After both roles change, identity overlap equals the II indicator in the three-color Stroop records of ds004636 1.0.4

We checked adjacent stored trials in OpenNeuro ds004636 version 1.0.4. In its three-color Stroop task, identity overlap equals the II indicator after both target and distractor change from their previous roles. II means that both trials are incongruent. The equality held in all 4,605 stored pairs under this filter and all 4,081 valid pairs. An exact proof and full enumeration confirmed it. In the stated additive mean response-time model, the interaction and overlap columns are equal. Their separate coefficients cannot be estimated. A stricter no-overlap rule removes all Stroop II pairs. In the two-direction attention network test, changing both roles removes CI and IC pairs. These subsets cannot give a complete four-cell score. The main Stroop comparison used the same 78 people under both rules. The mean filtered-minus-all change was -17.24 ms, with a 95% person bootstrap interval from -39.34 to 3.95 ms. This comparison is uncertain and does not identify a cognitive mechanism. The package preserves original files, fixed source URLs and hashes, all checks, an exact model audit, figures, code, and a reuse tool. Offline and fresh-source repeats compare eleven numeric outputs by hash.

Stroop task · attention network test · sequence effects · feature integration · identity overlap · structural zeros · OpenNeuro · response time · model identifiability