[
  {
    "id": "R3",
    "label": "Lock and judge answer",
    "preconditions": [
      {
        "type": "StatePredicate",
        "entity": "Locked",
        "attribute": "locked",
        "operator": "==",
        "value": false
      },
      {
        "type": "StatePredicate",
        "entity": "Phase",
        "attribute": "phase",
        "operator": "==",
        "value": "SecondSymbolDisplay"
      }
    ],
    "trigger": {
      "type": "Event",
      "name": "AnswerKeyDown"
    },
    "effects": [
      {
        "type": "StateUpdate",
        "entity": "ComparisonTrial",
        "attribute": "lockedKey",
        "operator": "SET",
        "value": {
          "kind": "opaque",
          "description": "the key of this answer press, locked as the trial's answer: F (Same) or J (Different); in Gameplay gamepad X or LB counts as F, and RB or B counts as J"
        }
      },
      {
        "type": "StateUpdate",
        "entity": "Locked",
        "attribute": "locked",
        "operator": "SET",
        "value": true
      },
      {
        "type": "StateUpdate",
        "entity": "ComparisonTrial",
        "attribute": "rtMs",
        "operator": "SET",
        "value": {
          "kind": "opaque",
          "description": "round((time of this answer press − PH-B onset) × 1000): the response time in integer milliseconds"
        }
      },
      {
        "type": "EventEmission",
        "name": "AnswerLocked"
      }
    ],
    "provenance": {
      "mechanic": "R3",
      "gdd_quote": "  | R3 | phase = `PH-B`, key ∈ {`F`,`J`}, not yet locked | lock answer = key; record RT = round((now − `PH-B` onset) × 1000) ms; resolve correctness via `RT-JUDGE`; end `PH-B` immediately; enter `PH-FB` |",
      "precondition": "phase = `PH-B`, key ∈ {`F`,`J`}, not yet locked",
      "action": "Apply R3 under the stated condition and trigger.",
      "expected": "lock answer = key; record RT = round((now − `PH-B` onset) × 1000) ms; resolve correctness via `RT-JUDGE`; end `PH-B` immediately; enter `PH-FB`",
      "evidence": "Observe the listed state changes and emitted cue events.",
      "source": {
        "file": "gdds/small/same_or_shift.md",
        "line_start": 139,
        "line_end": 139,
        "quote": "  | R3 | phase = `PH-B`, key ∈ {`F`,`J`}, not yet locked | lock answer = key; record RT = round((now − `PH-B` onset) × 1000) ms; resolve correctness via `RT-JUDGE`; end `PH-B` immediately; enter `PH-FB` |"
      }
    }
  },
  {
    "id": "R1#2",
    "label": "Judge Same plus F correct",
    "preconditions": [
      {
        "type": "StatePredicate",
        "entity": "Type",
        "attribute": "type",
        "operator": "==",
        "value": "Same"
      },
      {
        "type": "StatePredicate",
        "entity": "ComparisonTrial",
        "attribute": "lockedKey",
        "operator": "==",
        "value": "F"
      }
    ],
    "trigger": {
      "type": "Event",
      "name": "AnswerLocked"
    },
    "effects": [
      {
        "type": "StateUpdate",
        "entity": "Correct",
        "attribute": "correct",
        "operator": "SET",
        "value": true
      }
    ],
    "provenance": {
      "mechanic": "R1#2",
      "gdd_quote": "  | R1 | trial type = `SAME`, key = `F` | **correct** |",
      "precondition": "trial type = `SAME`, key = `F`",
      "action": "Apply R1#2 under the stated condition and trigger.",
      "expected": "**correct** Table header: **`RT-JUDGE` — correctness of a locked answer.**",
      "evidence": "Observe the listed state changes and emitted cue events.",
      "source": {
        "file": "gdds/small/same_or_shift.md",
        "line_start": 148,
        "line_end": 148,
        "quote": "  | R1 | trial type = `SAME`, key = `F` | **correct** |"
      }
    }
  },
  {
    "id": "R2#2",
    "label": "Judge Same plus J incorrect",
    "preconditions": [
      {
        "type": "StatePredicate",
        "entity": "Type",
        "attribute": "type",
        "operator": "==",
        "value": "Same"
      },
      {
        "type": "StatePredicate",
        "entity": "ComparisonTrial",
        "attribute": "lockedKey",
        "operator": "==",
        "value": "J"
      }
    ],
    "trigger": {
      "type": "Event",
      "name": "AnswerLocked"
    },
    "effects": [
      {
        "type": "StateUpdate",
        "entity": "Correct",
        "attribute": "correct",
        "operator": "SET",
        "value": false
      }
    ],
    "provenance": {
      "mechanic": "R2#2",
      "gdd_quote": "  | R2 | trial type = `SAME`, key = `J` | **incorrect** |",
      "precondition": "trial type = `SAME`, key = `J`",
      "action": "Apply R2#2 under the stated condition and trigger.",
      "expected": "**incorrect** Table header: **`RT-JUDGE` — correctness of a locked answer.**",
      "evidence": "Observe the listed state changes and emitted cue events.",
      "source": {
        "file": "gdds/small/same_or_shift.md",
        "line_start": 149,
        "line_end": 149,
        "quote": "  | R2 | trial type = `SAME`, key = `J` | **incorrect** |"
      }
    }
  },
  {
    "id": "R3#2",
    "label": "Judge different plus F incorrect",
    "preconditions": [
      {
        "type": "StatePredicate",
        "entity": "Type",
        "attribute": "type",
        "operator": "IN",
        "value": [
          "DiffHard",
          "DiffEasy"
        ]
      },
      {
        "type": "StatePredicate",
        "entity": "ComparisonTrial",
        "attribute": "lockedKey",
        "operator": "==",
        "value": "F"
      }
    ],
    "trigger": {
      "type": "Event",
      "name": "AnswerLocked"
    },
    "effects": [
      {
        "type": "StateUpdate",
        "entity": "Correct",
