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Related Experiment Videos

Behavioral laterality in captive bonobos (Pan paniscus)

W D Hopkins1, A J Bennett, S L Bales

  • 1Yerkes Regional Primate Research Center, Emory University, Atlanta, Georgia 30322.

Journal of Comparative Psychology (Washington, D.C. : 1983)
|December 1, 1993
PubMed
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Bonobos (Pan paniscus) exhibit behavioral laterality, with posture influencing limb bias. Bipedal stances enhanced lateral biases in carrying and limb use during feeding tasks.

Area of Science:

  • Primate Ethology
  • Comparative Psychology
  • Behavioral Neuroscience

Background:

  • Understanding behavioral laterality in non-human primates provides insights into the evolution of handedness and brain lateralization.
  • Previous studies on primate laterality have yielded varied results, necessitating further investigation into factors influencing observed biases.

Purpose of the Study:

  • To investigate behavioral laterality in bonobos (Pan paniscus) across different motor tasks and postural conditions.
  • To determine if bipedal posture influences the direction or strength of observed lateral biases in bonobos.

Main Methods:

  • Observational study of 11 captive bonobos assessing carrying and leading limb biases.
  • Experimental manipulation of posture (bipedal vs. quadrupedal) during bimanual feeding tasks.

Related Experiment Videos

  • Analysis of lateral bias in feeding, face touching, self-touching, and gestures.

    • Main Results:

    • Significant left lateral bias in carrying and right lateral bias in leading limb observed.
    • Bipedal posture enhanced lateral biases for carrying and leading limbs.
    • Right-hand preference for eating when food was held with the left hand; increased right-hand use in bipedal posture during experimental tasks.

    Conclusions:

    • Bonobos display distinct behavioral laterality patterns, particularly influenced by postural demands.
    • The findings suggest that bipedalism may play a role in modulating limb lateralization in bonobos.
    • Laterality in bonobos is task- and posture-dependent, with no observed bias in social gestures or self-directed behaviors.