Michael J. Beran, Ph.D.
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Last updated: 
September 1, 2021

 

 

Beran, M. J. (2010). Use of exclusion by a chimpanzee (Pan troglodytes) during speech perception and auditory-visual matching-to-sample. Behavioural Processes, 83, 287-291.

An adult female chimpanzee showed responding through use of exclusion in an auditory to visual matching-to-sample procedure. The chimpanzee had previously learned to associate specific visuographic symbols called lexigrams with real world referents and the spoken English words and photographs for those referents. On some trials, an unknown spoken English word was presented as the sample, and the match choices could consist of photographs or lexigrams that already were associated with known English words as well as unknown lexigrams or photos of objects without associated lexigrams. The chimpanzee reliably avoided choosing known comparisons for these unknown samples, instead relying on exclusion to choose comparisons that were of unknown lexigrams or photographs of items without associated lexigram symbols.

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