Stop-signal reaction time calculation.

<p>The figure illustrates the relation between stop signal delay, the stop signal reaction time and the distribution of go reaction times. The distribution of go reaction is integrated from the time of go signal presentation. For each stop signal delay, a probability of responding is obtained. If the stop signal delay of 50 ms resulted in an error rate = .20, this means that the end of the stop process should be at a point equal to 20% of the go RT distribution. If the point of 20% of the go RT distribution was 250 ms, so the observed SSRT would be 252–50 ms. The rest of the SSRT were calculated with the same procedure. A summary SSRT was acquired by averaging the observed three SSRTs that corresponded to 0.15[28].