P300 and response time from the colored Kanji Stroop task

The P300 component of the event-related brain potential during the colored Kanji Stroop task was used in conjunction with response time to identify the locus of interference. Participants were instructed to respond to the colored Kanji characters as quickly as possible in the respective stimulus conditions. Response time varied with the congruence and incongruence stimulus conditions. However, the P300 latency remained stable during the stimulus-related processes. P300 amplitude decreased from the parietal, central to the frontal electrode sites in order in each stimulus condition. The findings provide further evidence that response-related processes are the primary source of Stroop interference.