        "attribute": "correct",
        "operator": "SET",
        "value": false
      }
    ],
    "provenance": {
      "mechanic": "R3#2",
      "gdd_quote": "  | R3 | trial type = `DIFF_HARD` or `DIFF_EASY`, key = `F` | **incorrect** |",
      "precondition": "trial type = `DIFF_HARD` or `DIFF_EASY`, key = `F`",
      "action": "Apply R3#2 under the stated condition and trigger.",
      "expected": "**incorrect** Table header: **`RT-JUDGE` — correctness of a locked answer.**",
      "evidence": "Observe the listed state changes and emitted cue events.",
      "source": {
        "file": "gdds/small/same_or_shift.md",
        "line_start": 150,
        "line_end": 150,
        "quote": "  | R3 | trial type = `DIFF_HARD` or `DIFF_EASY`, key = `F` | **incorrect** |"
      }
    }
  },
  {
    "id": "R4#2",
    "label": "Judge different plus J correct",
    "preconditions": [
      {
        "type": "StatePredicate",
        "entity": "Type",
        "attribute": "type",
        "operator": "IN",
        "value": [
          "DiffHard",
          "DiffEasy"
        ]
      },
      {
        "type": "StatePredicate",
        "entity": "ComparisonTrial",
        "attribute": "lockedKey",
        "operator": "==",
        "value": "J"
      }
    ],
    "trigger": {
      "type": "Event",
      "name": "AnswerLocked"
    },
    "effects": [
      {
        "type": "StateUpdate",
        "entity": "Correct",
        "attribute": "correct",
        "operator": "SET",
        "value": true
      }
    ],
    "provenance": {
      "mechanic": "R4#2",
      "gdd_quote": "  | R4 | trial type = `DIFF_HARD` or `DIFF_EASY`, key = `J` | **correct** |",
      "precondition": "trial type = `DIFF_HARD` or `DIFF_EASY`, key = `J`",
      "action": "Apply R4#2 under the stated condition and trigger.",
      "expected": "**correct** Table header: **`RT-JUDGE` — correctness of a locked answer.**",
      "evidence": "Observe the listed state changes and emitted cue events.",
      "source": {
        "file": "gdds/small/same_or_shift.md",
        "line_start": 151,
        "line_end": 151,
        "quote": "  | R4 | trial type = `DIFF_HARD` or `DIFF_EASY`, key = `J` | **correct** |"
      }
    }
  },
  {
    "id": "R1#3",
    "label": "Commit answered feedback",
    "preconditions": [
      {
        "type": "StatePredicate",
        "entity": "Locked",
        "attribute": "locked",
        "operator": "==",
        "value": true
      },
      {
        "type": "StatePredicate",
        "entity": "Phase",
        "attribute": "phase",
        "operator": "==",
        "value": "SecondSymbolDisplay"
      }
    ],
    "trigger": {
      "type": "Event",
      "name": "AnswerLocked"
    },
    "effects": [
      {
        "type": "StateUpdate",
        "entity": "Answered",
        "attribute": "answered",
        "operator": "SET",
        "value": true
      },
      {
        "type": "StateUpdate",
        "entity": "Correct",
        "attribute": "correct",
        "operator": "SET",
        "value": {
          "expr": "RT-JUDGE result"
        }
      },
      {
        "type": "StateUpdate",
        "entity": "Phase",
        "attribute": "phase",
        "operator": "SET",
        "value": "Feedback"
      },
      {
        "type": "StateUpdate",
        "entity": "Timeout",
        "attribute": "timeout",
        "operator": "SET",
        "value": false
      },
      {
        "type": "StateUpdate",
        "entity": "CorrectCount",
        "attribute": "correctCount",
        "operator": "INCREMENT",
        "value": {
          "kind": "opaque",
          "description": "1 when this answer is judged correct (correct = true), adding the trial's point to the session score once; 0 when it is judged incorrect"
        }
      },
      {
        "type": "StateUpdate",
        "entity": "Variant",
        "attribute": "variant",
        "operator": "SET",
        "value": {
          "kind": "opaque",
          "description": "Correct when correct = true; Incorrect when correct = false"
        }
      },
      {
        "type": "EventEmission",
        "name": "ComparisonTrialStreakUpdated"
      },
      {
        "type": "EventEmission",
        "name": "CorrectOrWrongSoundPlayed"
      }
    ],
    "provenance": {
      "mechanic": "R1#3",
      "gdd_quote": "  | R1 | answer locked during `PH-B` (`RT-INPUT` R3) | set `answered`=true, `timeout`=false, `correct`= `RT-JUDGE` result; feed Streak (`RT-STREAK`); play `SFX-CORRECT` if correct else `SFX-WRONG`; run `PH-FB` (feedback for that outcome) |",
      "precondition": "answer locked during `PH-B` (`RT-INPUT` R3)",
      "action": "Apply R1#3 under the stated condition and trigger.",
      "expected": "set `answered`=true, `timeout`=false, `correct`= `RT-JUDGE` result; feed Streak (`RT-STREAK`); play `SFX-CORRECT` if correct else `SFX-WRONG`; run `PH-FB` (feedback for that outcome) CorrectOrWrongSoundPlayed is SFX-CORRECT when correct = true and SFX-WRONG when correct = false, one cue per answered trial. Economy: Each trial contributes to session score: +1 correct on `RT-TRIAL` R1 when correct; otherwise no point (`RT-TRIAL` R1 incorrect / R2 timeout). Correctness Feedback: | Correct | R1 correct | ring pulse `COL-CORRECT`; symbol B tint→`COL-CORRECT` 60%; check glyph | `SFX-CORRECT` | | Incorrect | R1 incorrect | ring pulse `COL-WRONG`; symbol B tint→`COL-WRONG` 60%; horizontal shake; cross glyph | `SFX-WRONG` |",
      "evidence": "Observe the listed state changes and emitted cue events.",
      "source": {
        "file": "gdds/small/same_or_shift.md",
        "line_start": 157,
        "line_end": 157,
