Hybrid delays give smaller mean absolute score differences between fixed run halves in 126 ds00030 controls.

In 126 control runs from OpenNeuro ds000030 version 1.0.0, hybrid stop-signal delays gave smaller mean absolute SSRT differences between two fixed halves of one scanner run than recorded delays. The hybrid-minus-recorded contrasts were -8.06 ms for temporal halves (95% participant-bootstrap interval [-16.31, -0.01499]) and -13.45 ms for interleaved halves ([-19.34, -8.03]). The hybrid rule increased absolute differences for 38 temporal and 27 interleaved participants; median paired change was zero in both splits. The temporal interval crossed zero in four of five seed checks, and signed temporal differences increased. Results describe two short halves with 16 STOP trials each, shared adaptive task history, fixed task observations, and assumed field units. They do not establish which delay field matches physical sound onset.

stop-signal task · SSRT · split-half differences · hybrid delay · participant bootstrap · OpenNeuro ds000030