Skin Conductance (scr)

Following the guidelines from BIDS v1.10.0, we propose the following additional requirements for skin conductance data.

Modality specific data SHOULD be split into modality specific files carrying the modality-label. Modality label for skin conductance is scr and scr specific data files would be organized as follows

physio/
├─ sub-01_ses-1_task-TaskName_recording-scr_physio.json
├─ sub-01_ses-1_task-TaskName_recording-scr_physio.tsv.gz

Column names in the scr data files MUST be scr for experiments involving single recordings, or scr1, scr2, scr3, … for experiments involving simultaneous parallel SCR recordings from different locations on the body.

These fields MUST be included in the JSON sidecar file: <matches>_recording-scr_physio.json

Additional Metadata Fields

Table 1: Required SCR-Specific JSON Fields

Key	Description	Data Type	Possible Values
SCRCouplerVoltage	Voltage of the constant voltage SCR coupler (in V).	Number	e.g., 0.5
SCRCouplerType	Type of SCR coupler.	Text	AC, DC
Placement	Position of SCR electrodes on the body.	Text	thenar/hypothenar, digits 2/3, …

Example TSV Data File

scr
0.0198363792144107
0.0152587424956607
0.0198363792144107
0.0152587424956607
0.0198363792144107
...

In case of compressed tabular files (like `.tsv.gz`) column names MUST NOT be included.

Example JSON Sidecar

{
    "Columns": [
        "scr"
    ],
    "Manufacturer": "Biopac",
    "ManufacturersModelName": "EDA100C",
    "DeviceSerialNumber": "1111-1111-1111",
    "SamplingFrequency": 2000,
    "SoftwareVersion": "Acquisition 1.10",
    "StartTime": 0,
    "PhysioType": "specified",
    "scr": {
        "Description": "SCR Recording",
        "SCRCouplerType": "AC",
        "SCRCouplerVoltage": 0.5,
        "Placement": "thenar",
        "Units": "microsiemens"
    }
}