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Dissociations between perception and awareness in hemianopia.

Sylvie Chokron1, Lucas Dubourg2,1, Clémentine Garric3

  • 1Integrative Neuroscience and Cognition Center, CNRS, UMR 8242 et Université Paris-Descartes, Paris, France.

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|January 14, 2020
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Summary

Homonymous hemianopia (HH), a common visual defect, causes blindness in one visual field. This review explores HH

Keywords:
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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Cognitive Psychology

Background:

  • Homonymous hemianopia (HH) is the most frequent visual defect following retrochiasmal pathway lesions.
  • HH results in blindness to the contralesional visual field in each eye.
  • HH serves as a model for studying unilateral occipital lobe lesions and vision loss.

Purpose of the Study:

  • To review visual field losses in HH patients after unilateral occipital lesions.
  • To explore implications of perceptual-awareness dissociations in HH for visual processing models.
  • To discuss the relevance of HH for rehabilitation strategies.

Main Methods:

  • Literature review of studies on homonymous hemianopia.
  • Analysis of behavioral data and case reports concerning visual field defects.
  • Exploration of phenomena such as anosognosia, blindsight, sightblindness, and hallucinations in HH.

Main Results:

  • HH patients exhibit severe contralesional field deficits.
  • Dissociations between perception and awareness are common in HH, including anosognosia, blindsight, sightblindness, and unaware visual hallucinations.
  • Subtle ipsilesional field deficits can occur without patient awareness.

Conclusions:

  • HH is more than a simple visual field defect; it offers insights into perception-awareness dissociation.
  • Understanding these dissociations is crucial for developing effective rehabilitation strategies for HH.
  • HH provides a valuable model for investigating the complex relationship between visual processing and conscious awareness.