This led to other experiments in Princeton in which suggestions were actually made to the subjects that they were to become more or less sensitive to distance and direction between the points on the skin, with the striking result that these suggestions actually took effect all over the body. This was so accurately determined that from the results of the experiments with the compasses on the skin in this case or that, pretty accurate inferences could be made as to what mental suggestions the subject was getting at the time. There was no chance for deception in the results, for the experiments were so controlled that the subject did not know until afterward of the correspondences actually reached between his states of mind and the variations in sensibility of the skin.
This slight report of the work done in one laboratory in about two sessions, involving a considerable variety of topics, may give an idea, so far as it goes, of the sort of work which experimental psychology is setting itself to do. It will be seen that there is as yet no well-knit body of results on which new experiments may proceed, and no developed set of experimental arrangements, such as other positive sciences show. The procedure is, in many important matters, still a matter of the individual worker's judgment and ability. Even for the demonstrations attempted for undergraduate students, good and cheap apparatus is still lacking. For these reasons it is premature as yet to expect that this branch of the science will cut much of a figure in education. There can be no doubt, however, that it is making many interesting contributions to our knowledge of the mind, and that when it is more adequately organized and developed in its methods and apparatus, It will become the basis of discipline of a certain kind lying between that of physical science and that of the humanities, since it will have features in common with the biological and natural sciences. Its results may be expected also to lead to better results than we now have in the theory and practice of education.
CHAPTER VII.
SUGGESTION IN CHILDREN AND ADULTS—HYPNOTISM.
In an earlier place certain illustrations of Suggestion have been given. By Suggestion we mean the fact that all sorts of hints from without disturb and modify the beliefs and actions of the individual. Certain cases from my own observation may be given which will make the matter clear.
Physiological Suggestion.—Observation of an infant for the first month or six weeks after birth leads to the conviction that his life is mainly physiological. When the actions which are purely reflex, together with certain random impulsive movements, are noted, we seem to exhaust the case.
Yet even at this remarkably early stage H. was found to be in some degree receptive to certain Suggestions conveyed by repeated stimulation under uniform conditions. In the first place, the suggestions of sleep began to tell upon her before the end of the first month. Her nurse put her to sleep by laying her face down and patting gently upon the end of her spine. This position soon became itself not only suggestive to the child of sleep, but sometimes necessary to sleep, even when she was laid across the nurse's lap in what seemed to be an uncomfortable position.
This case illustrates what may be called Physiological Suggestion. It shows the law of physiological habit as it borders on the conscious.
The same sort of phenomena appear also in adult life. Positions given to the limbs of a sleeper lead to movements ordinarily associated with these positions. The sleeper defends himself, withdraws himself from cold, etc. Children learn gradually to react upon conditions of position, lack of support, etc., of the body, with those actions necessary to keep from falling, which adults have so perfectly. All secondary automatic reactions may be classed here; the sensations coming from one action, as in walking, being suggestions to the next movement, unconsciously acted upon. The consciousness at any stage in the chain of movements, if present at all, must be similar to the baby's in the case above—a mere internal glimmering. The most we can say of such physiological suggestion is, that there is probably some consciousness, and that the ordinary reflexes seem to be abbreviated and improved.