VII. Principles of Psychosomatic Physiology

The methodology of natural science denies any sort of existential independence to the will. Unlike feeling, willing is not even a signal of ideation. But this negative assumption, too, is simply based on a prior decision (cf. p. 15 of Physiological Psychology) to assign the whole of the psyche to neural process. Yet the plain fact is that what constitutes the peculiar quality of willing cannot really be related to neural process as such. Thus, precisely because of the exemplary clarity with which Ziehen develops the ideas from which he starts, he is forced (as anyone must be) to conclude that analysis of psychic processes in their relation to the life of the body “affords no support to the assumption of a specific faculty of will”.