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The Visual Agnosias and Related Disorders
Sameen Haque1, Michael S Vaphiades, Christian J Lueck
1Department of Neurology (SH, CJL), The Canberra Hospital, Canberra, Australia; Departments of Ophthalmology (MV), Neurology, and Neurosurgery, University of Alabama, Birmingham, Alabama; and Australian National University Medical School (CJL), Canberra, Australia.
Disorders of higher visual processing stem from damage to the ventral ("what?") or dorsal ("where?") visual pathways. Recent research enhances understanding of these visual agnosias and their cortical origins.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Ophthalmology
Background:
- Higher visual processing involves distinct cortical areas.
- Disorders can affect the ventral ("what?") or dorsal ("where?") visual pathways.
- Examples include object agnosia, achromatopsia, prosopagnosia, akinetopsia, and optic ataxia.
Purpose of the Study:
- To review current understanding of higher cerebral visual processing.
- To discuss various visual processing disorders.
- To highlight recent advancements in basic science and patient studies.
Main Methods:
- Literature review
- Focus on recent basic science research
- Analysis of individual patient studies
Main Results:
- Overview of higher cerebral visual processing.
- Discussion of specific visual processing disorders.
- Progress in understanding extrastriate cortex organization.
Conclusions:
- Significant progress in understanding extrastriate visual cortex organization.
- Improved comprehension of functionally specialized visual areas.
- Better understanding of visual agnosias resulting from cortical damage.
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