Conducted 2 experiments with 16 mongrel cats. Ss were trained on a time-discrimination task in which different periods of bodily confinement served as discriminanda for go-left-go-right responding. Lesions of gyrus proreus or the associated anteroventral part of nucleus caudatus impaired relearning in this situation. After reacquisition, Ss with caudate lesions received proreal ablations, and Ss with cortical damage received caudate lesions; both additional lesions caused reappearance of the deficit. The absence of external stimuli to signal locus of reinforcement at the moment of spatial choice may have been crucial for eliciting the deficit. The data support the notion that the prefrontal cortex and the anatomically related part of the caudate nucleus participate in similar behaviors. (39 ref) (PsycINFO Database Record (c) 2006 APA, all rights reserved)