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Lemurs and macaques show similar numerical sensitivity |
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| Authors: | Sarah M. Jones John Pearson Nicholas K. DeWind David Paulsen Ana-Maria Tenekedjieva Elizabeth M. Brannon |
| Affiliation: | 1. Department of Psychology and Neuroscience, Duke University, Durham, NC, USA 5. Psychology Department, St. Norbert College, De Pere, WI, USA 2. Center for Cognitive Neuroscience, Duke University, Durham, NC, USA 3. Department of Neurobiology, Duke University Medical Center, Durham, NC, USA 4. Division of Neurosurgery, Duke University Medical Center, Durham, NC, USA |
| Abstract: | We investigated the precision of the approximate number system (ANS) in three lemur species (Lemur catta, Eulemur mongoz, and Eulemur macaco flavifrons), one Old World monkey species (Macaca mulatta) and humans (Homo sapiens). In Experiment 1, four individuals of each nonhuman primate species were trained to select the numerically larger of two visual arrays on a touchscreen. We estimated numerical acuity by modeling Weber fractions (w) and found quantitatively equivalent performance among all four nonhuman primate species. In Experiment 2, we tested adult humans in a similar procedure, and they outperformed the four nonhuman species but showed qualitatively similar performance. These results indicate that the ANS is conserved over the primate order. |
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