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Personality, happiness, and health in gibbons
Alexander Weiss1, Michaela Masilkova2, Marieke C Gartner3
1Wildlife Research Center, Kyoto University.
Summary
Gibbon personality research reveals shared traits like Extraversion and Dominance across genera, suggesting early origins of Conscientiousness in hominoids and links to well-being.
Area of Science:
- Primate psychology
- Evolutionary anthropology
- Behavioral science
Background:
- Gibbons (family Hylobatidae) represent four genera: lar gibbons (Hylobates spp.), crested gibbons (Nomascus spp.), siamangs (Symphalangus syndactus), and hoolocks (Hoolock spp.).
- Their close relation to orangutans and unique phylogeny/socioecology offer insights into personality origins.
Purpose of the Study:
- To analyze personality trait structures in gibbons using exploratory factor analyses.
- To investigate the evolutionary timeline of personality factors, particularly Conscientiousness, within hominoids.
- To explore the relationship between personality traits and subjective well-being/health in gibbons.
Main Methods:
- Exploratory factor analyses were conducted on personality trait ratings from lar gibbons, crested gibbons, and siamangs.
- Combined data, including hoolocks, were analyzed to compare factor structures with orangutans.
- Informant ratings were used to assess subjective well-being and health.
Main Results:
- All analyzed gibbon genera exhibited factors of Dominance, Extraversion, and Agreeableness.
- Lar gibbons and siamangs showed Neuroticism and Conscientiousness; crested gibbons displayed Dyscontrol and Avoidance.
- Combined analysis revealed a Conscientiousness factor and four factors mirroring orangutan personality traits.
- Higher sociability, emotional stability, and conscientiousness correlated with better subjective well-being and health.
Conclusions:
- Social group size and/or arboreality appear to influence gibbon personality factor structure.
- Conscientiousness likely evolved in hominoids 16-20 million years ago, predating prior estimates.
- The link between personality and psychological/physical well-being in humans has ancient evolutionary roots.
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