Rhesus macaques (Macaca mulatta) monitor uncertainty during numerosity judgments

Journal of Experimental Psychology. Animal Behavior Processes
Michael J BeranDavid A Washburn

Abstract

Two rhesus macaques (Macaca mulatta) judged arrays of dots on a computer screen as having more or fewer dots than a center value that was never presented in trials. After learning a center value, monkeys were given an uncertainty response that let them decline to make the numerosity judgment on that trial. Across center values (3-7), errors occurred most often for sets adjacent in numerosity to the center value. The monkeys also used the uncertainty response most frequently on these difficult trials. A 2nd experiment showed that monkeys' responses reflected numerical magnitude and not the surface-area illumination of the displays. This research shows that monkeys' uncertainty-monitoring capacity extends to the domain of numerical cognition. It also shows monkeys' use of the purest uncertainty response possible, uncontaminated by any secondary motivator.

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Citations

Dec 14, 2011·Psychological Research·Dennis RüngerPeter L Strick
Apr 18, 2007·Animal Cognition·Chikako Suda-King
Jun 16, 2009·Animal Cognition·J David SmithDavid A Washburn
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