Abstract
dJuvenile and adult orangutans (n = 5; Pongo pygmaeus), chimpanzees (n = 7; Pan troglodytes), and 19- and 26-month-old children (n = 24; Homo sapiens) received visible and invisible displacements. Three containers were presented forming a straight line, and a small box was used to displace a reward under them. Subjects received 3 types of displacement: single (the box visited I container), double adjacent (the box visited 2 contiguous containers), and double nonadjacent (the box visited 2 noncontiguous containers). All species performed at comparable levels, solving all problems except the invisible nonadjacent displacements. Visible displacements were easier than invisible, and single were easier than double displacements. In a 2nd experiment, subjects saw the baiting of either 2 adjacent or 2 nonadjacent containers with no displacements. All species selected the empty container more often when the baited containers were nonadjacent than when they were adjacent. It is hypothesized that a response bias and inhibition problem were responsible for the poor performance in nonadjacent displacements.
Original language | English |
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Pages (from-to) | 159-171 |
Number of pages | 13 |
Journal | Journal of Comparative Psychology |
Volume | 115 |
Issue number | 2 |
DOIs | |
Publication status | Published - Jun 2001 |
Keywords
- LONG-TAILED MACAQUES
- MONKEYS MACACA-MULATTA
- DOGS CANIS-FAMILIARIS
- CATS FELIS-CATUS
- INVISIBLE DISPLACEMENT
- SEARCH BEHAVIOR
- FASCICULARIS
- COGNITION
- QUANTITY
- CUES