everyone lost their minds completely?" | 32 | hallucination | insertion | Finding his car window smashed in the parking lot, Omar's face contorted with outrage as he shouted, "Who would even do something like this in broad daylight? Has everyone lost their minds completely?" | Inserting 'even' matches common emotional discourse patterns in exasperated questions, making it sound entirely organic. | {
"op": "insert",
"original": "",
"perturbed": "even",
"position": 19
} | Finding his car ... shouted, "Who would [+even] do something like ... their minds completely?" | done | null | null |
emergent-tts-eval_0004__repetition | emergent-tts-eval_0004 | emergent-tts-eval | Finding his car window smashed in the parking lot, Omar's face contorted with outrage as he shouted, "Who would do something like this in broad daylight? Has everyone lost their minds completely?" | 32 | hallucination | repetition | Finding his car window smashed in the parking lot, Omar's face contorted with outrage as he shouted, "Who would do something like this in in broad daylight? Has everyone lost their minds completely?" | Repeating the preposition 'in' resembles a natural conversational repetition under high emotion. | {
"op": "insert",
"original": "",
"perturbed": "in",
"position": 24
} | Finding his car ... like this in [+in] broad daylight? Has ... their minds completely?" | done | null | null |
emergent-tts-eval_0004__truncation | emergent-tts-eval_0004 | emergent-tts-eval | Finding his car window smashed in the parking lot, Omar's face contorted with outrage as he shouted, "Who would do something like this in broad daylight? Has everyone lost their minds completely?" | 32 | hallucination | truncation | Finding his car window smashed in the parking lot, Omar's face contorted with outrage as he shouted, "Who would do something like this in broad daylight? Has everyone lost their minds?" | Removing only the word 'completely' leaves a standard, idiomatic question ('Has everyone lost their minds?') that sounds completely natural. | {
"op": "replace",
"original": "minds completely?\"",
"perturbed": "minds?\"",
"position": 30
} | Finding his car ... everyone lost their [minds completely?" -> minds?"] | done | null | null |
emergent-tts-eval_0004__reordering | emergent-tts-eval_0004 | emergent-tts-eval | Finding his car window smashed in the parking lot, Omar's face contorted with outrage as he shouted, "Who would do something like this in broad daylight? Has everyone lost their minds completely?" | 32 | hallucination | reordering | Finding his car window smashed in the parking lot, Omar's face contorted with outrage as he shouted, "Who would do something like this in broad daylight? Has everyone completely lost their minds?" | Moved 'completely' before 'lost their minds' instead of sentence-final position. Both placements are extremely natural in spoken English, masking the perturbation. | [
{
"op": "insert",
"original": "",
"perturbed": "completely",
"position": 28
},
{
"op": "replace",
"original": "minds completely?\"",
"perturbed": "minds?\"",
"position": 30
}
] | Finding his car ... daylight? Has everyone [+completely] lost their [minds completely?" -> minds?"] | done | null | null |
emergent-tts-eval_0004__mispronunciation | emergent-tts-eval_0004 | emergent-tts-eval | Finding his car window smashed in the parking lot, Omar's face contorted with outrage as he shouted, "Who would do something like this in broad daylight? Has everyone lost their minds completely?" | 32 | intelligibility | mispronunciation | Finding his car window smashed in the parking lot, Omar's face contorded with outrage as he shouted, "Who would do something like this in broad daylight? Has everyone lost their minds completely?" | Replacing 't' with 'd' in 'contorted' forces a voiced /d/ sound on the third syllable, imitating standard casual speech assimilation that a listener reading along casually would overlook. | {
"op": "replace",
"original": "contorted",
"perturbed": "contorded",
"position": 11
} | Finding his car ... lot, Omar's face [contorted -> contorded] with outrage as ... their minds completely?" | done | null | /kənˈtɔːrdɪd/ |
emergent-tts-eval_0004__syllable_drop | emergent-tts-eval_0004 | emergent-tts-eval | Finding his car window smashed in the parking lot, Omar's face contorted with outrage as he shouted, "Who would do something like this in broad daylight? Has everyone lost their minds completely?" | 32 | intelligibility | syllable_drop | Finding his car window smashed in the parking lot, Omar's face contorted with outrage as he shouted, "Who would do something like this in broad daylight? Has evryone lost their minds completely?" | Reducing 'everyone' to 'evryone' eliminates the unstressed middle syllable, a very common phonetic reduction that sounds natural in spoken dialogue. | {
"op": "replace",
"original": "everyone",
"perturbed": "evryone",
"position": 27
} | Finding his car ... broad daylight? Has [everyone -> evryone] lost their minds completely?" | done | null | /ˈɛv.ɹi.wʌn/ |
