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Influence of stimuli size on color discrimination in capuchin monkeys
Author(s) -
Gomes Úrsula R.,
Pessoa Daniel M.A.,
Suganuma Elisa,
Tomaz Carlos,
Pessoa Valdir F.
Publication year - 2005
Publication title -
american journal of primatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.988
H-Index - 81
eISSN - 1098-2345
pISSN - 0275-2565
DOI - 10.1002/ajp.20198
Subject(s) - trichromacy , color discrimination , color vision , primate , psychology , communication , biology , artificial intelligence , computer science , neuroscience
Large‐field trichromacy is a general feature of protanope and deuteranope humans, provided that the stimuli size extends to an 8° visual angle. In this study we compared the performance of five male and three female tufted capuchin monkeys ( Cebus apella ) in discriminating pairs of Munsell color papers. Human subjects were also studied in two‐choice discrimination tests, using the same stimuli and apparatus employed for the monkeys. The results show that although the dichromatic humans showed improved discrimination with larger versions of the stimuli, the dichromatic monkeys exhibited the same performance for both stimuli sizes. Thus, Cebus apella apparently do not present large‐field trichromacy‐at least for the conditions in the present experiments. Am. J. Primatol. 67:437–446, 2005. © 2005 Wiley‐Liss, Inc.