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Related Experiment Videos

Preserved object recognition and reading comprehension in optic aphasia.

H B Coslett1, E M Saffran

  • 1Department of Neurology, Temple University School of Medicine, Philadelphia, PA.

Brain : a Journal of Neurology
|August 1, 1989
PubMed
Summary

Optic aphasia, a naming disorder, may not stem from visual recognition issues. This suggests the right hemisphere

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Linguistics

Background:

  • Optic aphasia is defined by impaired naming of visually presented objects.
  • It is often classified as a mild form of visual agnosia.
  • The condition is typically attributed to a disconnection between visual input and object semantics.

Observation:

  • A patient with optic aphasia could name objects via description and palpation.
  • The patient demonstrated comprehension of written words.
  • Despite these abilities, the patient could not name visually presented objects.

Findings:

  • The patient accessed semantic information for objects they could not visually name.
  • This suggests that visual recognition was intact.
  • The findings challenge the traditional view of optic aphasia as solely a visual agnosia subtype.

Implications:

  • Optic aphasia may arise from specific naming pathway disruptions, not general visual recognition deficits.
  • Preserved semantic access and reading comprehension suggest intact conceptual knowledge.
  • The right hemisphere may play a crucial role in supporting the semantic system in such cases.

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