emergent-tts-eval_0004__word_boundary | emergent-tts-eval_0004 | emergent-tts-eval | Finding his car window smashed in the parking lot, Omar's face contorted with outrage as he shouted, "Who would do something like this in broad daylight? Has everyone lost their minds completely?" | 32 | intelligibility | word_boundary | Finding his car window smashed in the parking lot, Omar's face contorted without rage as he shouted, "Who would do something like this in broad daylight? Has everyone lost their minds completely?" | Shifted word boundary from 'with outrage' to 'without rage'. In continuous spoken speech, /wɪðˈaʊtreɪdʒ/ and /wɪðˈaʊt reɪdʒ/ produce virtually identical sound streams, making the shift difficult to catch without reading along. | {
"op": "replace",
"original": "with outrage",
"perturbed": "without rage",
"position": 12
} | Finding his car ... Omar's face contorted [with outrage -> without rage] as he shouted, ... their minds completely?" | done | null | /wɪðˈaʊt reɪdʒ/ |
emergent-tts-eval_0004__stress_shift | emergent-tts-eval_0004 | emergent-tts-eval | Finding his car window smashed in the parking lot, Omar's face contorted with outrage as he shouted, "Who would do something like this in broad daylight? Has everyone lost their minds completely?" | 32 | intelligibility | stress_shift | null | No heteronym present in the sentence to apply stress shift. | null | null | not_applicable | [
"model returned null (category not applicable)"
] | null |
emergent-tts-eval_0005__substitution | emergent-tts-eval_0005 | emergent-tts-eval | It felt like pure "yuanfen" that I found an authentic phone amidst rows of "shanzhai" electronics in the midnight market. | 20 | hallucination | substitution | It felt like pure "yuanfen" that I found an authentic phone amidst rows of "shanzhai" electronics in the midday market. | Replaced 'midnight' with 'midday'. Both share the 'mid-' prefix and fit naturally into the noun phrase 'market', making the swap easy to overlook upon a casual listen while shifting the timeframe. | {
"op": "replace",
"original": "midnight",
"perturbed": "midday",
"position": 18
} | It felt like ... electronics in the [midnight -> midday] market. | done | null | null |
emergent-tts-eval_0005__deletion | emergent-tts-eval_0005 | emergent-tts-eval | It felt like pure "yuanfen" that I found an authentic phone amidst rows of "shanzhai" electronics in the midnight market. | 20 | hallucination | deletion | It felt like pure "yuanfen" that I found an authentic phone amidst rows of electronics in the midnight market. | Deleting "shanzhai" removes the contrast between counterfeit and authentic goods that justifies the feeling of 'yuanfen', yet the sentence remains entirely fluent. | {
"op": "delete",
"original": "\"shanzhai\"",
"perturbed": "",
"position": 14
} | It felt like ... amidst rows of [-"shanzhai"] electronics in the midnight market. | done | null | null |
emergent-tts-eval_0005__insertion | emergent-tts-eval_0005 | emergent-tts-eval | It felt like pure "yuanfen" that I found an authentic phone amidst rows of "shanzhai" electronics in the midnight market. | 20 | hallucination | insertion | It felt like pure "yuanfen" that I finally found an authentic phone amidst rows of "shanzhai" electronics in the midnight market. | Adding 'finally' introduces a narrative arc of struggle or relief without breaking sentence flow or rhythm. | {
"op": "insert",
"original": "",
"perturbed": "finally",
"position": 7
} | It felt like ... "yuanfen" that I [+finally] found an authentic ... the midnight market. | done | null | null |
emergent-tts-eval_0005__repetition | emergent-tts-eval_0005 | emergent-tts-eval | It felt like pure "yuanfen" that I found an authentic phone amidst rows of "shanzhai" electronics in the midnight market. | 20 | hallucination | repetition | It felt like pure "yuanfen" that I found an authentic phone amidst rows of rows of "shanzhai" electronics in the midnight market. | Repeating 'rows of' creates 'rows of rows of', which closely mirrors the natural English idiom 'rows upon rows of' and is easily glossed over by a casual listener. | {
"op": "insert",
"original": "",
"perturbed": "rows of",
"position": 14
} | It felt like ... amidst rows of [+rows of] "shanzhai" electronics in the midnight market. | done | null | null |
emergent-tts-eval_0005__truncation | emergent-tts-eval_0005 | emergent-tts-eval | It felt like pure "yuanfen" that I found an authentic phone amidst rows of "shanzhai" electronics in the midnight market. | 20 | hallucination | truncation | It felt like pure "yuanfen" that I found an authentic phone amidst rows of "shanzhai" electronics. | Removing the prepositional phrase 'in the midnight market' leaves a grammatically complete and natural sentence ending on 'electronics'. | {
"op": "replace",
"original": "electronics in the midnight market.",
"perturbed": "electronics.",
"position": 15
} | It felt like ... rows of "shanzhai" [electronics in the midnight market. -> electronics.] | done | null | null |
emergent-tts-eval_0005__reordering | emergent-tts-eval_0005 | emergent-tts-eval | It felt like pure "yuanfen" that I found an authentic phone amidst rows of "shanzhai" electronics in the midnight market. | 20 | hallucination | reordering | It felt like pure "yuanfen" that I found an authentic phone in the midnight market amidst rows of "shanzhai" electronics. | Moving the prepositional phrase 'in the midnight market' earlier in the clause maintains natural syntax and cadence, making the shift imperceptible without side-by-side transcript comparison. | [
{
"op": "insert",
"original": "",
"perturbed": "in the midnight market",
"position": 11
},
{
"op": "replace",
"original": "electronics in the midnight market.",
"perturbed": "electronics.",
