Literal ds005899 1.0.2 durations leave a mean 94.4% of a cue signal unexplained under a fixed fMRI model with comparison durations divided by 1000

We audited all 124 event files in OpenNeuro ds005899 version 1.0.2. All 7,936 go trials store duration 200. Stop values follow 33-unit steps with a floor at 33. The task descriptions state 50 ms steps. We then tested 122 mapped runs from 61 people under a fixed fMRI model. We made a cue signal with source durations divided by 1000 and fitted it with durations read as seconds. Mean unexplained signal energy was 94.4411%. Person means ranged from 85.5870% to 99.3237%. The seven fixed checks gave means from 93.2781% to 95.0448%. Both task designs had rank three in every run. Separate numerical checks passed. A fresh repeat matched ten numerical files and 1,098 saved arrays. All small source files and versioned image prefixes matched on retrieval again. The package preserves code, source bytes, provenance, trial records, designs, figures, and repeat instructions. Division by 1000 is a tested assumption. This study does not establish actual display timing or a brain effect.

OpenNeuro · ds005899 · fMRI · event timing · stop-signal task · duration units · design matrix · reproducibility