[Hallucinosis of advanced age].

The author studied different hallucinosis seen in patients of old age. By the clinical expression these hallucinoses were unlike the known forms of endogenous and exogenous psychoses and had no signs of cerebral organic destructive age changes. It was demonstrated that the different hallucinosis according to the organs of sense have some common signs: the character of correlations between hallucinosis and the petty delusions of persecution and prejudice; the correlation between perceptive illusions and lesions of the peripheral receptor apparatus; the possibility of a transformation of one type of hallucinosis into another; a common character of hereditary loading. The studied hallucinosis were attributed by the author to a group of functional psychoses of old age.