"position": 15
}
] | It felt like ... an authentic phone [+in the midnight market] amidst rows of "shanzhai" [electronics in the midnight market. -> electronics.] | done | null | null |
emergent-tts-eval_0005__mispronunciation | emergent-tts-eval_0005 | emergent-tts-eval | It felt like pure "yuanfen" that I found an authentic phone amidst rows of "shanzhai" electronics in the midnight market. | 20 | intelligibility | mispronunciation | It felt like pure "yuanfen" that I found an autentic phone amidst rows of "shanzhai" electronics in the midnight market. | Dropping the 'h' in 'authentic' causes TTS to render a hard /t/ instead of /θ/, creating a subtle mispronunciation easily missed on casual listening. | {
"op": "replace",
"original": "authentic",
"perturbed": "autentic",
"position": 9
} | It felt like ... I found an [authentic -> autentic] phone amidst rows ... the midnight market. | done | null | /ɔːˈtɛntɪk/ |
emergent-tts-eval_0005__syllable_drop | emergent-tts-eval_0005 | emergent-tts-eval | It felt like pure "yuanfen" that I found an authentic phone amidst rows of "shanzhai" electronics in the midnight market. | 20 | intelligibility | syllable_drop | null | No suitable multisyllabic word with an unstressed middle vowel before a liquid or nasal consonant exists in this sentence for natural syncope. | null | null | not_applicable | [
"model returned null (category not applicable)"
] | null |
emergent-tts-eval_0005__word_boundary | emergent-tts-eval_0005 | emergent-tts-eval | It felt like pure "yuanfen" that I found an authentic phone amidst rows of "shanzhai" electronics in the midnight market. | 20 | intelligibility | word_boundary | It felt like pure "yuanfen" that I found a nauthentic phone amidst rows of "shanzhai" electronics in the midnight market. | The trailing 'n' from the article 'an' migrates to the initial vowel of 'authentic', yielding 'a nauthentic' with an virtually identical acoustic stream. | {
"op": "replace",
"original": "an authentic",
"perturbed": "a nauthentic",
"position": 8
} | It felt like ... that I found [an authentic -> a nauthentic] phone amidst rows ... the midnight market. | done | null | /ə nɔːˈθɛntɪk/ |
emergent-tts-eval_0005__stress_shift | emergent-tts-eval_0005 | emergent-tts-eval | It felt like pure "yuanfen" that I found an authentic phone amidst rows of "shanzhai" electronics in the midnight market. | 20 | intelligibility | stress_shift | null | No heteronym present in the sentence to apply stress shift. | null | null | not_applicable | [
"model returned null (category not applicable)"
] | null |
emergent-tts-eval_0006__substitution | emergent-tts-eval_0006 | emergent-tts-eval | During Anthony's wanderlust-filled travels, he discovered the gemütlich atmosphere of many Austrian villages. | 13 | hallucination | substitution | During Anthony's wanderlust-filled travels, he discovered the gemütlich atmosphere of many Australian villages. | Replaced 'Austrian' with 'Australian'. The two words are visually and phonetically very similar, but alter the geographic context completely. | {
"op": "replace",
"original": "Austrian",
"perturbed": "Australian",
"position": 11
} | During Anthony's wanderlust-filled ... atmosphere of many [Austrian -> Australian] villages. | done | null | null |
emergent-tts-eval_0006__deletion | emergent-tts-eval_0006 | emergent-tts-eval | During Anthony's wanderlust-filled travels, he discovered the gemütlich atmosphere of many Austrian villages. | 13 | hallucination | deletion | During Anthony's wanderlust-filled travels, he discovered the gemütlich atmosphere of many villages. | Deleting "Austrian" silently removes the specific national setting while maintaining flawless grammar and rhythm. | {
"op": "delete",
"original": "Austrian",
"perturbed": "",
"position": 11
} | During Anthony's wanderlust-filled ... atmosphere of many [-Austrian] villages. | done | null | null |
emergent-tts-eval_0006__insertion | emergent-tts-eval_0006 | emergent-tts-eval | During Anthony's wanderlust-filled travels, he discovered the gemütlich atmosphere of many Austrian villages. | 13 | hallucination | insertion | During Anthony's wanderlust-filled travels, he first discovered the gemütlich atmosphere of many Austrian villages. | Inserting 'first' subtly alters the timeline of discovery, fitting seamlessly into the sentence structure. | {
"op": "insert",
"original": "",
"perturbed": "first",
"position": 5
} | During Anthony's wanderlust-filled travels, he [+first] discovered the gemütlich ... many Austrian villages. | done | null | null |
emergent-tts-eval_0006__repetition | emergent-tts-eval_0006 | emergent-tts-eval | During Anthony's wanderlust-filled travels, he discovered the gemütlich atmosphere of many Austrian villages. | 13 | hallucination | repetition | During Anthony's wanderlust-filled travels, he discovered the gemütlich atmosphere of many many Austrian villages. | Repeating 'many' creates a common conversational emphasis ('many many') that sounds natural in spoken speech. | {
"op": "insert",
"original": "",
"perturbed": "many",
"position": 11
} | During Anthony's wanderlust-filled ... atmosphere of many [+many] Austrian villages. | done | null | null |
