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Behavioral Assessment of Manual Dexterity in Non-Human Primates
Published on: November 11, 2011
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Chimpanzees and bonobos differ in intrinsic motivation for tool use
Kathelijne Koops1,2, Takeshi Furuichi3, Chie Hashimoto3
1Anthropological Institute and Museum, University of Zurich, Winterthurerstrasse 190, 8057 Zürich, Switzerland.
Scientific Reports
|June 17, 2015
Summary
Chimpanzee tool use stems from intrinsic predispositions, not environment. This contrasts with bonobos and offers insights into early human technological evolution.
Area of Science:
- Primate behavior
- Evolutionary anthropology
- Comparative psychology
Background:
- Tool use in nonhuman apes provides insights into hominin technological evolution.
- Chimpanzees exhibit extensive tool use, while bonobos use tools infrequently, particularly in foraging.
- Understanding these differences can illuminate the origins of human technological behaviors.
Purpose of the Study:
- To investigate whether extrinsic factors (ecological, social opportunities) or intrinsic factors (predispositions) explain the difference in tool use between chimpanzees and bonobos.
- To compare tool use behaviors and related predispositions in chimpanzees and bonobos.
- To identify the evolutionary drivers of tool use in hominins.
Main Methods:
- Compared tool use and object manipulation between chimpanzees (Kalinzu, Uganda) and bonobos (Wamba, DRC).
- Assessed ecological opportunities by evaluating the availability of resources requiring tool use.
- Examined social learning opportunities in immature apes.
- Investigated intrinsic predispositions by measuring object manipulation and object play.
Main Results:
- Extrinsic factors (ecological and social opportunities) did not account for the observed differences in tool use.
- Intrinsic predispositions, specifically object manipulation and play, differed significantly between the two species.
- Chimpanzees demonstrated higher levels of object manipulation and play compared to bonobos, irrespective of social context.
Conclusions:
- Intrinsic predispositions, rather than extrinsic opportunities, are key factors explaining the divergence in tool use between chimpanzees and bonobos.
- The findings suggest that selection for increased intrinsic motivation for object manipulation played a crucial role in the evolution of hominin tool use.
- Comparative studies of ape behavior are vital for understanding the evolutionary trajectory of human technological capabilities.
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