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Sex differences in longitudinal personality stability in chimpanzees.
Bruce Rawlings1,2,3, Emma Flynn4, Hani Freeman3
1Durham Cultural Evolution Research Centre, Department of Anthropology, Durham University, UK.
Evolutionary Human Sciences
|August 17, 2023
Summary
Chimpanzee personality shows some stability over a decade, with dominance being highly consistent. However, other personality traits vary, emphasizing the need for current data in cognitive studies.
Area of Science:
- Primatology
- Comparative Psychology
- Behavioral Ecology
Background:
- Human personality research identifies stable traits analogous to the Big Five.
- Great apes exhibit similar personality structures, but long-term stability remains understudied.
- Factor-based personality instruments are crucial for reliable assessment.
Purpose of the Study:
- To assess the long-term stability of chimpanzee personality over a 10-year period.
- To investigate individual-level and group-level personality changes in chimpanzees.
- To examine sex differences in personality stability and trajectories.
Main Methods:
- Collected personality ratings for 50 chimpanzees.
- Compared current ratings with data from approximately 10 years prior.
- Utilized the same validated personality scale for both time points.
Main Results:
- Mean scores for three of six personality factors differed significantly between time points.
- Observed sex differences in three personality traits, with distinct trajectories for males and females in two traits.
- Dominance showed strong rank-order stability, while other factors had poor to moderate stability.
Conclusions:
- Chimpanzee personality, particularly dominance, demonstrates considerable long-term stability.
- Other personality factors exhibit variability, suggesting potential shifts over time.
- Current personality data are essential for accurate correlations with chimpanzee cognitive performance.
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