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Related Experiment Video

Updated: Feb 22, 2026

Behavioral Assessment of Manual Dexterity in Non-Human Primates
16:00

Behavioral Assessment of Manual Dexterity in Non-Human Primates

Published on: November 11, 2011

23.1K

Manual function and performance in humans, gorillas, and orangutans during the same tool use task.

Ameline Bardo1,2, Raphaël Cornette3, Antony Borel4

  • 1Paris Descartes University, Sorbonne Paris Cité, Paris 75006, France.

American Journal of Physical Anthropology
|September 24, 2017
PubMed
Summary

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Humans exhibit superior manual dexterity compared to gorillas and orangutans, utilizing complex grips and movements for tool use. This highlights unique human manipulative abilities and the influence of hand anatomy and locomotion on dexterity.

Area of Science:

  • Primate comparative anatomy
  • Evolution of manual dexterity
  • Primate behavior and cognition

Background:

  • Humans possess advanced manual abilities, but comparisons with other primates, particularly great apes, remain limited.
  • Understanding primate manual function is crucial for insights into human evolution and cognitive development.

Purpose of the Study:

  • To compare manual function and performance in humans, gorillas, and orangutans during a tool-use task.
  • To investigate species-specific differences in manipulative strategies and their underlying mechanisms.

Main Methods:

  • Comparative study involving 20 humans, 6 gorillas, and 7 orangutans.
  • Standardized experimental tool-use task (food collection from a maze) under unconstrained posture.
  • Quantification of manual techniques and task performance metrics.
Keywords:
graspinghominidsmanipulationmaze taskperformance

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Last Updated: Feb 22, 2026

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Main Results:

  • Significant differences in manual techniques observed: humans used bimanual precision grips and in-hand movements; gorillas used unimanual grips; orangutans employed varied strategies (hand/mouth).
  • Humans outperformed gorillas and orangutans in task completion, demonstrating superior speed and efficiency.
  • Species-specific manual dexterity correlates with distinct anatomical and behavioral adaptations.

Conclusions:

  • Human manual dexterity is distinct from that of gorillas and orangutans, influenced by hand morphology and biomechanics.
  • Orangutan manipulative function is notably different, suggesting unique evolutionary pathways.
  • Terrestrial locomotion may facilitate the development of complex manual manipulation skills.