emergent-tts-eval_0006__truncation | emergent-tts-eval_0006 | emergent-tts-eval | During Anthony's wanderlust-filled travels, he discovered the gemütlich atmosphere of many Austrian villages. | 13 | hallucination | truncation | During Anthony's wanderlust-filled travels, he discovered the gemütlich atmosphere. | Truncating 'of many Austrian villages' leaves a complete independent clause that sounds entirely whole without prior context. | {
"op": "replace",
"original": "atmosphere of many Austrian villages.",
"perturbed": "atmosphere.",
"position": 8
} | During Anthony's wanderlust-filled ... discovered the gemütlich [atmosphere of many Austrian villages. -> atmosphere.] | done | null | null |
emergent-tts-eval_0006__reordering | emergent-tts-eval_0006 | emergent-tts-eval | During Anthony's wanderlust-filled travels, he discovered the gemütlich atmosphere of many Austrian villages. | 13 | hallucination | reordering | During Anthony's wanderlust-filled travels, he discovered the atmosphere of many gemütlich Austrian villages. | Shifting 'gemütlich' to modify 'Austrian villages' instead of 'atmosphere' preserves grammatical fluency and identical vocabulary, allowing casual listeners to accept it without notice. | [
{
"op": "delete",
"original": "gemütlich",
"perturbed": "",
"position": 7
},
{
"op": "insert",
"original": "",
"perturbed": "gemütlich",
"position": 11
}
] | During Anthony's wanderlust-filled ... he discovered the [-gemütlich] atmosphere of many [+gemütlich] Austrian villages. | done | null | null |
emergent-tts-eval_0006__mispronunciation | emergent-tts-eval_0006 | emergent-tts-eval | During Anthony's wanderlust-filled travels, he discovered the gemütlich atmosphere of many Austrian villages. | 13 | intelligibility | mispronunciation | During Anthony's wanderlust-filled travels, he discovered the gemütlich atmospere of many Austrian villages. | Changing 'ph' to 'p' forces the TTS to pronounce a stop consonant /p/ instead of the fricative /f/, sounding like a slight speech error. | {
"op": "replace",
"original": "atmosphere",
"perturbed": "atmospere",
"position": 8
} | During Anthony's wanderlust-filled ... discovered the gemütlich [atmosphere -> atmospere] of many Austrian villages. | done | null | /ˈæt.mə.spɪər/ |
emergent-tts-eval_0006__syllable_drop | emergent-tts-eval_0006 | emergent-tts-eval | During Anthony's wanderlust-filled travels, he discovered the gemütlich atmosphere of many Austrian villages. | 13 | intelligibility | syllable_drop | During Anthony's wanderlust-filled travels, he discovred the gemütlich atmosphere of many Austrian villages. | The unstressed middle vowel in 'discovered' is dropped to create 'discovred', which reflects standard conversational syncope and is difficult to spot in fast speech. | {
"op": "replace",
"original": "discovered",
"perturbed": "discovred",
"position": 5
} | During Anthony's wanderlust-filled travels, he [discovered -> discovred] the gemütlich atmosphere ... many Austrian villages. | done | null | /dɪˈskʌvɹd/ |
emergent-tts-eval_0006__word_boundary | emergent-tts-eval_0006 | emergent-tts-eval | During Anthony's wanderlust-filled travels, he discovered the gemütlich atmosphere of many Austrian villages. | 13 | intelligibility | word_boundary | null | No viable word boundary shift exists among the word pairs in this sentence. | null | null | not_applicable | [
"model returned null (category not applicable)"
] | null |
emergent-tts-eval_0006__stress_shift | emergent-tts-eval_0006 | emergent-tts-eval | During Anthony's wanderlust-filled travels, he discovered the gemütlich atmosphere of many Austrian villages. | 13 | intelligibility | stress_shift | null | No heteronym present in the sentence to apply a stress shift. | null | null | not_applicable | [
"model returned null (category not applicable)"
] | null |
emergent-tts-eval_0007__substitution | emergent-tts-eval_0007 | emergent-tts-eval | It felt like pure yuanfen finding an authentic phone amidst rows of ge zhong ge yang de shanzhai electronics in the midnight market. | 23 | hallucination | substitution | It felt like pure yuanfen finding an antique phone amidst rows of ge zhong ge yang de shanzhai electronics in the midnight market. | Replaced 'authentic' with 'antique'. Both start with 'a' and fit naturally in context with 'phone' and 'market', but change the meaning from genuine to old. | {
"op": "replace",
"original": "authentic",
"perturbed": "antique",
"position": 7
} | It felt like ... yuanfen finding an [authentic -> antique] phone amidst rows ... the midnight market. | done | null | null |
emergent-tts-eval_0007__deletion | emergent-tts-eval_0007 | emergent-tts-eval | It felt like pure yuanfen finding an authentic phone amidst rows of ge zhong ge yang de shanzhai electronics in the midnight market. | 23 | hallucination | deletion | It felt like pure yuanfen finding an authentic phone amidst rows of shanzhai electronics in the midnight market. | Deleting "ge zhong ge yang de" removes the detail indicating a vast variety of electronics, which a casual listener would not catch without comparison. | {
"op": "delete",
"original": "ge zhong ge yang de",
"perturbed": "",
"position": 12
} | It felt like ... amidst rows of [-ge zhong ge yang de] shanzhai electronics in the midnight market. | done | null | null |
emergent-tts-eval_0007__insertion | emergent-tts-eval_0007 | emergent-tts-eval | It felt like pure yuanfen finding an authentic phone amidst rows of ge zhong ge yang de shanzhai electronics in the midnight market. | 23 | hallucination | insertion | It felt like pure yuanfen just finding an authentic phone amidst rows of ge zhong ge yang de shanzhai electronics in the midnight market. | Inserting 'just' functions as a subtle discourse modifier that changes the tone while remaining naturally integrated. | {
