Fig. 4.

Visual associative task (experiment 1, task 1). The left side shows the total errors (including correction errors) each animal made in relearning to perform the visual association task with 0 and 2 sec delays. A histogrambar is shown for the control group (always on theleft) and the experimental group (always on theright) for each delay time. The right side shows the error scores for relearning the task with simultaneous presentation of the sample and match choices and with 0 and 2 sec delays. Hatching indicates postoperative performance of the experimental group after the ventral prefrontal cortex has been removed from area 47/12. Bar heightsindicate group mean performance; • and ▪, performance of individual animals in the control and experimental groups, respectively.