Calculations, Right–Left Confusion, Finger Agnosia, Agraphia

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Impairment of all four of these functions in an otherwise intact patient is referred to as Gerstmann's syndrome. Since Gerstmann's syndrome is caused by lesions in the dominant parietal lobe, aphasia is often (but not always) present as well, which can make the diagnosis difficult or impossible. Each of the individual components of Gerstmann's syndrome is poorly localizing on its own, but they are worth documenting as part of the assessment of overall cognitive function:

Calculations. Can the patient do simple addition, subtraction, and so on?

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