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Effects of ectostriatal lesions on natural concept, pseudoconcept, and artificial pattern discrimination in pigeons

Published online by Cambridge University Press:  02 June 2009

Shigeru Watanabe
Shigeru Watanabe
Affiliation:
Department of Psychology, Keio University, Tokyo, Japan
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Abstract

Pigeons were trained on four different visual discrimination tasks: (1) concept of natural stimuli (food vs. non-food object discrimination); (2) arbitrary classification of natural stimuli (pseudoconcept); (3) concept of artificial stimuli (triangles generated by computer graphics); and (4) discrimination of one pair of artificial stimuli. Then, lesions of the ectostriatum were carried out. The ectostriatal lesions impaired the arbitrary classification of natural stimuli and the concept of artificial pattern but did not impair the natural concept or the simple discrimination of fixed two stimuli. Lesions in the neostriatum did not cause deficits in any discrimination task. The birds had to learn individual stimuli for the arbitrary classification of stimuli and the stimulus generalization test after the artificial pattern concept discrimination indicated that the pigeons formed a concept more complicated than “triangle” in human language. These results suggest that the ectostriatum plays a role in task discrimination that requires much visual processing to classify stimuli.

Keywords

ConceptPattern recognitionLesionEctostriatumPigeon
Type
Research Articles
Information
Visual Neuroscience , Volume 6 , Issue 5 , May 1991 , pp. 497 - 506
Copyright
Copyright © Cambridge University Press 1991

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