The linear brightness effect on response-time conflict is uncertain in 21 ds005113 records under the supplied event map

We tested whether stimulus brightness changes the response-time cost of conflicting flanker arrows. We used all 21 records from OpenNeuro ds005113 version 1.0.0. The event reader used the supplied map and inverted numeric codes. It recovered 12,580 trials that passed marker checks. The primary test used 10,920 correct-response intervals. The mean conflict-cost change was -3.82 milliseconds per 100 brightness-code steps. The 95 percent confidence interval was -8.11 to +0.48 milliseconds. This interval leaves the linear effect uncertain. All six planned checks are reported. Secondary tests found faster responses and fewer conflict-related errors at higher codes. The records use codes 1 to 190; the supplied task uses 1 to 200. The display gray map and response clock remain assumptions. The package preserves source bytes, hashes, code, a trial table, plots, and reproduction instructions. All numerical files and the PNG matched a run from fresh source downloads. We did not analyze EEG signals.

flanker task · response time · cognitive control · brightness · conflict cost · OpenNeuro · event decoding