Figure 4.

Individual subject data in scene learning. The dependent measure is the mean percentage error on trials 2–8 of each list of new scenes (performance in trial 1 is at chance for each list, because it is the first time monkeys have encountered the scenes, and they must discover the rewarded object by trial and error). The four control monkeys show stable performance between preoperative and postoperative performance tests; each monkey with an orbital prefrontal lesion is impaired relative to its preoperative performance.