Figure 7. RTs associated with a frequent target as a function of the pattern of targets appearing on the 4 just-preceding trials. For the value 0 there was no infrequent target in that set. For the value 1, the single infrequent target appeared in the first (most distant) position; when it was 4 it appeared on the trial just preceding the measured RT. The differences among these RTs were not significant, and there was no evidence for carry-over effects of just seen stimuli.