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Acalculia (acalculia; and - – otritsa. the lat is frequent +. calculo – to consider; synonym: a diskalkuliya) – disturbance of ability to consider (to perform arithmetic operations) which is caused by defeat by an occipital and parietal lobe of a dominant cerebral hemisphere.

Acalculia optical (acalculia optica) – disturbance of visual perception and reproduction of figures, similar in graphic structure. It is observed at defeats of occipital area of bark of big cerebral hemispheres.

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The most rare disease – a disease the Kura. Only representatives of the tribe Faure in New Guinea are ill it. The patient dies of laughter. It is considered that eating of a human brain is an origin of a disease.