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Personality, happiness, and health in gibbons.

Alexander Weiss¹, Michaela Masilkova², Marieke C Gartner³

¹Wildlife Research Center, Kyoto University.

Journal of Comparative Psychology (Washington, D.C. : 1983)

|May 21, 2026

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.

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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.