        "quote": "  | R1 | answer locked during `PH-B` (`RT-INPUT` R3) | set `answered`=true, `timeout`=false, `correct`= `RT-JUDGE` result; feed Streak (`RT-STREAK`); play `SFX-CORRECT` if correct else `SFX-WRONG`; run `PH-FB` (feedback for that outcome) |"
      }
    }
  },
  {
    "id": "R2#3",
    "label": "Commit timeout feedback",
    "preconditions": [
      {
        "type": "StatePredicate",
        "entity": "Locked",
        "attribute": "locked",
        "operator": "==",
        "value": false
      },
      {
        "type": "StatePredicate",
        "entity": "Phase",
        "attribute": "phase",
        "operator": "==",
        "value": "SecondSymbolDisplay"
      }
    ],
    "trigger": {
      "type": "Event",
      "name": "Timeout"
    },
    "effects": [
      {
        "type": "StateUpdate",
        "entity": "Answered",
        "attribute": "answered",
        "operator": "SET",
        "value": false
      },
      {
        "type": "StateUpdate",
        "entity": "Correct",
        "attribute": "correct",
        "operator": "SET",
        "value": false
      },
      {
        "type": "StateUpdate",
        "entity": "Phase",
        "attribute": "phase",
        "operator": "SET",
        "value": "Feedback"
      },
      {
        "type": "StateUpdate",
        "entity": "Timeout",
        "attribute": "timeout",
        "operator": "SET",
        "value": true
      },
      {
        "type": "StateUpdate",
        "entity": "ComparisonTrial",
        "attribute": "rtMs",
        "operator": "SET",
        "value": null
      },
      {
        "type": "StateUpdate",
        "entity": "Variant",
        "attribute": "variant",
        "operator": "SET",
        "value": "Timeout"
      },
      {
        "type": "EventEmission",
        "name": "ComparisonTrialStreakUpdated"
      },
      {
        "type": "EventEmission",
        "name": "TimeoutSoundPlayed"
      }
    ],
    "provenance": {
      "mechanic": "R2#3",
      "gdd_quote": "  | R2 | `PH-B` reaches 2.00 s (`DBT-7`) with no answer locked | set `answered`=false, `timeout`=true, `correct`=false, RT=none; feed Streak (`RT-STREAK`); play `SFX-TIMEOUT`; run `PH-FB` (timeout feedback) |",
      "precondition": "`PH-B` reaches 2.00 s (`DBT-7`) with no answer locked",
      "action": "Apply R2#3 under the stated condition and trigger.",
      "expected": "set `answered`=false, `timeout`=true, `correct`=false, RT=none; feed Streak (`RT-STREAK`); play `SFX-TIMEOUT`; run `PH-FB` (timeout feedback) Economy: Each trial contributes to session score: +1 correct on `RT-TRIAL` R1 when correct; otherwise no point (`RT-TRIAL` R1 incorrect / R2 timeout). Correctness Feedback: | Timeout | R2 | ring pulse `COL-TIMEOUT`; symbol B fades to 40% opacity + tint `COL-TIMEOUT`; dash glyph | `SFX-TIMEOUT` |",
      "evidence": "Observe the listed state changes and emitted cue events.",
      "source": {
        "file": "gdds/small/same_or_shift.md",
        "line_start": 158,
        "line_end": 158,
        "quote": "  | R2 | `PH-B` reaches 2.00 s (`DBT-7`) with no answer locked | set `answered`=false, `timeout`=true, `correct`=false, RT=none; feed Streak (`RT-STREAK`); play `SFX-TIMEOUT`; run `PH-FB` (timeout feedback) |"
      }
    }
  },
  {
    "id": "R4#3",
    "label": "Pause the active trial",
    "preconditions": [
      {
        "type": "StatePredicate",
        "entity": "Phase",
        "attribute": "phase",
        "operator": "IN",
        "value": [
          "FirstSymbolDisplay",
          "InterStimulus",
          "SecondSymbolDisplay",
          "Feedback",
          "InterTrial"
        ]
      }
    ],
    "trigger": {
      "type": "Event",
      "name": "PauseOpened"
    },
    "effects": [
      {
        "type": "StateUpdate",
        "entity": "Phase",
        "attribute": "phase",
        "operator": "SET",
        "value": "Pause"
      }
    ],
    "provenance": {
      "mechanic": "R4#3",
      "gdd_quote": "  | R4 | player opens pause during any phase of this trial | freeze the active phase (`PH-PAUSE`). On resume: if no answer has been committed yet (pause during `PH-A`/`PH-ISI`/`PH-B`), re-present THIS trial from `PH-A` with the same A/B and discard any partial input/RT for it; if a result was already committed (pause during `PH-FB`/`PH-ITI`), keep that recorded result and resume the remaining `PH-FB`/`PH-ITI` time with no second `RT-STREAK`/score update (see Screens › Pause) |",
      "precondition": "player opens pause during any phase of this trial",
      "action": "Apply R4#3 under the stated condition and trigger.",
      "expected": "freeze the active phase (`PH-PAUSE`). On resume: if no answer has been committed yet (pause during `PH-A`/`PH-ISI`/`PH-B`), re-present THIS trial from `PH-A` with the same A/B and discard any partial input/RT for it; if a result was already committed (pause during `PH-FB`/`PH-ITI`), keep that recorded result and resume the remaining `PH-FB`/`PH-ITI` time with no second `RT-STREAK`/score update (see Screens › Pause)",
      "evidence": "Observe the listed state changes and emitted cue events.",
      "source": {
        "file": "gdds/small/same_or_shift.md",
        "line_start": 160,
        "line_end": 160,
        "quote": "  | R4 | player opens pause during any phase of this trial | freeze the active phase (`PH-PAUSE`). On resume: if no answer has been committed yet (pause during `PH-A`/`PH-ISI`/`PH-B`), re-present THIS trial from `PH-A` with the same A/B and discard any partial input/RT for it; if a result was already committed (pause during `PH-FB`/`PH-ITI`), keep that recorded result and resume the remaining `PH-FB`/`PH-ITI` time with no second `RT-STREAK`/score update (see Screens › Pause) |"
      }
    }
  },
  {
    "id": "R1#4",
    "label": "Advance correct streak",
