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A stronger psychophysical excitement is necessary in order to secure the innervation of the big muscles in the central nervous system. This difference in the stimulation of the various muscle groups has been of significant consequence for the differentiation of work throughout the development of mankind.

So far, what we see is only another name for HOW we see; and the way of seeing has proved to contain enough to bring to stimulation and repose the psychophysical mechanism. But now we must ask, what relation has meaning to beauty? Is it an element, coordinate with others, or something superposed? or is it an end in itself, the supreme end?

When out of a despondent mood in a suggestible brain an absorbing emotion of confidence breaks through, a completely new equilibrium of the psychophysical system may indeed result. In such cases, improvements may set in which no sober physician can determine beforehand.

To this material we have to apply only that "natural persuasion of the ear" which we have already explained, to account for the full development of music. <1> Primitive Music, 1893, p. 156. The beauty of music, in so far as beauty is identical with pleasantness, consists in its satisfaction of the demands of the ear, and of the whole psychophysical organism as connected with the ear.

So far we presupposed that the central system itself was normal. No sharp separation line, however, lies between all these disturbances and the equally large group of psychophysical disabilities resulting from a defective constitution of the brain.

In a similar way emotions may be conditions of stimulation or interference, and no one ought to underestimate the importance of higher motives, intellectual, æsthetic, and moral motives, in their bearing on the psychophysical impulses of the laborer.

But for the average, which almost alone is in question for life in the factory, the consciousness of common effort is a source of psychophysical reinforcement. This evidently remains effective when the workingmen can see one another, even if the arrangement of the seats precludes the possibility of chatting during the work.

Yet the paralysis of the arm, for instance, which resulted from such a breaking of a blood-vessel in the brain may be to a high degree repaired by building up new motor images in the psychophysical system, which become starting points for a new learning of movements. The patient did not understand how to make the most out of those motor paths which had been left.

He calls attention to the abuse of the term "instincts" and himself defines an instinct as an inherited or innate psychophysical disposition which has the three aspects of all mental processes: the cognitive, the affective and the conative or a knowing of some object or thing, a feeling in regard to it, and a striving towards or away from that object.

In such a case it would indeed be sufficient to consider the psychophysical disturbance from the psychological point of view only, that is, to speak of the disease as a disorder of intellect, of emotion or will, without thinking of changes in the brain cells. But such isolation does not exist in nature.