GO time changes have lower phase rank correlation than GO median times in 266 ds000030 participants.

Across 266 paired training and scanner records from OpenNeuro ds000030 snapshot 00016, the Spearman correlation between phases was 0.135615 for the second-half minus first-half GO median time change and 0.698836 for the whole-run GO median time. Their paired correlation difference was −0.563221 (95% participant-bootstrap interval [−0.702874, −0.405227]). Screening 235 pairs by STOP response fraction [0.25, 0.75] and GO omission fraction ≤0.05 gave correlations of 0.132059 and 0.724383, respectively, and a difference of −0.592324 (95% interval [−0.744490, −0.434602]). Relative and fitted GO time changes also had lower phase rank correlations than GO median time. Group slowing was positive in both phases, but participant ranks for change showed low phase agreement. These observations apply to the short runs and recorded snapshot; the comparison does not establish test–retest reliability under equal task conditions, a general trait measure, or a biological cause. The analysis does not adjust for diagnosis mixture, participant selection, or serial dependence. Intervals assume participants are independent samples and describe participant sampling, not trial measurement error, equipment error, or data-version changes.

stop-signal task · GO response time · phase agreement · Spearman correlation · participant rank · bootstrap · OpenNeuro ds000030