    "preconditions": [
      {
        "type": "StatePredicate",
        "entity": "Correct",
        "attribute": "correct",
        "operator": "==",
        "value": true
      }
    ],
    "trigger": {
      "type": "Event",
      "name": "ComparisonTrialStreakUpdated"
    },
    "effects": [
      {
        "type": "StateUpdate",
        "entity": "CurrentStreak",
        "attribute": "currentStreak",
        "operator": "INCREMENT",
        "value": 1
      },
      {
        "type": "StateUpdate",
        "entity": "LongestStreak",
        "attribute": "longestStreak",
        "operator": "SET",
        "value": {
          "kind": "opaque",
          "description": "the incremented currentStreak when it is greater than the longestStreak held before this update; otherwise longestStreak keeps its value (the session maximum of currentStreak)"
        }
      },
      {
        "type": "EventEmission",
        "name": "StreakMilestoneSoundPlayed"
      }
    ],
    "provenance": {
      "mechanic": "R1#4",
      "gdd_quote": "  | R1 | trial `correct` = true | `currentStreak` += 1; if `currentStreak` > `longestStreak` then `longestStreak` = `currentStreak`; if `currentStreak` mod `DBT-11` = 0 then play `SFX-STREAK` + `VFX-STREAK-BURST` |",
      "precondition": "trial `correct` = true",
      "action": "Apply R1#4 under the stated condition and trigger.",
      "expected": "`currentStreak` += 1; if `currentStreak` > `longestStreak` then `longestStreak` = `currentStreak`; if `currentStreak` mod `DBT-11` = 0 then play `SFX-STREAK` + `VFX-STREAK-BURST` StreakMilestoneSoundPlayed is SFX-STREAK with VFX-STREAK-BURST and occurs only when the incremented currentStreak is a nonzero multiple of DBT-11 (5). Table header: **`RT-STREAK` — streak update on each trial result.** Called by `RT-TRIAL` R1/R2.",
      "evidence": "Observe the listed state changes and emitted cue events.",
      "source": {
        "file": "gdds/small/same_or_shift.md",
        "line_start": 254,
        "line_end": 254,
        "quote": "  | R1 | trial `correct` = true | `currentStreak` += 1; if `currentStreak` > `longestStreak` then `longestStreak` = `currentStreak`; if `currentStreak` mod `DBT-11` = 0 then play `SFX-STREAK` + `VFX-STREAK-BURST` |"
      }
    }
  },
  {
    "id": "R2#4",
    "label": "Reset failed streak",
    "preconditions": [
      {
        "type": "StatePredicate",
        "entity": "Correct",
        "attribute": "correct",
        "operator": "==",
        "value": false
      }
    ],
    "trigger": {
      "type": "Event",
      "name": "ComparisonTrialStreakUpdated"
    },
    "effects": [
      {
        "type": "StateUpdate",
        "entity": "CurrentStreak",
        "attribute": "currentStreak",
        "operator": "SET",
        "value": 0
      }
    ],
    "provenance": {
      "mechanic": "R2#4",
      "gdd_quote": "  | R2 | trial `correct` = false (incorrect or timeout) | `currentStreak` = 0 |",
      "precondition": "trial `correct` = false (incorrect or timeout)",
      "action": "Apply R2#4 under the stated condition and trigger.",
      "expected": "`currentStreak` = 0 Table header: **`RT-STREAK` — streak update on each trial result.** Called by `RT-TRIAL` R1/R2.",
      "evidence": "Observe the listed state changes and emitted cue events.",
      "source": {
        "file": "gdds/small/same_or_shift.md",
        "line_start": 255,
        "line_end": 255,
        "quote": "  | R2 | trial `correct` = false (incorrect or timeout) | `currentStreak` = 0 |"
      }
    }
  },
  {
    "id": "R5#3",
    "label": "Save completed session",
    "preconditions": [],
    "trigger": {
      "type": "Event",
      "name": "SessionCompleted"
    },
    "effects": [
      {
        "type": "StateUpdate",
        "entity": "SessionsCompleted",
        "attribute": "sessionsCompleted",
        "operator": "INCREMENT",
        "value": 1
      },
      {
        "type": "EventEmission",
        "name": "GameSessionSaved"
      },
      {
        "type": "EventEmission",
        "name": "SaveSoundPlayed"
      },
      {
        "type": "EventEmission",
        "name": "ProgressSavedTextShown"
      },
      {
        "type": "EventEmission",
        "name": "NewBestSoundPlayedIfAnyRecordImproved"
      }
    ],
    "provenance": {
      "mechanic": "R5#3",
      "gdd_quote": "  | R5 | always | `sessionsCompleted` += 1; write save; play `SFX-SAVED` + show \"Progress saved\"; if any of R1–R3 fired, play `SFX-NEWBEST` once |",
      "precondition": "always",
      "action": "Apply R5#3 under the stated condition and trigger.",
      "expected": "`sessionsCompleted` += 1; write save; play `SFX-SAVED` + show \"Progress saved\"; if any of R1–R3 fired, play `SFX-NEWBEST` once NewBestSoundPlayedIfAnyRecordImproved is SFX-NEWBEST, played once and only when at least one of RT-NEWBEST R1-R3 fired in this completion. Table header: **`RT-NEWBEST` — record updates at session complete** (reads/writes save `DBT-23`). Applied after the session's stats are computed; strictly-better wins only. Results screen: `Progress saved` at (640, 520), 16 px, `COL-HUD`, appears via fade after save (`RT-NEWBEST` R5).",
      "evidence": "Observe the listed state changes and emitted cue events.",
      "source": {
        "file": "gdds/small/same_or_shift.md",
        "line_start": 310,
        "line_end": 310,
        "quote": "  | R5 | always | `sessionsCompleted` += 1; write save; play `SFX-SAVED` + show \"Progress saved\"; if any of R1–R3 fired, play `SFX-NEWBEST` once |"
      }
    }
  },
  {
    "id": "R1#7",
    "label": "Move title highlight",
    "preconditions": [
      {
        "type": "StatePredicate",
        "entity": "Screen",
