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. It is usually associated with brain injury or neurological illness, particularly after damage to the temporal lobe.
Chronic Illness
Neurologic Manifestations :: Neurological Disorders

Agnosia - Information sheet compiled by the National Institute of Neurological Disorders and Stroke (NINDS).
Meta Description: [ Agnosia information page compiled by the National Institute of Neurological Disorders and Stroke (NINDS). ]
Agnosia - Nicole Redwine briefly describes the work of Dr. Oliver Sacks with a patient with the disorder.
An Examination of Visual Agnosia - Candace N. Palmer describes the condition and discusses treatment options. Includes references cited.
Face Blind - Author describes what it is like to have and live with this condition.
Meta Description: [ The world's only book about face blindness (prosopagnosia), the inability to tell people apart. ]
Prosopagnosia (Face Blindness) - The author explains this particular condition and how those afflicted use other techniques to recognize people.
Meta Description: [ Prosopagnosia, or face-blindness, is when you are unable to recognize other humans by their faces in spite of having good eye sight. This page explains what it can be like to try to recognize your friends with other brain centra than the one that is designed for it. ]
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Visual Agnosia - List of features for this disorder.
Visual Agnosia - Davidson College offers information on the various forms of the recognition disorder and describes rehabilitation and treatment.
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