Journal
JOURNAL OF COMPARATIVE PSYCHOLOGY
Volume 127, Issue 3, Pages 299-311Publisher
AMER PSYCHOLOGICAL ASSOC
DOI: 10.1037/a0031316
Keywords
personality; five-factor model; trait rating; Cebus capucinus
Funding
- Max Planck Institute for Evolutionary Anthropology
- National Science Foundation [SBR-0613226, BCS-0848360]
- L.S.B. Leakey Foundation
- National Geographic Society
- Direct For Social, Behav & Economic Scie [0848360] Funding Source: National Science Foundation
- Division Of Behavioral and Cognitive Sci [0848360] Funding Source: National Science Foundation
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Research on nonhuman primate personality dimensions has focused on a small number of taxa, and little of this work has focused on wild populations. We used ratings to assess personality structure in wild white-faced capuchins (Cebus capucinus) over a 9-year period, using a capuchin-specific rating instrument based partly on existing instruments. Adequate levels of interrater reliability were found for 24 of 26 items. A longitudinal analysis found that 15 of these items showed significant rank-order stability from adolescence through early adulthood. Principal components analysis revealed 5 components. Four of these components were recognizable Big Five dimensions: Extraversion (E), Openness (O), Neuroticism (N), and Agreeableness (A). A dimension incorporating aspects of high O and high Conscientiousness (C) was labeled Eccentricity. Every dimension except for N showed significant rank-order stability from adolescence through early adulthood. Males were more extraverted, open, neurotic, and eccentric than females, whereas females were more agreeable than males. A cross-sectional analysis revealed that openness and agreeableness declined, whereas eccentricity increased, during adulthood. The item content of capuchin Extraversion and Openness, and the existence of a distinctive Eccentricity dimension, are consistent with known characteristics of capuchin social and ecological adaptations, specifically the central roles of alliances, behavioral innovation, and social learning.
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