2018 Volume 46 Issue 6 Pages 551-560
We examined neurocognitive process of response control during the Stop-signal task by setting up the difference of visual stimulus condition. The aim of this study was to examine how the type of Go and Stop stimuli and combination of them, related to car (the car stimulus condition) and sign (the sign stimulus condition), is reflected in behavioral performances and ERP. Twenty-three adults participated in this experiment. As a result, the reaction time (RT) and the stop signal reaction time (SSRT) was significantly prolonged in the car stimulus condition, and also the commission error rate to Go stimulus was significantly increased, than in the sign stimulus condition. In ERP, significantly higher GFP peak and longer GFP latency from 175 ms to 225 ms after the Go stimulus was onset, in the car stimulus condition. Similarly, significantly higher GFP peak from 175 ms to 225 ms after the Stop stimulus was onset, and significantly lower GFP peak from 230 ms to 400 ms after the Stop stimulus was onset, additionally the amplitude of the SST-P3 decreased in the car stimulus condition, than in the sign stimulus condition. These results suggest that the difference of the stimulus condition, especially the difficulty of the stimuli distinction, affects the attentional resource allocation to the both Go stimuli and Stop ones in the Stop-signal task. And the effects might be reflected in the both behavioral performances and ERPs.