        "attribute": "screen",
        "operator": "==",
        "value": "Title"
      }
    ],
    "trigger": {
      "type": "Event",
      "name": "Move"
    },
    "effects": [
      {
        "type": "StateUpdate",
        "entity": "Highlight",
        "attribute": "highlight",
        "operator": "SET",
        "value": {
          "kind": "opaque",
          "description": "other item among Start and Quit"
        }
      },
      {
        "type": "EventEmission",
        "name": "NavigationSoundPlayed"
      }
    ],
    "provenance": {
      "mechanic": "R1#7",
      "gdd_quote": "| R1 | TITLE + MOVE | move highlight between [Start],[Quit]; `SFX-NAV` |",
      "precondition": "TITLE + MOVE",
      "action": "Apply R1#7 under the stated condition and trigger.",
      "expected": "move highlight between [Start],[Quit]; `SFX-NAV`",
      "evidence": "Observe the listed state changes and emitted cue events.",
      "source": {
        "file": "gdds/small/same_or_shift.md",
        "line_start": 499,
        "line_end": 499,
        "quote": "| R1 | TITLE + MOVE | move highlight between [Start],[Quit]; `SFX-NAV` |"
      }
    }
  },
  {
    "id": "R2#7",
    "label": "Confirm title action",
    "preconditions": [
      {
        "type": "StatePredicate",
        "entity": "Screen",
        "attribute": "screen",
        "operator": "==",
        "value": "Title"
      }
    ],
    "trigger": {
      "type": "Event",
      "name": "Confirm"
    },
    "effects": [
      {
        "type": "StateUpdate",
        "entity": "Screen",
        "attribute": "screen",
        "operator": "SET",
        "value": {
          "kind": "opaque",
          "description": "Gameplay for Start or application exit for Quit"
        }
      },
      {
        "type": "StateUpdate",
        "entity": "Phase",
        "attribute": "phase",
        "operator": "SET",
        "value": {
          "kind": "opaque",
          "description": "FirstSymbolDisplay (PH-A of trial 1) when Start is highlighted; no trial phase when Quit exits the application"
        }
      },
      {
        "type": "StateUpdate",
        "entity": "SessionSeed",
        "attribute": "session_seed",
        "operator": "SET",
        "value": {
          "kind": "opaque",
          "description": "When Start is highlighted: (2654435761 + 40503 × the persisted sessionIndex read at this start, default 0) mod 2^32, replaced by 1 if the result is 0 (DBT-16), and the 20-trial sequence of this session is built from it (Session & Trial Sequence); unchanged when Quit is highlighted"
        }
      },
      {
        "type": "StateUpdate",
        "entity": "SessionIndex",
        "attribute": "sessionIndex",
        "operator": "INCREMENT",
        "value": {
          "kind": "opaque",
          "description": "1 when Start is highlighted, after session_seed is computed from the value read, and the new value is saved; 0 when Quit is highlighted"
        }
      },
      {
        "type": "StateUpdate",
        "entity": "CurrentStreak",
        "attribute": "currentStreak",
        "operator": "SET",
        "value": {
          "kind": "opaque",
          "description": "0 when Start is highlighted (session counters reset); unchanged when Quit is highlighted"
        }
      },
      {
        "type": "StateUpdate",
        "entity": "LongestStreak",
        "attribute": "longestStreak",
        "operator": "SET",
        "value": {
          "kind": "opaque",
          "description": "0 when Start is highlighted (session counters reset); unchanged when Quit is highlighted"
        }
      },
      {
        "type": "StateUpdate",
        "entity": "CorrectCount",
        "attribute": "correctCount",
        "operator": "SET",
        "value": {
          "kind": "opaque",
          "description": "0 when Start is highlighted (session counters reset); unchanged when Quit is highlighted"
        }
      },
      {
        "type": "EventEmission",
        "name": "GameplayMusicFadedInOnSessionStart"
      },
      {
        "type": "EventEmission",
        "name": "ConfirmSoundPlayed"
      },
      {
        "type": "EventEmission",
        "name": "ConfirmFlashShown"
      }
    ],
    "provenance": {
      "mechanic": "R2#7",
      "gdd_quote": "| R2 | TITLE + CONFIRM | activate highlighted — Start→begin new session; Quit→exit app; `SFX-CONFIRM` |",
      "precondition": "TITLE + CONFIRM",
      "action": "Apply R2#7 under the stated condition and trigger.",
      "expected": "activate highlighted — Start→begin new session; Quit→exit app; `SFX-CONFIRM` GameplayMusicFadedInOnSessionStart is the BGM-PLAY fade-in and occurs only when Start begins a new session. RT-SESSION: `RT-SESSION` — session boundary: on **start** (`RT-FLOW` R2 Start / R13 Play Again) seed and build the sequence (Session & Trial Sequence), reset counters, enter GAMEPLAY at trial 1 `PH-A`, fade in `BGM-PLAY`. Records & Save: On session **start**, read `sessionIndex`, use it to seed the trial sequence, then increment and save `sessionIndex`. Seed: `base = 2654435761`. On session start, read persisted `sessionIndex` (default 0), then `session_seed = (base + 40503 * sessionIndex) mod 2^32`; if the result is 0, use 1. Menus: Menus (Title, Pause, Results) share one interaction model: a vertical option list with one highlighted item; Move keys change the highlight (`SFX-NAV`, `VFX-HILITE`); Confirm activates it (`SFX-CONFIRM`, `VFX-CONFIRM-FLASH`).",
      "evidence": "Observe the listed state changes and emitted cue events.",
      "source": {
        "file": "gdds/small/same_or_shift.md",
        "line_start": 500,
        "line_end": 500,
        "quote": "| R2 | TITLE + CONFIRM | activate highlighted — Start→begin new session; Quit→exit app; `SFX-CONFIRM` |"
