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Abstracts of Presentations, Twenty-Second Annual Meeting, The American Society of Primatologists

Publisher: John Wiley and Sons
Year: 1999
Tongue: English
Weight: 157 KB
Volume: 49
Category: Article
ISSN: 0275-2565
DOI: 10.1002/(sici)1098-2345(1999)49:1<39::aid-ajp3>3.0.co;2-9

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✦ Synopsis

Numerous studies have been conducted to investigate whether or not non-human primates use perceptual concepts to categorize natural stimuli, such as other animals. These studies have presented evidence from squirrel monkeys, macaques, and capuchins for the use of concepts such as human, squirrel monkey, and kingfisher. It has been suggested that the results may be a consequence of stimulus generalization, or simple feature matching, rather than concepts. True categorization implies the existence of category boundaries, clearly distinguishing category members from non-category members. The present experiment used computerized morphed images to create a continuum of composite images derived from facial photographs of lions and wolves. Morphed images were paired with the original images and presented to five adult chimpanzees (Pan troglodytes) on a computer monitor interfaced with a touch-frame system. The chimpanzees responded to each pair using icons representing same and different. Responses to stimuli representing lions were significantly different from responses to stimuli representing wolves (p < .05), suggesting a discrete boundary between the two classes of images. These data suggest that chimpanzees may organize natural stimuli using bounded categories.

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