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Does body posture influence hand preference in an ancestral primate model?

Marina Scheumann1, Marine Joly-Radko, Lisette Leliveld

  • 1Institute of Zoology, University of Veterinary Medicine Hannover, Bünteweg 17, D-30559 Hannover, Germany. marina.scheumann@tiho-hannover.de

BMC Evolutionary Biology
|March 2, 2011
PubMed
Summary

Primate handedness may not stem from posture. Mouse lemurs, an ancestral primate, primarily used their mouths for food, showing little hand preference, challenging existing theories on manual lateralization.

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Behavioral Assessment of Manual Dexterity in Non-Human Primates
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Published on: November 11, 2011

Area of Science:

  • Primate evolutionary biology
  • Behavioral ecology
  • Neuroscience

Background:

  • The evolutionary origins of human handedness and primate manual lateralization are debated.
  • Current hypotheses link handedness evolution to body posture, including postural origin and bipedalism hypotheses.
  • Gray mouse lemurs, considered a model for ancestral primates, were studied to investigate these theories.

Purpose of the Study:

  • To explore the origin of manual lateralization in primates using gray mouse lemurs.
  • To investigate hand preference in a natural foraging task.
  • To assess the influence of body posture on hand preference in a forced grasping task.

Main Methods:

  • Studied hand preference in gray mouse lemurs during a simple food grasping task.
  • Applied a forced food grasping task with varied postural demands (sit, biped, cling, triped) to assess postural influence.
  • Inhibited mouth usage to isolate hand preference.

Main Results:

  • Gray mouse lemurs did not show a population-level hand preference for food grasping.
  • Mouth-hand or mouth-alone retrieval was preferred over exclusive hand usage.
  • No influence of body posture on hand preference was observed in any task.
  • Individual, but not population-level, handedness emerged when mouth usage was inhibited.

Conclusions:

  • Results challenge current theories linking primate handedness to body posture.
  • Ecological adaptations, such as postural habits and body size, may be more critical for hand preference.
  • Small-bodied, arboreal primates like mouse lemurs exhibit less manual lateralization and prefer mouth-based food retrieval, contrasting with larger-bodied species.