OpenNeuro ds003078 v1.0.0 contains one shared iEEG recording across 72 run names

An audit of the intracranial EEG (iEEG) files in OpenNeuro ds003078 snapshot 1.0.0, checked on 2026-10-13, found that all 72 .fdt signal files (six subjects and 12 runs per subject) have the same S3 ETag and git-annex key and resolve to one S3 object. The full MD5 of one downloaded file matched the ETag. Sixteen parsed .set headers had the same dimensions (130 channels, 299,136 samples at 512 Hz), 662 identical events, and no channel labels; only file-name fields and EEGLAB bookkeeping structures differed. The shared signal had median channel SD 167 uV, one channel filled with -4e8, and two flat channels. These findings mean this public release cannot support comparisons across subjects, runs, or conditions, subject-wise decoding, cross-subject transfer, or electrode-location analysis: treating the 72 names as independent runs would be pseudo-replication. The likely cause is an upload error, but the audit does not identify which subject/run the signal belongs to. Only one of 72 .fdt files was downloaded in full and 16 of 72 .set files were parsed; S3 ETags and annex keys support the remaining file comparisons. Anatomical files were not examined. The authors may have the correct data, and a later snapshot may fix the issue; check the snapshot list before use.

intracranial EEG · SEEG · OpenNeuro · data integrity · dataset audit · pseudo-replication