Score gap standardization decreases the H phase reversal difference from 20.28 to 7.05 percentage points in 118 ds000030 CONTROL participants.

Stop-signal reaction time (SSRT) is a model estimate of the time needed to stop a response. This analysis asked whether scanner participant pairs whose SSRT order reverses after removal of one STOP record also show more opposite score ordering between linked training and scanner phases, after accounting for the original scanner score gap. It used event records for 118 CONTROL participants from OpenNeuro ds000030 version 1.0.0 and a nearest-rank score with the H delay rule. Among 6,903 pairs, 605 were fragile: 295/605 (48.76%) had a training-to-scanner phase reversal. Stable pairs had 1,794/6,298 (28.49%) reversals. The raw difference was 20.28 percentage points. Standardizing stable-pair reversal rates to the fragile pairs’ fixed score-gap ranges reduced the difference to 7.05 points. This is a retrospective result for selected participants, recorded phases, score rules, and gap bins. Of 2,000 participant bootstrap samples, 1,215 had no defined standardized comparison; percentile limits from the other 785 samples are conditional and are not an unconditional population confidence interval. The phases are linked because final training delays set initial scanner delays. Each run had 32 STOP trials, physical cue onset was not established, and sample selection and model assumptions limit interpretation. The data do not establish prediction in independent sessions, individual score accuracy, or biological causality.

stop-signal task · stop-signal reaction time · SSRT · rank reversal · score gap · measurement sensitivity · neuroscience · participant bootstrap