The fourth GO before STOP has a 34.18 ms longer mean RT than the last GO in 53 selected ds000030 participants.

In 53 selected control participants from OpenNeuro ds000030, the mean reaction time (RT) for the fourth GO before STOP was 34.177394 ms longer than for the last GO. The comparison used the same 193 trial windows and participants for four reference RTs. Replacing the last-GO reference with the fourth-GO reference changed each of three post-STOP contrasts by the same amount; the approximate simultaneous 95% interval for this change was [-60.926163, -7.428625] ms. The 193 windows came from 18 schedules. Most fourth-GO references had a STOP in their preceding three active trials (169/193). A planned restriction requiring seven GO trials before STOP yielded zero eligible participants, so the analysis cannot separate pre-STOP response change from a remaining effect of an earlier STOP. Other sensitivity analyses included a five-window subset of 10 participants, for which the P1-P4 change was 7.418416 ms (interval [-34.098843, 48.935676]); equal weighting of the 18 schedules gave -27.865537 ms without an interval. These results do not establish a biological cause, equivalence, or generalization to new schedules. The intervals assume independent participant measurements conditional on the tested schedules. Recent STOP history, arrow repetition, pause durations, task position, and response selection may contribute to RT differences.

reaction time · stop-signal task · reference choice · post-STOP response · behavioral data · OpenNeuro ds000030