Abstract # 122:

Scheduled for Friday, August 19, 2005 11:05 AM-11:25 AM: Session 9 (Crystal Ballroom) Oral Presentation

The generalizability of chimpanzee (Pan troglodytes) personality across two habitats: Zoological parks and Yerkes National Primate Research Center

A. Weiss1, J. E. King2 and W. D. Hopkins3
1Laboratory of Personality and Cognition, National Institute on Aging, NIH, DHHS, 5600 Nathan Shock Drive, Baltimore, MD 21224, USA, 2Department of Psychology, University of Arizona, 3Division of Psychobiology, Yerkes National Primate Research Center
     We examined whether factor structure and age and sex differences generalized from a sample of 202 zoo chimpanzees to 187 chimpanzees in Yerkes National Primate Research Center. Individuals familiar with the chimpanzees completed the Chimpanzee Personality Questionnaire. Interrater reliability was good in both samples, though better at zoos. We used a targeted Procrustes rotation to compare six factor solutions for each sample. Five factors generalized across habitats. These five factors were extracted and labeled Dominance, Extraversion, Excitability, Agreeableness, and Competence. We used a GLM to test for age, sex, and habitat effects. The GLM also tested the generalizability of age and sex effects across habitats by including the interaction of habitat with age, sex, and the age-by-sex interaction. Significant main effects (all P values < .05) indicated that males had higher Excitability scores than females; age was related positively to Dominance and Agreeableness, but negatively to Extraversion; and Yerkes chimpanzees had higher Dominance, but lower Extraversion and Agreeableness scores than zoo chimpanzees. Significant interaction effects (all P values < .05) indicated that Dominance was positively related to age at zoos, but not Yerkes and that Competence was negatively related to age at Yerkes, but not zoos. Another significant interaction indicated that the sex differences in Excitability were nearly twice as large at Yerkes. Thus, while there were some differences, chimpanzee personality largely generalizes across different habitats.