      }
    }
  },
  {
    "id": "R5#4",
    "label": "Open gameplay pause",
    "preconditions": [
      {
        "type": "StatePredicate",
        "entity": "Screen",
        "attribute": "screen",
        "operator": "==",
        "value": "Gameplay"
      }
    ],
    "trigger": {
      "type": "Event",
      "name": "Cancel"
    },
    "effects": [
      {
        "type": "StateUpdate",
        "entity": "Screen",
        "attribute": "screen",
        "operator": "SET",
        "value": "Pause"
      },
      {
        "type": "EventEmission",
        "name": "PauseOpened"
      },
      {
        "type": "EventEmission",
        "name": "PauseSoundPlayed"
      },
      {
        "type": "EventEmission",
        "name": "PauseMusicSoundPlayed"
      }
    ],
    "provenance": {
      "mechanic": "R5#4",
      "gdd_quote": "| R5 | GAMEPLAY + CANCEL | open `PH-PAUSE` overlay (freeze phase); `SFX-PAUSE`; apply `BGM-PAUSE` |",
      "precondition": "GAMEPLAY + CANCEL",
      "action": "Apply R5#4 under the stated condition and trigger.",
      "expected": "open `PH-PAUSE` overlay (freeze phase); `SFX-PAUSE`; apply `BGM-PAUSE`",
      "evidence": "Observe the listed state changes and emitted cue events.",
      "source": {
        "file": "gdds/small/same_or_shift.md",
        "line_start": 503,
        "line_end": 503,
        "quote": "| R5 | GAMEPLAY + CANCEL | open `PH-PAUSE` overlay (freeze phase); `SFX-PAUSE`; apply `BGM-PAUSE` |"
      }
    }
  },
  {
    "id": "R8",
    "label": "Move pause highlight",
    "preconditions": [
      {
        "type": "StatePredicate",
        "entity": "Screen",
        "attribute": "screen",
        "operator": "==",
        "value": "Pause"
      }
    ],
    "trigger": {
      "type": "Event",
      "name": "Move"
    },
    "effects": [
      {
        "type": "StateUpdate",
        "entity": "Highlight",
        "attribute": "highlight",
        "operator": "SET",
        "value": {
          "kind": "opaque",
          "description": "other item among Resume and Quit to Title"
        }
      },
      {
        "type": "EventEmission",
        "name": "NavigationSoundPlayed"
      }
    ],
    "provenance": {
      "mechanic": "R8",
      "gdd_quote": "| R8 | PAUSE + MOVE | move highlight between [Resume],[Quit to Title]; `SFX-NAV` |",
      "precondition": "PAUSE + MOVE",
      "action": "Apply R8 under the stated condition and trigger.",
      "expected": "move highlight between [Resume],[Quit to Title]; `SFX-NAV`",
      "evidence": "Observe the listed state changes and emitted cue events.",
      "source": {
        "file": "gdds/small/same_or_shift.md",
        "line_start": 506,
        "line_end": 506,
        "quote": "| R8 | PAUSE + MOVE | move highlight between [Resume],[Quit to Title]; `SFX-NAV` |"
      }
    }
  },
  {
    "id": "R9",
    "label": "Confirm pause action",
    "preconditions": [
      {
        "type": "StatePredicate",
        "entity": "Screen",
        "attribute": "screen",
        "operator": "==",
        "value": "Pause"
      }
    ],
    "trigger": {
      "type": "Event",
      "name": "Confirm"
    },
    "effects": [
      {
        "type": "StateUpdate",
        "entity": "Phase",
        "attribute": "phase",
        "operator": "SET",
        "value": {
          "kind": "opaque",
          "description": "when Resume is highlighted, the paused trial continues per RT-TRIAL R4: if no result was committed (paused in PH-A, PH-ISI or PH-B), FirstSymbolDisplay (PH-A) of the same trial with the same A and B, any partial input and RT discarded, and its later PH-B window a fresh 2.00 s; if a result was committed (paused in PH-FB or PH-ITI), the frozen Feedback or InterTrial phase for its remaining time only, with the recorded result kept and no second RT-STREAK or score update; when Quit to Title is highlighted, the session is discarded and no trial phase continues"
        }
      },
      {
        "type": "StateUpdate",
        "entity": "Screen",
        "attribute": "screen",
        "operator": "SET",
        "value": {
          "kind": "opaque",
          "description": "Gameplay for Resume or Title for Quit to Title"
        }
      },
      {
        "type": "EventEmission",
        "name": "ConfirmSoundPlayed"
      },
      {
        "type": "EventEmission",
        "name": "ConfirmFlashShown"
      },
      {
        "type": "EventEmission",
        "name": "PauseMusicRemovedOnResume"
      },
      {
        "type": "EventEmission",
        "name": "TitleMusicFadedInOnTitleEnter"
      }
    ],
    "provenance": {
      "mechanic": "R9",
      "gdd_quote": "| R9 | PAUSE + CONFIRM | activate — Resume→close overlay & resume the current trial per `RT-TRIAL` R4; Quit to Title→discard session, go TITLE; `SFX-CONFIRM` |",
      "precondition": "PAUSE + CONFIRM",
      "action": "Apply R9 under the stated condition and trigger.",
      "expected": "activate — Resume→close overlay & resume the current trial per `RT-TRIAL` R4; Quit to Title→discard session, go TITLE; `SFX-CONFIRM` RT-TRIAL R4: On resume: if no answer has been committed yet (pause during `PH-A`/`PH-ISI`/`PH-B`), re-present THIS trial from `PH-A` with the same A/B and discard any partial input/RT for it; if a result was already committed (pause during `PH-FB`/`PH-ITI`), keep that recorded result and resume the remaining `PH-FB`/`PH-ITI` time with no second `RT-STREAK`/score update Cross-Section Dependencies: pause during `PH-B` freezes the phase; on resume the trial re-runs from `PH-A` per `RT-TRIAL` R4 | window resets to full 2.00 s on the re-run Pause overlay: Quit to Title discards the session (records unchanged; see Records & Save). Menus: Menus (Title, Pause, Results) share one interaction model: a vertical option list with one highlighted item; Move keys change the highlight (`SFX-NAV`, `VFX-HILITE`); Confirm activates it (`SFX-CONFIRM`, `VFX-CONFIRM-FLASH`). PauseMusicRemovedOnResume is the removal of the BGM-PAUSE treatment and occurs only when Resume is highlighted. BGM-PAUSE: applied on pause enter; removed on resume. TitleMusicFadedInOnTitleEnter is the BGM-TITLE fade-in and occurs only when Quit to Title is highlighted. BGM-TITLE: fade in 0.5 s on Title enter.",
