Motor factor

In psychodynamics, motor factor is the amount of force or the measure of the demand for work which the pressure of an instinct represents. [1]

In 1915, Austrian psychologist Sigmund Freud, in his
“Instincts and their Vicissitudes”, was employing the term; likely on the model of the thermodynamic terms “motive force” or the earlier 1690 term motive power.

References
1. Freud, Sigmund. (1915). “Instincts and their Vicissitudes.” Standard Edition of The Complete Psychological Works of Sigmund Freud, Vol. 14. London: Hogarth Press Ltd.

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