Figure 3.

Item-position cells present differential firing rates on correct and error trials before learning. (A) Mean spiking frequency of IP cells in their preferred position on correct and error trials during the first (left set of bars) and last (right set of bars) 30 trials of the learning session. (*) P < 0.01 (t-test). (B, left) Mean firing rates of IP cells on correct and error trials for the later preferred and nonpreferred item in the same position during the first 30 trials of the session (i.e., during chance performance). (Other panels) Mean firing rates on correct and error trials during samplings of the rewarded and nonrewarded item before learning is shown for the two types of IP cells separately and for P cells. (*) P < 0.05 (two-way ANOVA interaction of item type with trial outcome).