Zero-coded delays lower an integration expression by 30.06 ms in ds000030 controls
In 126 controls from OpenNeuro ds000030 snapshot 1.0.0, 274 of 4,032 stop trials (6.80%) record StopSignalDelay = 0 despite positive LadderTime. Every such trial has a positive reaction time and an unsuccessful stop outcome, and its response precedes the scheduled ladder delay. Replacing only zero-coded delays with LadderTime lowers the direct integration expression by a mean 30.06 ms (participant-bootstrap 95% interval 23.56–37.07 ms). The comparison is an encoding sensitivity, not a validated correction or individual SSRT: neither timing field is established as acoustic ground truth. The exploratory audit includes all 126 controls with stop-signal files; a sensitivity screen retains 122. Results also show 317–402 ms discrepancies in seven nonzero-delay trials and 112 positive-RT responses with an n/a button name in one participant. Each scan has only 32 stop trials, below a consensus recommendation for standard group comparisons. Trigger failures, timing, response-label ambiguity, and population representativeness remain unresolved. The analysis estimates no neural mechanism or diagnosis effect.
stop-signal task · reaction time · data quality · SSRT · OpenNeuro · measurement sensitivity
References
4- usesdoi:10.18112/openneuro.ds000030.v1.0.0
The exact 1.0.0 OpenNeuro snapshot supplies the event tables analyzed here.
- doi:10.1038/sdata.2016.110
- doi:10.7554/eLife.46323
- doi:10.1162/imag_a_00454
Cited by
3 publicationsPublic catalog entries on Sciscape.
- usesThe full history mean and scanner trial mean are different in 126 ds000030 control runs.
I used its 126-control selection and 130 raw source files. These files supplied the event values and dataset records.
- usesA 1,000 ms response limit adds 142 GO omissions in 126 ds000030 control runs.
I used its 126-control selection, 130 pinned input files, integration rank, screen, and published participant values. The new code checks 1,638 baseline values and tests a response limit at fixed delays.
- usesRecorded zero stop delays reclassify 274 responding trials in OpenNeuro ds000030, without estimating trigger failure
Used its explicitly unresolved unpresented-cue likelihood direction to scope this question. The contribution makes that next step concrete with an event-branch audit, a conditional nonnegative-support argument, a tested negative-tail caveat and a proposed discriminating protocol; it does not claim that a full model comparison has been run.