Figure 1.

Experimental procedure and behavioral results. A, In the Eriksen Flanker task subjects respond to the direction of the central arrow. This is flanked by arrows in the same direction (congruent), the opposite direction (incongruent), or squares (neutral). B, The pilots demonstrated significantly increased incongruence costs (pure cost, benefit and incongruence cost), but did not show significant differences in RT at the group level. C, Congruent; N, neutral; I, incongruent stimuli. C, In the change of plan task subjects respond to the green GO signal, unless they see a red CHANGE arrow. D, There was no significant different between pilots and controls on this task. Error bars indicate ±SEM.