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Inversion effect for faces in split-brain monkeys

B A Vermeire1, C R Hamilton

  • 1Human Anatomy and Medical Neurobiology, College of Medicine, Texas A&M University Health Science Center, College Station 77843-1114, USA. chamilton@tamu.edu

Neuropsychologia
|December 9, 1998
PubMed
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Inverted faces disrupt recognition in monkeys, particularly in the right hemisphere, similar to humans. This suggests monkeys process faces holistically, but can adapt to feature-based recognition when needed.

Area of Science:

  • Neuroscience
  • Comparative Psychology
  • Cognitive Science

Background:

  • Facial stimuli inversion severely impacts human recognition, more so in the right hemisphere.
  • The right hemisphere is dominant for face processing in humans.

Purpose of the Study:

  • To investigate the extent of facial stimuli inversion effects in monkeys.
  • To compare face processing mechanisms between human and rhesus monkey hemispheres.

Main Methods:

  • Twenty split-brain rhesus monkeys relearned eight facial discriminations with each hemisphere.
  • Inverted facial discriminations were presented after upright learning.
  • Performance differences between hemispheres for upright and inverted faces were analyzed.

Main Results:

Related Experiment Videos

  • Monkeys showed a right hemispheric advantage for upright facial recognition, mirroring human findings.
  • This right hemispheric advantage disappeared when processing inverted facial stimuli.
  • Both hemispheres could learn inverted facial discriminations, but without a performance bias.

Conclusions:

  • Monkeys exhibit a greater inversion effect for faces in the right hemisphere compared to the left, similar to humans.
  • This indicates monkeys typically process faces using holistic, right-hemisphere mechanisms.
  • Monkeys can switch to piecemeal, feature-based processing in either hemisphere when stimuli demand it.