Cluster in left anterior insula (AI), which was differently correlated with RT, depending on Switch (switch, non-switch) and motivation (approach, avoidance) during the preparatory period.

Activity here predicted slower responding, especially on avoidance-switch trials and approach-non-switch trials. Graph shows parameter estimates, with the y-axis indicating the strength of the correlation between BOLD activity in this region and RT. Error bars represent +/- 1 SE.