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Related Experiment Video

Updated: Jan 21, 2026

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Personality and lateralization in common marmosets (Callithrix jacchus).

Denise Tomassetti1, Simona Caracciolo1, Arianna Manciocco2

  • 1Center for Behavioural Sciences and Mental Health, Istituto Superiore di Sanità, Roma, Italy.

Behavioural Processes
|July 22, 2019
PubMed
Summary

A single personality factor, "Inquisitiveness," predicts hand preference strength in common marmosets. This finding highlights marmosets as a valuable primate model for studying personality and brain lateralization.

Keywords:
Brain lateralizationHand preferenceInter-individual behavioural differencesMixed-handednessOpennessPersonality factors

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Area of Science:

  • Primate behavior and cognition
  • Neuroscience and behavioral genetics
  • Comparative psychology

Background:

  • Hemispheric specialization influences behavior and personality.
  • Individual differences in personality and hand preference are well-documented.
  • Common marmosets exhibit stable hand preferences, making them suitable for research.

Purpose of the Study:

  • To investigate the relationship between personality traits and hand preference in common marmosets (Callithrix jacchus).
  • To identify major personality factors in marmosets and their association with behavioral lateralization.
  • To establish the common marmoset as a primate model for studying personality-lateralization links.

Main Methods:

  • Behavioral data from 56 species-specific behaviors were collected across 10 lab tests and social observations.
  • 16 adult marmosets were studied, with data aggregated into 13 personality traits.
  • Exploratory Factor Analysis (EFA) and multiple regression were used to analyze personality factors and hand preference, controlling for sex and age.

Main Results:

  • Common marmosets display stable and distinct personality profiles.
  • A single significant personality factor, termed "Inquisitiveness," emerged, explaining 38% of the variance.
  • Inquisitiveness, characterized by interest in novelty, significantly predicted the strength of hand preference.

Conclusions:

  • The study confirms stable personality structures in common marmosets.
  • "Inquisitiveness" is identified as a key personality trait linked to behavioral lateralization.
  • Common marmosets serve as a robust model for exploring the interplay between personality and brain lateralization in primates.