      "evidence": "Observe the listed state changes and emitted cue events.",
      "source": {
        "file": "gdds/small/same_or_shift.md",
        "line_start": 507,
        "line_end": 507,
        "quote": "| R9 | PAUSE + CONFIRM | activate — Resume→close overlay & resume the current trial per `RT-TRIAL` R4; Quit to Title→discard session, go TITLE; `SFX-CONFIRM` |"
      }
    }
  },
  {
    "id": "R10",
    "label": "Cancel pause",
    "preconditions": [
      {
        "type": "StatePredicate",
        "entity": "Screen",
        "attribute": "screen",
        "operator": "==",
        "value": "Pause"
      }
    ],
    "trigger": {
      "type": "Event",
      "name": "Cancel"
    },
    "effects": [
      {
        "type": "StateUpdate",
        "entity": "Phase",
        "attribute": "phase",
        "operator": "SET",
        "value": {
          "kind": "opaque",
          "description": "whatever option is highlighted, the paused trial continues per RT-TRIAL R4: if no result was committed (paused in PH-A, PH-ISI or PH-B), FirstSymbolDisplay (PH-A) of the same trial with the same A and B, any partial input and RT discarded, and its later PH-B window a fresh 2.00 s; if a result was committed (paused in PH-FB or PH-ITI), the frozen Feedback or InterTrial phase for its remaining time only, with the recorded result kept and no second RT-STREAK or score update"
        }
      },
      {
        "type": "StateUpdate",
        "entity": "Screen",
        "attribute": "screen",
        "operator": "SET",
        "value": "Gameplay"
      },
      {
        "type": "EventEmission",
        "name": "CancelSoundPlayed"
      },
      {
        "type": "EventEmission",
        "name": "PauseMusicRemovedOnResume"
      }
    ],
    "provenance": {
      "mechanic": "R10",
      "gdd_quote": "| R10 | PAUSE + CANCEL | resume (as Resume above); `SFX-CANCEL` |",
      "precondition": "PAUSE + CANCEL",
      "action": "Apply R10 under the stated condition and trigger.",
      "expected": "resume (as Resume above); `SFX-CANCEL` RT-TRIAL R4: On resume: if no answer has been committed yet (pause during `PH-A`/`PH-ISI`/`PH-B`), re-present THIS trial from `PH-A` with the same A/B and discard any partial input/RT for it; if a result was already committed (pause during `PH-FB`/`PH-ITI`), keep that recorded result and resume the remaining `PH-FB`/`PH-ITI` time with no second `RT-STREAK`/score update Cross-Section Dependencies: pause during `PH-B` freezes the phase; on resume the trial re-runs from `PH-A` per `RT-TRIAL` R4 | window resets to full 2.00 s on the re-run BGM-PAUSE: applied on pause enter; removed on resume.",
      "evidence": "Observe the listed state changes and emitted cue events.",
      "source": {
        "file": "gdds/small/same_or_shift.md",
        "line_start": 508,
        "line_end": 508,
        "quote": "| R10 | PAUSE + CANCEL | resume (as Resume above); `SFX-CANCEL` |"
      }
    }
  },
  {
    "id": "R12",
    "label": "Move results highlight",
    "preconditions": [
      {
        "type": "StatePredicate",
        "entity": "Screen",
        "attribute": "screen",
        "operator": "==",
        "value": "Results"
      }
    ],
    "trigger": {
      "type": "Event",
      "name": "Move"
    },
    "effects": [
      {
        "type": "StateUpdate",
        "entity": "Highlight",
        "attribute": "highlight",
        "operator": "SET",
        "value": {
          "kind": "opaque",
          "description": "other item among Play Again and Back to Title"
        }
      },
      {
        "type": "EventEmission",
        "name": "NavigationSoundPlayed"
      }
    ],
    "provenance": {
      "mechanic": "R12",
      "gdd_quote": "| R12 | RESULTS + MOVE | move highlight between [Play Again],[Back to Title]; `SFX-NAV` |",
      "precondition": "RESULTS + MOVE",
      "action": "Apply R12 under the stated condition and trigger.",
      "expected": "move highlight between [Play Again],[Back to Title]; `SFX-NAV`",
      "evidence": "Observe the listed state changes and emitted cue events.",
      "source": {
        "file": "gdds/small/same_or_shift.md",
        "line_start": 510,
        "line_end": 510,
        "quote": "| R12 | RESULTS + MOVE | move highlight between [Play Again],[Back to Title]; `SFX-NAV` |"
      }
    }
  },
  {
    "id": "R13",
    "label": "Confirm results action",
    "preconditions": [
      {
        "type": "StatePredicate",
        "entity": "Screen",
        "attribute": "screen",
        "operator": "==",
        "value": "Results"
      }
    ],
    "trigger": {
      "type": "Event",
      "name": "Confirm"
    },
    "effects": [
      {
        "type": "StateUpdate",
        "entity": "Screen",
        "attribute": "screen",
        "operator": "SET",
        "value": {
          "kind": "opaque",
          "description": "Gameplay for Play Again or Title for Back to Title"
        }
      },
      {
        "type": "StateUpdate",
        "entity": "Phase",
        "attribute": "phase",
        "operator": "SET",
        "value": {
          "kind": "opaque",
