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Laterality for visual-spatial processing in two language-trained chimpanzees (Pan troglodytes).

W D Hopkins1, R D Morris

  • 1Department of Psychology, Georgia State Univesity, Atlanta 30303.

Behavioral Neuroscience
|April 1, 1989
PubMed
Summary
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Laterality in chimpanzees was studied using visual tasks. One chimpanzee showed faster reactions to left visual field stimuli, while the other showed a left visual field bias with their left hand.

Area of Science:

  • Neuroscience
  • Primatology
  • Cognitive Science

Background:

  • Hemispheric asymmetries are not typically evident in nonhuman primates.
  • Apes show cognitive processes related to language and are phylogenetically similar to humans.
  • Chimpanzees are suitable candidates for studying laterality.

Purpose of the Study:

  • To investigate laterality for visual-spatial processing in language-trained chimpanzees.
  • To explore the relationship between visual-spatial processing, handedness, and cognitive functions in chimpanzees.

Main Methods:

  • A visual half-field paradigm was employed with two language-trained chimpanzees (Pan troglodytes).
  • Chimpanzees were trained to control a joystick and perform a visual discrimination task.
  • Stimuli were presented to the left and right visual fields at varying rates (15, 122, 226 ms).

Related Experiment Videos

  • Responses were made with either the left or right hand, measuring accuracy and reaction time.

    • Main Results:

    • One chimpanzee exhibited significantly faster reaction times to stimuli presented in the left visual field (LVF), irrespective of the hand used.
    • The second chimpanzee demonstrated a significant LVF bias specifically when responding with the left hand.

    Conclusions:

    • The findings suggest the presence of visual-spatial laterality in chimpanzees, potentially linked to cognitive functions.
    • Results contribute to understanding the evolution of laterality and its connection to linguistic capabilities in primates.