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Decreased DA turnover was associated with hypomotility, and increased DA turnover with hypermotility. Decreased DA turnover was probably related aetiologically to the hypomotility: the symptoms subsided after replenishment of the DA deficiency. The relation between increased DA turnover and hypermotility is still under investigation. In view of the findings obtained, a plea is made for the development of a functional psychopathology, in which psychiatric syndromes are \u2018dissected\u2019 into their constituent psychological dysfunctions. This development is expected to stimulate human brain and behaviour research. 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