Studied the effects of stimulus redundancy, and number of alternative choices, on visual discrimination learning and retention in 3 monkeys with inferotemporal lesions and 3 normal controls. Intact Ss imposed constraints on the available information, which led to superior performance on both learning and retention tasks, but only when the amount of information to be processed was relatively great. (PsycINFO Database Record (c) 2006 APA, all rights reserved)