Spontaneous class grouping behavior by bonobos ( Pan paniscus ) and common chimpanzees ( P. troglodytes )

Two experiments investigated spontaneous class grouping behavior by human-enculturated and language-reared bonobos (Pan paniscus) and common chimpanzees (P. troglodytes). In experiment 1, three chimpanzees ranging in age from 6 to 18 years were presented with six objects. The objects embodied three...

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Bibliographic Details
Published in:Animal cognition 1999-10, Vol.2 (3), p.157-170
Main Authors: Spinozzi, G., Natale, F., Langer, J., Brakke, K. E.
Format: Article
Language:English
Subjects:
Experiments
Monkeys & apes
Pan paniscus
Pan troglodytes
Troglodytes
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Summary:Two experiments investigated spontaneous class grouping behavior by human-enculturated and language-reared bonobos (Pan paniscus) and common chimpanzees (P. troglodytes). In experiment 1, three chimpanzees ranging in age from 6 to 18 years were presented with six objects. The objects embodied three conditions: additive, multiplicative and disjoint classes. All chimpanzees spontaneously produced single- and two-category classifying. In experiment 2, six chimpanzees ranging in age from 6 to 21 years were presented with 12 objects in the same class conditions. Chimpanzees mainly produced single-category classifying. Their two-category classifying was more rudimentary than that found in experiment 1. Chimpanzees did not produce any three-category classifying which would be necessary to construct the hierarchies that humans begin to construct during early childhood.[PUBLICATION ABSTRACT]
ISSN:1435-9448
1435-9456
DOI:10.1007/s100710050036