Fig. 1.

Sequence and time course of the events for a trial. Participants searched for a color-defined target (red or green) and reported the orientation of the bar within the target as vertical or horizontal. Correct responses resulted in a small amount of money added to the participant's bank total. One color target yielded a high reward for correct responses on 80% of trials (high-reward target), whereas the other color target yielded a high reward on only 20% of correct response trials (low-reward target).