Hyperstriatal function in the pigeon: Response inhibition or response shift?

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Conducted 2 experiments with a total of 32 pigeons to further investigate the behavioral role played by the avian hyperstriatal complex. Results of Exp I show that Ss with lesions of the anterior or posterior hyperstriatum were impaired relative to unoperated controls and to control operates having neostriatal lesions on both acquisition and reversal of a simultaneous position discrimination. The observation that hyperstriatal Ss showed more tendency than controls to halt responding altogether in this situation casts doubt on the notion that the reversal deficit was due to a loss of response inhibition. Results of Exp II support an alternative hypothesis, i.e., that hyperstriatal birds have a deficit in the ability to shift responding to an alternative stimulus as a consequence of nonreinforcement. (22 ref) (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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