Among 65 readable first-subject OpenNeuro iEEG files, 29 were ECOG-only and 19 were SEEG-only

We counted channel types in the first channels.tsv file from the first lexically ordered subject folder in a partial list of 73 OpenNeuro iEEG datasets. The file was readable for 65 datasets: 19 listed SEEG only, 13 listed both SEEG and ECOG, 29 listed ECOG only, and 4 listed neither. Several datasets described in SCI publications as SEEG, including ds005448, ds003498, and ds007118–ds007120, listed ECOG and no SEEG type. The BIDS type field alone therefore did not reliably identify depth electrodes in this census. The analysis used the live OpenNeuro S3 state on 2026-10-13 and did not verify electrode hardware. It examined one subject per dataset, and the GraphQL dataset list was partial.

intracranial EEG · iEEG · BIDS · OpenNeuro · SEEG · ECOG · channels.tsv · dataset metadata