He describes at considerable length two patients in the Asylum of Alt-Scherbitz, one, which he calls a typical case of katatony, becoming finally dementia prócox; the other, a young student with hysterical convulsive attacks and hallucinatory states and delirium. Kaiser regards hysteria as an abnormal mental susceptibility of the nervous system, by which it becomes prone to yield either to outward suggestions or to fanciful notions formed within the mind of the patient. Through this hyper-suggestibility, whole association systems are diverted from their functions, and the activity of others heightened. The differential diagnosis between katatony and aggravated hysteria is stated to be, that in the former there is a childish mental weakness, a state of depression with few ideas, passing into dementia, which contrasts with the selfish caprice, cunning, and persistence of purpose in the hysterical patient.
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