None of 126 ds000030 CONTROL runs has three selected triplets in each of four arrow and button history cells.

In 126 public OpenNeuro ds000030 CONTROL runs, this exploratory work counted trials for a proposed reaction-time comparison after successful stops. It found 682 usable consecutive correct GO–successful STOP–correct GO triplets, but no participant had three triplets in each of the four cells crossing STOP-arrow repetition with repetition of the last recorded button. Only 27 participants had at least one triplet in every cell. This is a support count, not an RT effect estimate, power calculation, or population estimate. In the two-arrow task, arrow identity and required button identity are confounded; a successful STOP has no recorded button, and the 38 observed arrow/button repetition disagreements followed unsuccessful STOP choice errors. The findings apply to the specified source files and selection rules. The work does not establish a causal mechanism, and the counts do not show that all models using participants with missing cells will fail.

stop-signal task · reaction time · response history · trial support · OpenNeuro ds000030