Hyperstriatal lesions in pigeons: Effects on response inhibition, behavioral contrast, and reversal learning.

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Abstract
Studied the effects of bilateral hyperstriatal lesions in 7 pigeons (Columba livia), in comparison with 4 sham-operated and 4 unoperated controls. Exp. I measured the effect of these lesions on performance in negative and positive components of a successive discrimination, using free-operant techniques. Compared with controls, lesioned Ss were significantly impaired in their ability to inhibit responding in negative components; however, behavioral contrast, measured in positive components, was not reduced. In Exp. II, lesioned Ss were impaired over a series of 6 reversals of a simultaneous position discrimination, but not on its acquisition. It is concluded that hyperstriatal lesions in pigeons cause a general deficit in the ability to withhold responses as a consequence of nonreward, but that this deficit is probably not the result of a reduced emotional response to nonreward. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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