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. It is usually associated with brain injury or neurological illness, particularly after damage to the temporal lobe.

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Agnosia
Information sheet compiled by the National Institute of Neurological Disorders and Stroke (NINDS).
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