THINGS-EEG1 snapshot 1.2.0 stores event duration in milliseconds and has 169 sequences with at least 90% of marker intervals below 48 ms

We checked all 50 event tables in THINGS-EEG1, OpenNeuro ds003825 snapshot 1.2.0. All 1,217,712 rows store duration as 50, with milliseconds stated in the source sidecar. BIDS requires seconds. A checked tool divides this field by 1,000 and gives 0.05 seconds, while preserving every other cell. All rows match recording onset and offset markers. A literal seconds reading gives a median of 406 active event annotations at each onset; the unit correction gives one. An exploratory check found 49,454 marker intervals below 48 ms. Of these, 49,452 occur in recordings 38 to 42. In those five recordings, 169 sequences have at least 90% short intervals. Their median short marker duration is 43 ms, and median onset spacing after short intervals is 94 ms. Nearby limits from 45 to 49 ms give the same five recordings and 169 sequences. Software and marker duration differences stay within 1.201 ms for all 1,205,352 rows with software timing. The package supplies complete timing data, original markers, source hashes, correction code, results, figures, and reproduction instructions. These findings describe stored clocks and event annotations. They do not measure screen light or an effect on EEG responses.

THINGS-EEG1 · OpenNeuro · EEG · BIDS · event duration · timing markers · data quality · reproducibility