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MER 2026: MER-PS (Physiological Signal-Based Emotion) Codabench Public Training/Validation Data
This release contains the public MER_PS data for model development in the Codabench valence-arousal regression task. The subject identifiers are anonymized as test_1 through test_24.
The task is to model continuous emotional state from synchronized EEG and fNIRS recordings. Dynamic labels are provided at 1 Hz for two affective dimensions:
valence: pleasantness of the emotional statearousal: activation level of the emotional state
Valence and arousal use the original MER_PS raw label scale [1, 255]. The center of the valence-arousal plane is (128, 128).
Data Modalities
| Modality | Channels | Sampling Rate | Description |
|---|---|---|---|
| EEG | 64 | 200 Hz | EEG signals during baseline and video stimulation |
| fNIRS | 51 | 47.62 Hz | fNIRS signals during baseline and video stimulation |
| Annotation | 2 | 1 Hz | Continuous valence and arousal labels |
Each trial includes a 5-second baseline period before video onset. Each subject watched 15 emotion-inducing video clips.
Directory Structure
MER_PS_codabench_public_trainval/
├── README.md
├── Metadata.csv
├── SAM_score.csv
├── PANAS_score.csv
├── Targeted_emotions.txt
├── fNIRS_coordinates.csv
├── fNIRS_reservations.csv
├── data/
│ ├── test_1/
│ │ ├── EEG_baselines.mat
│ │ ├── EEG_videos.mat
│ │ ├── fNIRS_baselines.mat
│ │ └── fNIRS_videos.mat
│ ├── ...
│ └── test_24/
└── annotations/
├── test_1_label.mat
├── ...
└── test_24_label.mat
Files
Metadata.csv contains anonymized subject metadata.
SAM_score.csv contains post-trial subjective ratings based on the Self-Assessment Manikin scale.
PANAS_score.csv contains Positive and Negative Affect Schedule scores.
Targeted_emotions.txt lists the targeted emotion category for each video.
fNIRS_coordinates.csv contains the 3D coordinates of fNIRS channels.
fNIRS_reservations.csv contains fNIRS channel reservation records.
Signal Files
Each subject folder under data/ contains:
EEG_baselines.mat
EEG_videos.mat
fNIRS_baselines.mat
fNIRS_videos.mat
The .mat files store trial-wise arrays such as video_1, video_2, ..., video_15.
EEG arrays are organized as:
channel × time
fNIRS arrays are organized as:
signal_type × channel × time
The fNIRS signal type dimension includes HbO, HbR, HbT, Abs 780 nm, Abs 805 nm, and Abs 830 nm.
Annotation Files
Each file in annotations/ contains dynamic valence-arousal labels for one anonymized subject:
annotations/test_1_label.mat
Each annotation array has shape:
2 × time
The first row is valence and the second row is arousal.
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