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A vocabulary test for chimpanzees (Pan troglodytes)
Journal of Comparative Psychology (Washington, D.C. : 1983)
|December 1, 1984
Summary
Chimpanzees demonstrate communication skills by using American Sign Language (ASL) to name objects. Their signs accurately represent natural language categories, indicating cognitive abilities beyond simple mimicry.
Area of Science:
- Primate cognition
- Animal communication
- Comparative psychology
Background:
- Chimpanzees possess complex cognitive abilities.
- Investigating non-human primate communication is crucial for understanding language evolution.
- Cross-fostered chimpanzees offer unique insights into interspecies communication.
Purpose of the Study:
- To assess the capacity of chimpanzees to use American Sign Language (ASL) to name objects.
- To determine if chimpanzees name natural language categories.
- To analyze error patterns in chimpanzee ASL use.
Main Methods:
- Four cross-fostered chimpanzees (4-6 years old) participated in a vocabulary test.
- Chimpanzees were shown projected slides and responded using ASL.
- Two independent human observers, unaware of each other's observations, recorded the signs.
Main Results:
- Chimpanzees accurately signed the names of projected slides.
- Independent observers agreed on the signs, indicating reliable communication.
- Error analysis revealed that gestural form and conceptual category influenced sign accuracy.
Conclusions:
- Chimpanzees can reliably use ASL to name objects and demonstrate understanding of natural language categories.
- The findings suggest a sophisticated level of cognitive and communicative ability in chimpanzees.
- Error patterns provide insights into the underlying mechanisms of chimpanzee sign production.