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Do Social Conditions Affect Capuchin Monkeys' (Cebus Apella) Choices In A Quantity Judgment Task?, Michael J. Beran, Bonnie M. Perdue, Audrey E. Parrish, Theodore A. Evans

Language Research Center

Beran et al. (2012) reported that capuchin monkeys closely matched the performance of humans in a quantity judgment test in which information was incomplete but a judgment still had to be made. In each test session, subjects first made quantity judgments between two known options. Then, they made choices where only one option was visible. Both humans and capuchin monkeys were guided by past outcomes, as they shifted from select- ing a known option to selecting an unknown option at the point at which the known option went from being more than the average rate of return to less than …