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Ordinal judgments of numerical symbols by macaques (Macaca mulatta)Two rhesus monkeys (Macaca mulatta) learned that the arabic numerals 0 through 9 represented corresponding quantities of food pellets. By manipulating a joystick, the monkeys were able to make a selection of paired numerals presented on a computer screen. Although the monkeys received a corresponding number of pellets even if the lesser of the two numerals was selected, they learned generally to choose the numeral of greatest value even when pellet delivery was made arrhythmic. In subsequent tests, they chose the numerals of greater value when presented in novel combinations or in random arrays of up to five numerals. Thus, the monkeys made ordinal judgments of numerical symbols in accordance with their absolute or relative values.
Document ID
19920071652
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Washburn, David A.
(NASA Ames Research Center Moffett Field, CA, United States)
Rumbaugh, Duane M.
(Georgia State University Atlanta, United States)
Date Acquired
August 15, 2013
Publication Date
May 1, 1991
Publication Information
Publication: Psychological Science
Volume: 2
Issue: 3, Ma
Subject Category
Life Sciences (General)
Accession Number
92A54276
Funding Number(s)
CONTRACT_GRANT: NAG2-438
CONTRACT_GRANT: NIH-HD-06016
Distribution Limits
Public
Copyright
Other

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