Figure 1.

Temporal order of stimuli in the antisaccade task. In reward anticipation trials the instruction cue was a gold circle; in no reward trials the instruction cue was a silver circle. In specific spatial preparation trials, an arrow was displayed, indicating where the subsequent antisaccade target would appear; in neutral non-specific preparation trials, a bar was presented. The length of the preparation interval between the instruction cue and the antisaccade target was varied between 4.5 and 6 s. Immediately after the antisaccade a golden coin was displayed when a reward had been won; a silver circle was presented after a correct response on a non-reward trial, and after an incorrect or slow response a silver ring was displayed.