Figure 2.

(a,b) Rats preferentially revisit the chocolate location when it is about to replenish in (a) encoding failure and (b) retention-interval experiments. The data are mean with 1 s.e.m.; the probability of at least one revisit to the chocolate location was calculated from the first five choices in memory-assessment phases (1 if at least one revisit occurred; 0 otherwise). Replenishment is different from non-replenishment: **p < 0.01, ***p < 0.001. The probability expected by chance is 0.487 (calculated with a geometric distribution). (a) All values are above chance (p < 0.001). (b) Mean across retention intervals less than 14 days are above chance in replenishment (p < 0.001) and non-replenishment (p < 0.05); performance is not different from chance at 14 day delay.