Abstract # 4428 Event # 211:

Scheduled for Friday, June 21, 2013 11:15 AM-11:30 AM: Session 26 (San Geronimo Ballroom B) Oral Presentation


HIGHER ORDER PERSONALITY DIMENSIONS IN WILD CEBUS CAPUCINUS AT LOMAS BARBUDAL, COSTA RICA

J. H. Manson and S. Perry
University of California, Los Angeles, Department of Anthropology, Los Angeles, CA 90095-1553, USA
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     Little is known about personality structure in wild primate populations studied over multi-year periods. We recently used principal component analysis (PCA) of ratings of 240 wild white-faced capuchins on 24 items by 51 trained observers and discovered support for a five-factor model: Extraversion (Ex), Openness (O), Neuroticism (N), Agreeableness (A) and Eccentricity (Ec). Among adults, O and A decreased with age whereas Ec increased. Here, we use PCA to determine whether higher-order dimensions of variation, possibly analogous to the human Alpha (positive Agreeableness, Conscientiousness, and Emotional Stability) and Beta (positive Extraversion and Openness) dimensions, or the General Factor of Personality (GFP), can be extracted from our capuchin data. Regardless of whether or how age-related variation was controlled, a Beta-like dimension emerged with positive loadings of >0.45 for Ex and O. Depending on analytical technique, this dimension sometimes included positive loadings of N or Ec. A second, Alpha-like dimension always included a positive loading (>0.64) of A, and sometimes a negative loading of N or Ec and a positive loading of O. No analytical technique revealed convincing evidence for a GFP. Males scored higher than females on Beta (t-test, p < 0.001), whereas females scored higher than males on Alpha (p < 0.001). The divergent life history strategies of white-faced capuchin males and females may preclude the evolution of a single higher-order personality factor.