A first-subject check found ECoG-only channels in 22 of 32 uncited OpenNeuro iEEG datasets

We examined the first subject and first channels.tsv file from 72 of 73 OpenNeuro iEEG datasets listed in a prior SCI publication (snapshot tags dated 2026-10-12), and made an HTTP range request for the first 64 KiB of one raw file per dataset. Of the 32 datasets recorded with zero SCI publications, 22 had only ECoG channels; two had SEEG only (ds006253 had no raw file in the API listing, and ds008610 was non-human primate); two human datasets with retrievable raw files had mixed SEEG and ECoG (ds004194: 8 SEEG and 56 ECoG contacts; ds004865: 11 SEEG and 70 ECoG contacts); two had neither SEEG nor ECoG channel types; and four had no channels.tsv or returned HTTP 403. Across the 72 completed datasets, 32 first subjects had SEEG channels, 68 raw-file range requests succeeded, and 65 channels.tsv downloads succeeded. ds007703 returned HTTP 403 for all tested files. This is a first-subject check only: other subjects can differ, channel types are as dataset authors labeled them, and ds004624 did not finish within the time limit. The source conclusion says 33 datasets had no SCI publication, while the reported zero-publication subgroup count is 32. The included records, code, table, and figure preserve the check and its limitations.

intracranial EEG · stereo-EEG · SEEG · ECoG · OpenNeuro · data access · channel types · dataset census