"op": "insert",
"original": "",
"perturbed": "just",
"position": 5
} | It felt like pure yuanfen [+just] finding an authentic ... the midnight market. | done | null | null |
emergent-tts-eval_0007__repetition | emergent-tts-eval_0007 | emergent-tts-eval | It felt like pure yuanfen finding an authentic phone amidst rows of ge zhong ge yang de shanzhai electronics in the midnight market. | 23 | hallucination | repetition | It felt like pure yuanfen finding an authentic phone amidst rows of ge zhong ge yang de shanzhai electronics in the in the midnight market. | A duplicated function phrase 'in the in the' mimics a quick speech stutter or common TTS glitch that the human brain automatically filters out. | {
"op": "insert",
"original": "",
"perturbed": "in the",
"position": 21
} | It felt like ... electronics in the [+in the] midnight market. | done | null | null |
emergent-tts-eval_0007__truncation | emergent-tts-eval_0007 | emergent-tts-eval | It felt like pure yuanfen finding an authentic phone amidst rows of ge zhong ge yang de shanzhai electronics in the midnight market. | 23 | hallucination | truncation | It felt like pure yuanfen finding an authentic phone amidst rows of ge zhong ge yang de shanzhai electronics. | Dropping 'in the midnight market' creates a self-contained sentence where the list of electronics feels like a natural stopping point. | {
"op": "replace",
"original": "electronics in the midnight market.",
"perturbed": "electronics.",
"position": 18
} | It felt like ... yang de shanzhai [electronics in the midnight market. -> electronics.] | done | null | null |
emergent-tts-eval_0007__reordering | emergent-tts-eval_0007 | emergent-tts-eval | It felt like pure yuanfen finding an authentic phone amidst rows of ge zhong ge yang de shanzhai electronics in the midnight market. | 23 | hallucination | reordering | It felt like pure yuanfen finding an authentic phone in the midnight market amidst rows of ge zhong ge yang de shanzhai electronics. | Positioning 'in the midnight market' directly after 'an authentic phone' creates a smooth prepositional sequence that sounds completely natural in spoken English. | [
{
"op": "insert",
"original": "",
"perturbed": "in the midnight market",
"position": 9
},
{
"op": "replace",
"original": "electronics in the midnight market.",
"perturbed": "electronics.",
"position": 18
}
] | It felt like ... an authentic phone [+in the midnight market] amidst rows of ... yang de shanzhai [electronics in the midnight market. -> electronics.] | done | null | null |
emergent-tts-eval_0007__mispronunciation | emergent-tts-eval_0007 | emergent-tts-eval | It felt like pure yuanfen finding an authentic phone amidst rows of ge zhong ge yang de shanzhai electronics in the midnight market. | 23 | intelligibility | mispronunciation | It felt like pure yuanfen finding an authentic phone amidest rows of ge zhong ge yang de shanzhai electronics in the midnight market. | Inserting an 'e' into 'amidst' adds an extra unstressed vowel syllable /ɪ/, causing a subtle rhythmic hiccup in speech synthesis. | {
"op": "replace",
"original": "amidst",
"perturbed": "amidest",
"position": 9
} | It felt like ... an authentic phone [amidst -> amidest] rows of ge ... the midnight market. | done | null | /əˈmɪdɪst/ |
emergent-tts-eval_0007__syllable_drop | emergent-tts-eval_0007 | emergent-tts-eval | It felt like pure yuanfen finding an authentic phone amidst rows of ge zhong ge yang de shanzhai electronics in the midnight market. | 23 | intelligibility | syllable_drop | null | No suitable multisyllabic word with an unstressed middle vowel before a liquid or nasal consonant exists in this sentence for natural syncope. | null | null | not_applicable | [
"model returned null (category not applicable)"
] | null |
emergent-tts-eval_0007__word_boundary | emergent-tts-eval_0007 | emergent-tts-eval | It felt like pure yuanfen finding an authentic phone amidst rows of ge zhong ge yang de shanzhai electronics in the midnight market. | 23 | intelligibility | word_boundary | It felt like pure yuanfen finding a nauthentic phone amidst rows of ge zhong ge yang de shanzhai electronics in the midnight market. | The boundary between 'an' and 'authentic' shifts right to 'a nauthentic', preserving the original acoustic phonetic sequence. | {
"op": "replace",
"original": "an authentic",
"perturbed": "a nauthentic",
"position": 6
} | It felt like pure yuanfen finding [an authentic -> a nauthentic] phone amidst rows ... the midnight market. | done | null | /ə nɔːˈθɛntɪk/ |
emergent-tts-eval_0007__stress_shift | emergent-tts-eval_0007 | emergent-tts-eval | It felt like pure yuanfen finding an authentic phone amidst rows of ge zhong ge yang de shanzhai electronics in the midnight market. | 23 | intelligibility | stress_shift | null | No heteronym present in the sentence to apply a stress shift. | null | null | not_applicable | [
"model returned null (category not applicable)"
] | null |
