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Sex differences in longitudinal personality stability in chimpanzees.

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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.