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Behavioral Assessment of Manual Dexterity in Non-Human Primates
Published on: November 11, 2011
Chimpanzees solve the trap problem when the confound of tool-use is removed
Amanda M Seed1, Josep Call, Nathan J Emery
1Department of Experimental Psychology, University of Cambridge, UK. seed@eva.mpg.de
Journal of Experimental Psychology. Animal Behavior Processes
|January 23, 2009
Summary
Chimpanzees can solve the trap-tube problem when tools are removed, suggesting tools hinder their cognitive abilities. This indicates chimpanzees focus on functional properties rather than arbitrary cues.
Area of Science:
- Cognitive Ethology
- Animal Cognition
- Primate Behavior
Background:
- The trap-tube problem is a complex cognitive task that has historically proven difficult for chimpanzees.
- Previous studies suggest limited success rates, with few individuals mastering the problem, potentially due to methodological factors.
Purpose of the Study:
- To investigate if the inclusion of a tool in previous trap-tube problem tests masked chimpanzees' problem-solving abilities.
- To explore the impact of tool presence on chimpanzee performance in a modified trap-tube task.
Main Methods:
- Eight chimpanzees were tested on a non-tool-using version of the trap-tube problem.
- A separate experiment involved 15 chimpanzees in a 2x2 design, varying tool inclusion and prior experience with a similar task.
- Analysis of Variance (ANOVA) was used to assess the effects of tool inclusion and experience.
Main Results:
- All eight chimpanzees successfully learned to avoid the trap within 40 to 100 trials in the non-tool version.
- One chimpanzee demonstrated transfer learning to tasks lacking common visual cues.
- ANOVA revealed significant effects of both tool inclusion and prior experience on performance (p < .05).
Conclusions:
- The presence of a tool significantly impacts chimpanzees' ability to solve the trap-tube problem.
- Chimpanzees appear to encode functional properties of the task rather than relying on arbitrary cues.
- This suggests a more nuanced understanding of chimpanzee cognition in problem-solving scenarios.
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