emergent-tts-eval_0008__substitution | emergent-tts-eval_0008 | emergent-tts-eval | During the dawn "parikrama" around the lake, the monk spoke of his austere years at the ancient "gurukul" hidden in the foothills. | 22 | hallucination | substitution | During the dusk "parikrama" around the lake, the monk spoke of his austere years at the ancient "gurukul" hidden in the foothills. | Replaced 'dawn' with 'dusk'. Both are short single-syllable time-of-day nouns starting with 'd', smoothly altering the temporal setting without disrupting sentence rhythm. | {
"op": "replace",
"original": "dawn",
"perturbed": "dusk",
"position": 2
} | During the [dawn -> dusk] "parikrama" around the ... in the foothills. | done | null | null |
emergent-tts-eval_0008__deletion | emergent-tts-eval_0008 | emergent-tts-eval | During the dawn "parikrama" around the lake, the monk spoke of his austere years at the ancient "gurukul" hidden in the foothills. | 22 | hallucination | deletion | During the dawn "parikrama" around the lake, the monk spoke of his years at the ancient "gurukul" hidden in the foothills. | Deleting "austere" omits the key descriptor of the monk's rigorous lifestyle while leaving the surrounding sentence structurally undisturbed. | {
"op": "delete",
"original": "austere",
"perturbed": "",
"position": 12
} | During the dawn ... spoke of his [-austere] years at the ... in the foothills. | done | null | null |
emergent-tts-eval_0008__insertion | emergent-tts-eval_0008 | emergent-tts-eval | During the dawn "parikrama" around the lake, the monk spoke of his austere years at the ancient "gurukul" hidden in the foothills. | 22 | hallucination | insertion | During the dawn "parikrama" around the lake, the monk quietly spoke of his austere years at the ancient "gurukul" hidden in the foothills. | Adding 'quietly' enhances the peaceful tone of the sentence, making it blend in naturally while altering the descriptive detail. | {
"op": "insert",
"original": "",
"perturbed": "quietly",
"position": 9
} | During the dawn ... lake, the monk [+quietly] spoke of his ... in the foothills. | done | null | null |
emergent-tts-eval_0008__repetition | emergent-tts-eval_0008 | emergent-tts-eval | During the dawn "parikrama" around the lake, the monk spoke of his austere years at the ancient "gurukul" hidden in the foothills. | 22 | hallucination | repetition | During the dawn "parikrama" around the lake, the monk spoke of his austere years at the ancient "gurukul" hidden in the in the foothills. | Repeating 'in the' near the end of the sentence functions as a subtle hesitation that listeners naturally ignore. | {
"op": "insert",
"original": "",
"perturbed": "in the",
"position": 21
} | During the dawn ... hidden in the [+in the] foothills. | done | null | null |
emergent-tts-eval_0008__truncation | emergent-tts-eval_0008 | emergent-tts-eval | During the dawn "parikrama" around the lake, the monk spoke of his austere years at the ancient "gurukul" hidden in the foothills. | 22 | hallucination | truncation | During the dawn "parikrama" around the lake, the monk spoke of his austere years at the ancient "gurukul". | Ending at 'ancient "gurukul"' omits only the final participial phrase 'hidden in the foothills', leaving the sentence grammatically complete. | {
"op": "replace",
"original": "\"gurukul\" hidden in the foothills.",
"perturbed": "\"gurukul\".",
"position": 17
} | During the dawn ... at the ancient ["gurukul" hidden in the foothills. -> "gurukul".] | done | null | null |
emergent-tts-eval_0008__reordering | emergent-tts-eval_0008 | emergent-tts-eval | During the dawn "parikrama" around the lake, the monk spoke of his austere years at the ancient "gurukul" hidden in the foothills. | 22 | hallucination | reordering | During the dawn "parikrama" around the lake, the monk spoke of his austere years hidden in the foothills at the ancient "gurukul". | Swapping the order of 'hidden in the foothills' and 'at the ancient gurukul' produces a coherent and fluid closing clause that listeners will not spot as altered. | [
{
"op": "insert",
"original": "",
"perturbed": "hidden in the foothills",
"position": 14
},
{
"op": "replace",
"original": "\"gurukul\" hidden in the foothills.",
"perturbed": "\"gurukul\".",
"position": 17
}
] | During the dawn ... his austere years [+hidden in the foothills] at the ancient ["gurukul" hidden in the foothills. -> "gurukul".] | done | null | null |
emergent-tts-eval_0008__mispronunciation | emergent-tts-eval_0008 | emergent-tts-eval | During the dawn "parikrama" around the lake, the monk spoke of his austere years at the ancient "gurukul" hidden in the foothills. | 22 | intelligibility | mispronunciation | During the dawn "parikrama" around the lake, the monk spoke of his austere years at the ancient "gurukul" hidden in the foodhills. | Changing 't' to 'd' shifts the unvoiced stop /t/ to a voiced /d/, mimicking natural consonant flapping that flows smoothly in casual listening. | {
"op": "replace",
"original": "foothills.",
"perturbed": "foodhills.",
"position": 21
} | During the dawn ... hidden in the [foothills. -> foodhills.] | done | null | /ˈfʊdˌhɪlz/ |
emergent-tts-eval_0008__syllable_drop | emergent-tts-eval_0008 | emergent-tts-eval | During the dawn "parikrama" around the lake, the monk spoke of his austere years at the ancient "gurukul" hidden in the foothills. | 22 | intelligibility | syllable_drop | null | No suitable multisyllabic word with an unstressed middle vowel targetable for natural syncope exists in this sentence. | null | null | not_applicable | [
"model returned null (category not applicable)"
