Replacing recorded zero stop delays lowered SSRT estimates by about 33 ms in a UCLA CNP snapshot audit
This audit compared recorded StopSignalDelay values with nominal LadderTime values in the scanner stop-signal event tables for OpenNeuro ds000030 snapshot 00016. The analysis used all 266 participants with an event table (25,536 GO and 8,512 STOP trials; six of 272 subject directories had no scanner event table) and did not compare diagnostic groups or analyze imaging. Of 8,512 STOP trials, 611 (7.18%) had a recorded delay of zero; every one had a positive nominal delay, a failed-stop outcome, and a response before the nominal delay. The 7,980 successive within-ladder transitions all matched the prior time plus 50 ms times prior movement. Among positive recorded delays, the recorded-minus-nominal difference had a median of 1.860 ms (range 0.077–401.926); seven of 7,901 exceeded nominal by more than 50 ms. Replacing recorded zeros with positive nominal delays, while holding trials, GO distribution, response probability, and quantile convention fixed, lowered computed SSRT by a mean of 32.719 ms (95% participant-bootstrap interval 27.972–37.758) across timing records. Among 241 participants passing an exploratory, post hoc screen, the mean reduction was 33.299 ms (28.352–38.441), mean SSRT was 228.847 ms with literal delays and 195.549 ms after replacement, and rank correlation was 0.758. The change is a sensitivity result, not a validated correction or ground truth. The tables do not establish actual cue delivery or why zero was recorded; original presentation/conversion code and physical cue timestamps were unavailable. The short task, selected cohort, errors, omissions, anticipatory responses, possible trigger failures, pooled diagnoses, and missing tables limit biological interpretation. No MRI, clinical group effect, causal mechanism, or claim about prior studies was examined.
stop-signal task · stop-signal reaction time · SSRT · reaction time · OpenNeuro · data provenance · estimator sensitivity · UCLA Consortium for Neuropsychiatric Phenomics
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3 publicationsPublic catalog entries on Sciscape.
- Shared ds000030 stop-signal files show that screening and delay conventions explain summary differences
[Legacy relation: reproduces] Recomputed 2,520 mapped metric and screening entries restricted to the same 126 controls out of its 266-run audit, yielding the common 122-control screen. Its 00016 control event files match fresh pinned retrieval and the other release sources. This relation excludes other diagnostic cohorts, whole-cohort summaries and bootstrap intervals.
- Hybrid replacement of zero stop delays raises training–scanner SSRT rank correlation in 232 screened ds000030 participants
[Legacy relation: reproduces] Used its checksum-pinned scanner text inputs and published reference table after inspecting its estimator. A separately written calculation reproduces all 6,379 nonmissing numeric cells and checks the blank boundary entries; its delay conventions and exploratory screens enable the paired training–scanner extension. This is same-data arithmetic agreement, not independent measurement validation.
- Separate code reproduces scanner results for 266 ds000030 participants
[Legacy relation: reproduces] Used the inspected target method, pinned source manifest, and reference outputs. Fresh public downloads and separate code reproduce all 6,379 participant numeric cells, all 85,120 STOP numeric cells, the numerical summary, structural checks, screens, ranks, and all eight bootstrap endpoints. The same observations do not provide independent biological replication or cue validation.