agnosia

agnosia /ag·no·sia/ (ag-no´zhah) inability to recognize the import of sensory impressions; the varieties correspond with several senses and are distinguished as auditory (acoustic), gustatory, olfactory, tactile, and visual.

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face agnosia , facial agnosia prosopagnosia.

finger agnosia  loss of ability to indicate one's own or another's fingers.

time agnosia  loss of comprehension of the succession and duration of events.

visual agnosia  inability to recognize familiar objects by sight, usually due to a lesion in one of the visual association areas.

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ag·no·sia (g-nzh)

n.

Loss of the ability to interpret sensory stimuli, such as sounds or images.

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agnosia

[ag·nō′zhə]

Etymology: Gk, a + gnosis, not knowledge

total or partial loss of the ability to recognize familiar objects or persons through sensory stimuli as a result of organic brain damage dementia. The condition may affect any of the senses and is classified accordingly as auditory, visual, olfactory, gustatory, or tactile agnosia. Also called agnosis. See also autotopagnosia.

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agnosia (agnō´zē, -zh),

n a loss of ability to recognize common objects (that is, a loss of ability to understand the significance of sensory stimuli e.g., tactile, auditory, or visual] resulting from brain damage).

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agnosia 

Inability to recognize the import of sensory stimuli (e.g. to recognize colour, faces, shape and the orientation of objects), although the receptors and the sensory pathway are intact. The condition is attributed to bilateral lesions in the association areas of the cortex. If the sense of sight is affected, it is called visual agnosia (perceptual or psychic blindness). See alexia; optical apraxia; prosopagnosia.

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agnosia

Neurology An inability to recognize sensory stimuli–objects, people, sounds, shapes or smells, common in parietal lobe tumors; agnosias are classified according to the sense affected–eg, touch–tactile agnosia, hearing—auditory agnosia, sight—visual agnosia, smell–olfactory agnosia, taste–gustatory agnosia. See Gustatory agnosia, Spatial agnosia, Visual agnosia.