          "description": "FirstSymbolDisplay (PH-A of trial 1) when Play Again is highlighted; no trial phase when Back to Title opens the Title screen"
        }
      },
      {
        "type": "StateUpdate",
        "entity": "SessionSeed",
        "attribute": "session_seed",
        "operator": "SET",
        "value": {
          "kind": "opaque",
          "description": "When Play Again is highlighted: (2654435761 + 40503 × the persisted sessionIndex read at this start, default 0) mod 2^32, replaced by 1 if the result is 0 (DBT-16), and the 20-trial sequence of this session is built from it (Session & Trial Sequence); unchanged when Back to Title is highlighted"
        }
      },
      {
        "type": "StateUpdate",
        "entity": "SessionIndex",
        "attribute": "sessionIndex",
        "operator": "INCREMENT",
        "value": {
          "kind": "opaque",
          "description": "1 when Play Again is highlighted, after session_seed is computed from the value read, and the new value is saved; 0 when Back to Title is highlighted"
        }
      },
      {
        "type": "StateUpdate",
        "entity": "CurrentStreak",
        "attribute": "currentStreak",
        "operator": "SET",
        "value": {
          "kind": "opaque",
          "description": "0 when Play Again is highlighted (session counters reset); unchanged when Back to Title is highlighted"
        }
      },
      {
        "type": "StateUpdate",
        "entity": "LongestStreak",
        "attribute": "longestStreak",
        "operator": "SET",
        "value": {
          "kind": "opaque",
          "description": "0 when Play Again is highlighted (session counters reset); unchanged when Back to Title is highlighted"
        }
      },
      {
        "type": "StateUpdate",
        "entity": "CorrectCount",
        "attribute": "correctCount",
        "operator": "SET",
        "value": {
          "kind": "opaque",
          "description": "0 when Play Again is highlighted (session counters reset); unchanged when Back to Title is highlighted"
        }
      },
      {
        "type": "EventEmission",
        "name": "GameplayMusicFadedInOnSessionStart"
      },
      {
        "type": "EventEmission",
        "name": "ConfirmSoundPlayed"
      },
      {
        "type": "EventEmission",
        "name": "ConfirmFlashShown"
      },
      {
        "type": "EventEmission",
        "name": "ResultsMusicCrossfadedOutOnLeaving"
      },
      {
        "type": "EventEmission",
        "name": "TitleMusicFadedInOnTitleEnter"
      }
    ],
    "provenance": {
      "mechanic": "R13",
      "gdd_quote": "| R13 | RESULTS + CONFIRM | activate — Play Again→begin new session; Back to Title→go TITLE; `SFX-CONFIRM` |",
      "precondition": "RESULTS + CONFIRM",
      "action": "Apply R13 under the stated condition and trigger.",
      "expected": "activate — Play Again→begin new session; Back to Title→go TITLE; `SFX-CONFIRM` GameplayMusicFadedInOnSessionStart is the BGM-PLAY fade-in and occurs only when Play Again begins a new session. RT-SESSION: `RT-SESSION` — session boundary: on **start** (`RT-FLOW` R2 Start / R13 Play Again) seed and build the sequence (Session & Trial Sequence), reset counters, enter GAMEPLAY at trial 1 `PH-A`, fade in `BGM-PLAY`. Records & Save: On session **start**, read `sessionIndex`, use it to seed the trial sequence, then increment and save `sessionIndex`. Seed: `base = 2654435761`. On session start, read persisted `sessionIndex` (default 0), then `session_seed = (base + 40503 * sessionIndex) mod 2^32`; if the result is 0, use 1. Menus: Menus (Title, Pause, Results) share one interaction model: a vertical option list with one highlighted item; Move keys change the highlight (`SFX-NAV`, `VFX-HILITE`); Confirm activates it (`SFX-CONFIRM`, `VFX-CONFIRM-FLASH`). TitleMusicFadedInOnTitleEnter is the BGM-TITLE fade-in and occurs only when Back to Title opens the Title screen. BGM-RESULT: crossfade 0.4 s out on leaving. BGM-TITLE: fade in 0.5 s on Title enter.",
      "evidence": "Observe the listed state changes and emitted cue events.",
      "source": {
        "file": "gdds/small/same_or_shift.md",
        "line_start": 511,
        "line_end": 511,
        "quote": "| R13 | RESULTS + CONFIRM | activate — Play Again→begin new session; Back to Title→go TITLE; `SFX-CONFIRM` |"
      }
    }
  },
  {
    "id": "R14",
    "label": "Cancel results",
    "preconditions": [
      {
        "type": "StatePredicate",
        "entity": "Screen",
        "attribute": "screen",
        "operator": "==",
        "value": "Results"
      }
    ],
    "trigger": {
      "type": "Event",
      "name": "Cancel"
    },
    "effects": [
      {
        "type": "StateUpdate",
        "entity": "Screen",
        "attribute": "screen",
        "operator": "SET",
        "value": "Title"
      },
      {
        "type": "EventEmission",
        "name": "CancelSoundPlayed"
      },
      {
        "type": "EventEmission",
        "name": "ResultsMusicCrossfadedOutOnLeaving"
      },
      {
        "type": "EventEmission",
        "name": "TitleMusicFadedInOnTitleEnter"
      }
    ],
    "provenance": {
      "mechanic": "R14",
      "gdd_quote": "| R14 | RESULTS + CANCEL | go TITLE; `SFX-CANCEL` |",
      "precondition": "RESULTS + CANCEL",
      "action": "Apply R14 under the stated condition and trigger.",
      "expected": "go TITLE; `SFX-CANCEL` BGM-RESULT: crossfade 0.4 s out on leaving. BGM-TITLE: fade in 0.5 s on Title enter.",
      "evidence": "Observe the listed state changes and emitted cue events.",
      "source": {
        "file": "gdds/small/same_or_shift.md",
        "line_start": 512,
        "line_end": 512,
        "quote": "| R14 | RESULTS + CANCEL | go TITLE; `SFX-CANCEL` |"
      }
    }
  }
]