Research output: Contribution to journal › Article › peer-review
Nonhuman great apes and human children were tested for an understanding that appearance does not always correspond to reality. Subjects were 29 great apes (bonobos [Pan paniscus], chimpanzees [Pan troglodytes], gorillas [Gorilla gorilla], and orangutans [Pongo abelii]) and 24 21/2-year-old children. In our task, we occluded portions of 1 large and 1 small food stick such that the size relations seemed reversed. Subjects could then choose which one they wanted. There was 1 control condition and 2 experimental conditions (administered within subjects). In the control condition subjects saw only the apparent stick sizes, whereas in the 2 experimental conditions they saw the true stick sizes as well (the difference between them being what the subjects saw first: the apparent or the real stick sizes). All great ape species and children successfully identified the bigger stick, despite its smaller appearance, in the experimental conditions, but not in the control. We discuss these results in relation to the understanding of object permanence and conservation, and exclude reversed reward contingency learning as an explanation.
Original language | English |
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Pages (from-to) | 431-439 |
Number of pages | 9 |
Journal | Journal of Comparative Psychology |
Volume | 128 |
Issue number | 4 |
DOIs | |
Publication status | Published - Nov 2014 |
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Research output: Contribution to journal › Article › peer-review
Research output: Contribution to journal › Article › peer-review
Research output: Contribution to journal › Article › peer-review
Research output: Contribution to journal › Article › peer-review
Research output: Contribution to journal › Article › peer-review
Manon Karin Schweinfurth (Member of editorial board)
Activity: Publication peer-review and editorial work types › Editor of research journal
Josep Call (Member of editorial board)
Activity: Publication peer-review and editorial work types › Editor of research journal
Josep Call (Editor)
Activity: Publication peer-review and editorial work types › Editor of research journal
Andrew Whiten (Member of editorial board)
Activity: Publication peer-review and editorial work types › Editor of research journal
Research output: Contribution to journal › Article › peer-review
Research output: Contribution to journal › Article › peer-review
Research output: Contribution to journal › Article › peer-review
Research output: Contribution to journal › Article › peer-review
Research output: Contribution to journal › Article › peer-review
ID: 160059429