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It is safer to say that it is irritable, that is, it reacts to stimuli too feeble to be regarded as the cause of its reaction. It engulfs microscopic plants, and digests them in the internal protoplasm by the aid of an acid secretion. It breathes oxygen, and excretes carbonic acid and urea, through its whole body surface.
For you can associate an emotion, say fear, first with something immediately dangerous, then with the idea of that thing, then with something similar to that idea, and so on and on. The whole structure of human culture is in one respect an elaboration of the stimuli and responses of which the original emotional capacities remain a fairly fixed center.
The publicity of a city, the universal surveillance, the studied decorum of a population conscious that it is continually exposed to the gaze of strangers, combine to spread a veil over the esoteric side of life, which, even when at last it fails to conceal from the young the urban stimuli of that life, effectually conceals, for the most part, the gratifications of those stimuli.
Acting as stimuli, the impulses seem able to produce two distinct effects: first, to throw resting organs into action and to increase the activity of organs already at work; and second, to diminish the rate, or check entirely, the activity of organs. Impulses producing the first effect are called excitant impulses; those producing the second effect, inhibitory impulses.
This capacity shows itself in two important ways in the interest in sensory stimuli, usually discussed under the head of curiosity, and in the delight in "being a cause" or mental control. The interest in tastes, sounds, sights, touches, etc., merely for their own sake, is very evident in a baby. He spends most of his waking time in just that enjoyment.
The sleeping state or the psychical change to sleep, whatsoever it be, is brought about by the child being sent to sleep or compelled thereto by fatigue, only assisted by the removal of all stimuli which might open other objects to the psychical apparatus.
In the following groups of illusion we may look away from nervous processes and organic disturbances, regarding the effect of any external stimulus as characteristic, that is, as clearly marked off from the effects of other stimuli, and as constant for the same stimulus.
Above all the intensity of mental stimuli is always relative. The psychologist knows the experiments which determine that we perceive the difference of impressions as alike when the stimuli are proportional. If I have a ten-pound weight in one hand, I may find that I must have one pound more in the other hand to discriminate the difference.
It is, perhaps, partly the fault of the one-sidedness of strict Darwinism that this consideration has been so slowly brought into prominence and subjected to investigation and experiment. It is bound up with the capacity that all forms of life have of reacting spontaneously to “stimuli” and, to a certain extent, of helping themselves if the conditions of existence be unfavourable.
For if man does not live by material bread alone, neither does he live solely by intellectual bread. The stimuli of the environment are not only the objects, but also the persons, with whom our relations are not merely sensory. In fact, we are not content to admire in them that beauty to which the Greeks were so sensitive, or to listen to their speech or their song.
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