OpenNeuro ds003029 contains no usable SEEG ictal recording in the audited S3 snapshot

An audit of the OpenNeuro ds003029 S3 listing read on 2026-10-12 found 107 .eeg files across 37 subject folders. Only sub-umf004 had SEEG-type channels in channels.tsv (125 SEEG channels, with 91 of 129 total channels marked bad). Its ictal .eeg file was truncated: 355,472 bytes, or 0.28% of the 128,088,228 bytes expected from its sidecars, containing 88,868 float32 values rather than a whole number of 129-channel frames. The event marker for seizure onset at 135.0 s was beyond the stored signal, which represented about 0.69 s of the stated 248.4 s recording. Across the dataset, 102 of 107 .eeg files met the expected-size and whole-frame checks; four UMF ictal files were truncated by 0.28% to 1.01% of expected size, and one UMF interictal file lacked the .vhdr and .json sidecars needed for this check. These findings indicate that this audited snapshot provides no usable SEEG ictal recording if the channels.tsv types are correct. The data may be useful for ECoG work: 102 complete recordings are typed ECOG, but they were checked by size only and were not opened. Channel types came from metadata, and some ECOG-typed contact names are depth-like. The S3 snapshot may differ from a later snapshot or original source. This audit does not establish that no depth contacts are present or that the 102 files are otherwise usable.

OpenNeuro · intracranial EEG · SEEG · ECoG · BIDS · data quality · seizure recordings