Figure 4.

Experiment 2. a, Coronal sections of the actual and reconstructed lesions in monkeys A–C, who had disconnection of prefrontal and inferotemporal cortex by surgical section of the uncinate fascicle. b, Learning proficiency on each task is shown by the mean number of errors per set of visual discrimination problems; group means are shown by bars, and individual means are shown by letters. Letters correspond to each monkey's histologically verified lesions shown in a. Similar to the monkeys in experiment 1, these monkeys were impaired at associating two-item sequences of visual objects with reward (b, task 2I) but were not impaired at associating single items with reward after an unfilled delay (b, task UD), compared with their preoperative performance (unshaded bars). *p < 0.05.