Journal
JOURNAL OF COMPARATIVE PSYCHOLOGY
Volume 122, Issue 1, Pages 52-61Publisher
AMER PSYCHOLOGICAL ASSOC
DOI: 10.1037/0735-7036.122.1.52
Keywords
ordinality; capuchin monkeys; rhesus monkeys; Cebus apella; Macaca mulatta
Funding
- NICHD NIH HHS [HD-38051] Funding Source: Medline
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Ordinal learning was investigated in capuchin monkeys (Cebus apella) and rhesus monkeys (Macaca mulatta). In Experiment 1, both species were presented with pairings of the Arabic numerals 0 to 9. Some monkeys were given food rewards equal to the value of the numeral selected and some were rewarded with a single pellet only for choosing the higher numeral within the pair. Both species learned to select the larger numeral, but only rhesus monkeys that were differentially rewarded performed above chance levels when presented with novel probe pairings. In Experiment 2, the monkeys were first presented with arrays of 5 familiar numerals (from the range 0 to 9) and then arrays of 5 novel letters (from the range A to J) with the same reward outcomes in place as in Experiment 1. Both species performed better with the numerals, suggesting that an ordinal sequence of all stimuli had been learned during Experiment 1, rather than a matrix of two-choice discriminations.
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