different between psychohydraulics vs psychohydraulic

English

psycho- +? hydraulics

psychohydraulics (uncountable)

(psychology) A mechanistic model of behaviour in which the effects of drives are interpreted as those of pressure on a fluid

psycho- +? hydraulic

psychohydraulic (not comparable)

(psychology) Describing a mechanistic model of behaviour in which the effects of drives are interpreted as those of pressure on a fluid.

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