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Common marmoset (Callithrix jacchus) personality.

Sonja E Koski1, Hannah M Buchanan-Smith2, Hayley Ash2

  • 1Centre of Excellence in Intersubjectivity in Interaction, Department of Social Sciences, University of Helsinki.

Journal of Comparative Psychology (Washington, D.C. : 1983)
|October 13, 2017
PubMed
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Primate personality structures vary, with common marmosets exhibiting unique traits like patience. Cooperative breeding may influence the evolution of marmoset prosocial personality characteristics.

Area of Science:

  • Primate behavior and evolution
  • Comparative psychology
  • Animal personality

Background:

  • Personality structure varies across species, but evolutionary drivers remain unclear.
  • Previous research explored primate personality, necessitating further investigation into New World monkeys.

Purpose of the Study:

  • To examine personality structure in common marmosets (Callithrix jacchus).
  • To compare marmoset personality domains with those found in other primates.
  • To investigate sex and age differences in marmoset personality.

Main Methods:

  • Administered a 60-item questionnaire to 100 family-reared adult common marmosets across three colonies.
  • Utilized principal components analysis to identify personality domains.
  • Employed linear models to analyze sex and age effects on personality domains.

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Main Results:

  • Identified five personality domains, largely consistent with previous studies.
  • Four domains (conscientiousness, agreeableness, inquisitiveness, assertiveness) align with other nonhuman primates.
  • A unique domain, patience, was identified in common marmosets. Males scored lower in patience than females; older marmosets scored lower in inquisitiveness.
  • Sex and age influenced agreeableness scores, with specific patterns observed in younger/older males and females.

Conclusions:

  • Primate personality structures exhibit species-specific variations.
  • Cooperative breeding in common marmosets may have influenced the evolution of social cognition and prosocial personality traits.
  • The findings contribute to understanding the evolutionary basis of personality diversity in primates.