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Consciousness of perception after brain damage

M J Farah1, T E Feinberg

  • 1Department of Psychology, University of Pennsylvania, Philadelphia 19104, USA.

Seminars in Neurology
|June 1, 1997
PubMed
Summary

Brain damage can cause visual perception disorders, dissociating perception from consciousness. These conditions suggest consciousness and brain function may not rely on a single mechanism or system.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Philosophy of Mind

Background:

  • Disturbances in visual perception following brain damage offer insights into consciousness and brain function.
  • Several visual disorders demonstrate a dissociation between perception and consciousness.

Purpose of the Study:

  • To review six visual disorders where perception and consciousness are dissociated due to brain damage.
  • To examine these disorders through the lens of three major theories of consciousness and the brain.

Main Methods:

  • Review of six visual disorders: blindsight, apperceptive visual agnosia, prosopagnosia, neglect and extinction, pure alexia, and associative visual agnosia.
  • Analysis from the perspectives of localized consciousness, integrated information, and graded representation theories.

Main Results:

  • The reviewed visual syndromes do not appear to share a single underlying mechanism.
  • Multiple explanations may be required to account for these dissociations, both within and across different syndromes.

Conclusions:

  • Current evidence suggests that conscious awareness of perception likely involves brain systems that also contribute to perception itself.
  • It is improbable that a distinct brain system is solely responsible for conscious awareness without participating in perceptual processing.

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