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Encyclopedia > Visual agnosia

Visual agnosia is the inability of the brain to make sense of or make use of some part of otherwise normal visual stimulus, and is typified by the inability to recognize familiar objects or faces. This is distinct from blindness, which is a lack of sensory input to the brain due to damage to the eye or optic nerve. Visual agnosia is often due to damage, such as stroke, in posterior parietal lobe in the right hemisphere of the brain. The specific symptoms can vary depending on the cause of the agnosia. Some sufferers are unable to copy drawings, but are able to manipulate objects with good dexterity.[1] Commonly patients can describe objects in their visual field in great detail, including such aspects as color, texture, and shape, but are unable to recognize them. Similarly, patients can often describe familiar objects from memory despite their visual problems. [2] Deviesh has a big head but. ... This article or section does not cite its references or sources. ... This article or section does not cite its references or sources. ... The optic nerve is the nerve that transmits visual information from the retina to the brain. ... Agnosia (a-gnosis, non-knowledge) is a loss of ability to recognize objects, persons, sounds, shapes or smells while the specific sense is not defective nor is there any significant memory loss. ...


The careful analysis of the nature of visual agnosia has led to improved understanding of how normal vision works.


See also

This article or section does not cite its references or sources. ... Headline text COLOR AGNOSIA http://nanonline. ... Kluver-Bucy syndrome is a behavioral disorder that occurs when both the right and left medial temporal lobes of the brain malfunction. ...

References

  1.   http://ahsmail.uwaterloo.ca/kin356/ventral/visual_agnosia.htm
  2.   http://hubel.sfasu.edu/courseinfo/SL02/visual_agnosia.htm
  3. The Cognitive Neuroscience of Vision ISBN 0631214038

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  Results from FactBites:
 
Agnosia - Wikipedia, the free encyclopedia (642 words)
Agnosia (a-gnosis, "non-knowledge", or loss of knowledge) is a loss of ability to recognize objects, persons, sounds, shapes or smells while the specific sense is not defective nor is there any significant memory loss.
Visual agnosia is associated with lesions of the left occipital lobe and temporal lobes.
It may be object agnosia for specific faces or a specific face perception disorder.
  More results at FactBites »

 
 

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