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Articles Aphasia and Agnosia

Balints Syndrome
not an agnosia

Types
Total 24

Visual Agnosia
Visual agnosia is a broad category that refers to a deficiency in the ability to recognize visual objects. Visual agnosia can be further subdivided into two different subtypes: apperceptive agnosia and associative agnosia. Individuals with apperceptive agnosia display the ability to see contours and outlines when shown an object, but they experience difficulty if asked to categorize objects. Apperceptive agnosia is associated with damage to one hemisphere, specifically damage to the posterior sections of the right hemisphere. In contrast, individuals with associative agnosia experience difficulty when asked to name objects. Associative agnosia is associated with damage to both the right and left hemispheres at the occipitotemporal border. A specific form of associative agnosia is known as prosopagnosia. Prosopagnosia is the inability to recognize faces. For example, these individuals have difficulty recognizing friends, family and coworkers. However, individuals with prosopagnosia can recognize all other types of visual stimuli.

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