] | null |
emergent-tts-eval_0008__word_boundary | emergent-tts-eval_0008 | emergent-tts-eval | During the dawn "parikrama" around the lake, the monk spoke of his austere years at the ancient "gurukul" hidden in the foothills. | 22 | intelligibility | word_boundary | During the dawn "parikrama" around the lake, the monks poke of his austere years at the ancient "gurukul" hidden in the foothills. | Shifting the /s/ sound from the beginning of 'spoke' to the end of 'monk' creates 'monks poke', which sounds nearly identical in continuous speech. | {
"op": "replace",
"original": "monk spoke",
"perturbed": "monks poke",
"position": 8
} | During the dawn ... the lake, the [monk spoke -> monks poke] of his austere ... in the foothills. | done | null | /ðə mʌŋks poʊk/ |
emergent-tts-eval_0008__stress_shift | emergent-tts-eval_0008 | emergent-tts-eval | During the dawn "parikrama" around the lake, the monk spoke of his austere years at the ancient "gurukul" hidden in the foothills. | 22 | intelligibility | stress_shift | null | No heteronym present in the sentence to apply a stress shift. | null | null | not_applicable | [
"model returned null (category not applicable)"
] | null |
emergent-tts-eval_0009__substitution | emergent-tts-eval_0009 | emergent-tts-eval | The master from Osaka, Japan, dedicated himself to crafting the perfect "nigiri," with "umami" flavors dancing on the palate. | 19 | hallucination | substitution | The master from Okinawa, Japan, dedicated himself to crafting the perfect "nigiri," with "umami" flavors dancing on the palate. | Replaced 'Osaka' with 'Okinawa'. Both are major Japanese locations starting with 'O', preserving syntactic structure while altering the origin city. | {
"op": "replace",
"original": "Osaka,",
"perturbed": "Okinawa,",
"position": 3
} | The master from [Osaka, -> Okinawa,] Japan, dedicated himself ... on the palate. | done | null | null |
emergent-tts-eval_0009__deletion | emergent-tts-eval_0009 | emergent-tts-eval | The master from Osaka, Japan, dedicated himself to crafting the perfect "nigiri," with "umami" flavors dancing on the palate. | 19 | hallucination | deletion | The master from Osaka, Japan, dedicated himself to crafting the perfect "nigiri," with flavors dancing on the palate. | Deleting "umami" removes the specific flavor profile description, reducing it to a generic statement that sounds entirely natural. | {
"op": "delete",
"original": "\"umami\"",
"perturbed": "",
"position": 13
} | The master from ... perfect "nigiri," with [-"umami"] flavors dancing on the palate. | done | null | null |
emergent-tts-eval_0009__insertion | emergent-tts-eval_0009 | emergent-tts-eval | The master from Osaka, Japan, dedicated himself to crafting the perfect "nigiri," with "umami" flavors dancing on the palate. | 19 | hallucination | insertion | The master from Osaka, Japan, always dedicated himself to crafting the perfect "nigiri," with "umami" flavors dancing on the palate. | Inserting 'always' shifts the action from a specific dedication to a habitual state, easily missed during fluent speech. | {
"op": "insert",
"original": "",
"perturbed": "always",
"position": 5
} | The master from Osaka, Japan, [+always] dedicated himself to ... on the palate. | done | null | null |
emergent-tts-eval_0009__repetition | emergent-tts-eval_0009 | emergent-tts-eval | The master from Osaka, Japan, dedicated himself to crafting the perfect "nigiri," with "umami" flavors dancing on the palate. | 19 | hallucination | repetition | The master from Osaka, Japan, dedicated himself to crafting the perfect perfect "nigiri," with "umami" flavors dancing on the palate. | Repeating 'perfect' acts as natural spoken emphasis for descriptor quality, blending seamlessly into the sentence. | {
"op": "insert",
"original": "",
"perturbed": "perfect",
"position": 11
} | The master from ... crafting the perfect [+perfect] "nigiri," with "umami" ... on the palate. | done | null | null |
emergent-tts-eval_0009__truncation | emergent-tts-eval_0009 | emergent-tts-eval | The master from Osaka, Japan, dedicated himself to crafting the perfect "nigiri," with "umami" flavors dancing on the palate. | 19 | hallucination | truncation | The master from Osaka, Japan, dedicated himself to crafting the perfect "nigiri." | Dropping the trailing clause 'with "umami" flavors dancing on the palate' leaves a concise, complete statement. | {
"op": "replace",
"original": "\"nigiri,\" with \"umami\" flavors dancing on the palate.",
"perturbed": "\"nigiri.\"",
"position": 11
} | The master from ... crafting the perfect ["nigiri," with "umami" flavors dancing on the palate. -> "nigiri."] | done | null | null |
emergent-tts-eval_0009__reordering | emergent-tts-eval_0009 | emergent-tts-eval | The master from Osaka, Japan, dedicated himself to crafting the perfect "nigiri," with "umami" flavors dancing on the palate. | 19 | hallucination | reordering | The master from Osaka, Japan, dedicated himself to crafting the perfect "nigiri," with dancing "umami" flavors on the palate. | Moving 'dancing' from a post-nominal modifier to a pre-nominal adjective phrase ('dancing umami flavors') keeps the sentence grammatical and effortless to hear. | [
{
"op": "insert",
"original": "",
"perturbed": "dancing",
"position": 13
},
{
"op": "delete",
"original": "dancing",
"perturbed": "",
"position": 15
}
