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Chimpanzee (Pan Troglodytes) Counting In A Computerized Testing Paradigm, Michael J. Beran, Duane M. Rumbaugh, E. Sue Savage-Rumbaugh

Language Research Center

Using computer-mediated joystick manipulation, the ability of a common chimpanzee(Pan troglodytes) to select arrays of items equal to a given target number was examined. A random dot condition was included in which all sequence cues were eliminated as a means to reach the target numbers 1 to 4. The participant, Austin, had only the quantity of items already selected as a record of how high the count had progressed. Performance on the random dot trials was found to be significantly above chance and improvement over time was also statistically significant. Results of this experiment provide evidence that Austin behaved …