VII. Principles of Psychosomatic Physiology

But in the nerves something else goes on that is quite distinct from metabolism and rhythm. The somatic processes in the nervous system which provide the foundation for representation and ideation are physiologically difficult to grasp. That is because, wherever there is neural function, it is accompanied by the ideation which is ordinary consciousness. But the converse of this is also true. Where there is no ideation, there it is never specifically neural function we discern, but only metabolic activity in the nerve; or rhythmic occurrence in it, as the case may be. Neurology will never arrive at concepts that measure up to the facts, so long as it fails to see that the specifically neural activity of the nerves cannot possibly be an object of physiologically empirical observation. Anatomy and Physiology must bring themselves to recognise that neural function can be located only by a method of exclusion. The activity of the nerves is precisely that in them which is not perceptible by the senses, though the fact that it must be there can be inferred from what is so perceptible, and so can the specific nature of their activity. The only way of representing neural function to ourselves is to see in it those material events, by means of which the purely psycho-spiritual reality of the living content of ideation is subdued and devitalised (herabgelähmt) to the lifeless representations and ideas we recognise as our ordinary consciousness. Unless this concept finds its way somehow into physiology, physiology can have no hope of explicating neural activity.