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It has been shown<1> that we can neither receive objectively equal sense-stimuli, nor produce regular movements, without injecting into these a rhythmical element. A series of objectively equal sound-stimuli the ticking of a clock, for instance is heard in groups, within each of which one element is of greater intensity.
Knowledge which is mainly second-hand, other men's knowledge, tends to become merely verbal. It is no objection to information that it is clothed in words; communication necessarily takes place through words. But in the degree in which what is communicated cannot be organized into the existing experience of the learner, it becomes mere words: that is, pure sense-stimuli, lacking in meaning.
Moreover, we must admit that even in deep sleep some amount of free attention is exerted as a protection against sense-stimuli which might, perchance, make an awakening seem wiser than the continuance of sleep. Otherwise we could not explain the fact of our being always awakened by stimuli of certain quality.
As yet no systematic experiments exist by which such results can be brought into relation to the sense-stimuli which reach the laborer during his technical work. The psychophysical effect of colors and noises has not been fructified at all for industrial purposes. The mere subjective judgment of the workingman himself cannot be acknowledged as reliable in such questions.
For this reason, I think, we must suppose that certain sense-stimuli and combinations of stimuli not only produce in the sensory areas of the brain the appropriate sensations, but that their effects are prolonged, overflowing into the motor channels and there causing a total reaction of the organism, the conscious aspect of which is a vague feeling.
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