Agnosia is a cognitive disorder resulting from damage to the brain that disrupts the processing of sensory information through a single sensory modality (e.g., vision, hearing, touch). Heinrich Lissauer, a German neurologist, first described agnosia in 1890 as falling into two types, apperceptive and associative agnosia. Apperceptive agnosia is a rare form that results from disturbances in the early stages of perception. For example, the patient cannot integrate and synthesize discrete parts into a whole, draw, or match the stimulus to another. The more common type is associative agnosia resulting from a disconnection of the patient’s information stores about the stimulus needed to interpret the incoming sensory stimulus accurately.

In this more common form of agnosia, patients may be able to describe the object in detail, ...

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