Percentage of trials with a correct response during the last 3 baseline training sessions (combined) prior to surgery, and the first 5 post-surgical baseline recovery sessions. CRF, consistently reinforced cues; PRF, partially reinforced cues; VEH, vehicle (sham) lesion controls; CEA, lesions of amygdala central nucleus; MFC, lesions of medial prefrontal cortex; PPC, lesions of posterior parietal cortex.