Mean temporal half-run SSRT is at least 10 ms from full-run SSRT in 11 of 102 selected ds000030 runs.

This analysis compares full-run stop-signal reaction time (SSRT) with the mean of two half-run SSRT scores in 102 selected control runs from OpenNeuro ds000030 release R1.0.5. Four fixed trial-split rules were evaluated with the integration method, which estimates SSRT from a GO reaction-time quantile and mean STOP delay. With the main rank quantile, absolute full-versus-half differences were at least 10 ms in 11/102 temporal, 12/102 interleaved, 8/102 staircase, and 5/102 staircase-reversed-GO runs. Mean absolute differences were 4.766, 4.540, 3.736, and 3.481 ms, respectively. All selected runs had nonzero differences. Participant-bootstrap 95% percentile intervals for mean absolute differences were 3.835–5.800, 3.662–5.486, 3.125–4.381, and 2.834–4.206 ms; all intervals for signed mean differences included zero. A linear quantile check changed the signed means, so the signed result depends on the quantile rule. The analysis preserves timing uncertainty: its planned, recorded, and hybrid delay rules do not determine correct acoustic onset. It does not establish a true stopping time, identify the more accurate score, validate the race model, or estimate test-retest reliability. Each half-run contains only 16 STOP trials, and the results concern these records, screening rules, and calculations.

stop-signal task · stop-signal reaction time · SSRT · half-run · score aggregation · integration method · quantile · reaction time · trial splitting · OpenNeuro ds000030