What is agnosia?

Agnosia is loss of ability to comprehend the meaning of sensory stimulation, such as auditory, visual, olfactory, tactile, and gustatory sensations.
auditory a. Inability to recognize different sounds; usually due to a lesion in the auditory cortex of the temporal lobe of the brain.
tactile a. Failure to recognize objects or to appreciate their form by touch; caused by a lesion in the contralateral parietal lobe of the brain.
visual a. Inability to recognize objects by sight; usually due to a lesion in the visual association areas of the brain.

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