] | The master from ... perfect "nigiri," with [+dancing] "umami" flavors [-dancing] on the palate. | done | null | null |
emergent-tts-eval_0009__mispronunciation | emergent-tts-eval_0009 | emergent-tts-eval | The master from Osaka, Japan, dedicated himself to crafting the perfect "nigiri," with "umami" flavors dancing on the palate. | 19 | intelligibility | mispronunciation | The master from Osaka, Japan, dedicated himself to crafting the perfect "niguri," with "umami" flavors dancing on the palate. | Replacing the second 'i' with 'u' in 'nigiri' causes TTS to pronounce /ʊ/ instead of /iː/, a minor foreign vowel shift that readers or listeners easily overlook. | {
"op": "replace",
"original": "\"nigiri,\"",
"perturbed": "\"niguri,\"",
"position": 11
} | The master from ... crafting the perfect ["nigiri," -> "niguri,"] with "umami" flavors ... on the palate. | done | null | /nɪˈɡʊri/ |
emergent-tts-eval_0009__syllable_drop | emergent-tts-eval_0009 | emergent-tts-eval | The master from Osaka, Japan, dedicated himself to crafting the perfect "nigiri," with "umami" flavors dancing on the palate. | 19 | intelligibility | syllable_drop | null | No suitable multisyllabic word with an unstressed middle vowel targetable for natural syncope exists in this sentence. | null | null | not_applicable | [
"model returned null (category not applicable)"
] | null |
emergent-tts-eval_0009__word_boundary | emergent-tts-eval_0009 | emergent-tts-eval | The master from Osaka, Japan, dedicated himself to crafting the perfect "nigiri," with "umami" flavors dancing on the palate. | 19 | intelligibility | word_boundary | null | No adjacent word pairs in this sentence allow a clean, phonetically equivalent word boundary shift. | null | null | not_applicable | [
"model returned null (category not applicable)"
] | null |
emergent-tts-eval_0009__stress_shift | emergent-tts-eval_0009 | emergent-tts-eval | The master from Osaka, Japan, dedicated himself to crafting the perfect "nigiri," with "umami" flavors dancing on the palate. | 19 | intelligibility | stress_shift | The master from Osaka, Japan, dedicated himself to crafting the per-fect "nigiri," with "umami" flavors dancing on the palate. | Shifted stress on 'perfect' from first-syllable noun/adjective stress (/ˈpɜːrfɪkt/) to second-syllable verb stress (/pərˈfɛkt/), which sounds slightly unnatural in context but is easily overlooked. | {
"op": "replace",
"original": "perfect",
"perturbed": "per-fect",
"position": 10
} | The master from ... to crafting the [perfect -> per-fect] "nigiri," with "umami" ... on the palate. | done | null | pərˈfɛkt |
End of preview. Expand in Data Studio
Audio Perturbation TTS Gold Sentences
A curated set of English sentences for perturbation-based blind-spot evaluation of audio-LLM judges on synthesised speech.
Overview
This dataset provides original (clean) sentences sampled from established TTS benchmarks. The sentences are designed to be fed through TTS models to generate clean audio (A_gold), then perturbed at the text level (S_gold → S_pert) and re-synthesised (A_pert) to test whether audio-LLM judges can detect the injected errors.
Sentences are chosen to stress-test specific linguistic phenomena (foreign words, numbers, dates, URLs, complex pronunciation, syntactic complexity, paralinguistics).
Source Benchmarks
| Benchmark | Samples | What it contributes |
|---|---|---|
| EmergentTTS-Eval | Hard categories: emotions, paralinguistics, foreign words, syntactic complexity, complex pronunciation, questions | |
| InstructTTSEval | Natural-language style instruction following; conversational and dramatic dialogue | |
| Seed-TTS-eval (EN) | Everyday English sentences from Common Voice; length and vocabulary variety | |
| MiniMaxAI/TTS-Multilingual-Test-Set | Natural sentences |
Schema
Each line in gold.jsonl is a JSON object:
{
"id": "emergent-tts-eval_0014",
"source_benchmark": "emergent-tts-eval",
"original_sentence": "The experiment demonstrated quantum entanglement...",
"perturbed_sentence": null,
"category_in_source": "Pronunciation",
"length_words": 25,
"phenomena": ["number", "decimal", "math_symbol"],
"perturbation_type": null,
"a_gold_path": null,
"a_pert_path": null
}
| Field | Type | Description |
|---|---|---|
id |
string | Unique identifier: {benchmark}_{index:04d} |
source_benchmark |
string | Which benchmark the sentence was sampled from |
original_sentence |
string | The gold sentence (S_gold) |
perturbed_sentence |
string | null | The perturbed sentence (S_pert) |
category_in_source |
string | null | The benchmark's own category label (e.g., "Emotions", "Numerics") |
length_words |
int | Word count |
phenomena |
list[string] | Auto-detected linguistic phenomena (regex-based) |
perturbation_type |
string | null | Which axis was perturbed (e.g., "hallucination", "mispronunciation") |
a_gold_path |
string | null | Path to gold audio |
a_pert_path |
string | null | Path to perturbed audio |
Phenomena Tags
Auto-detected via regex at sampling time:
number, currency, date, time, url, email, acronym, abbreviation, decimal, percentage, quote, question, exclamation, math_symbol, parenthetical, long_sentence
Perturbation Axes
- Hallucinations
- Intelligibility (mispronunciations)
- Expressiveness
- Speaker similarity
- Voice quality (human-likeness)
- Liveliness (monotone vs lively)
- Presence of noise
- Accent
- Instruction following
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