It is not alone the slighter, more or less negligible aches or pains, nor the vague discomforts that thus disappear when our attention is occupied, but even quite severe and otherwise unbearable pain may be modified to a great extent. A toothache that is bearable, though it nags at us constantly and never lets us forget its presence while we are occupied with many other things during the evening, may become a positive torture when we get to bed. This is not only because of physical conditions modifying the pain, for there seems no doubt that the warmth induced by the preliminaries for sleep and the bed-covering have a tendency to increase congestion, but it is mainly because as we doze off we are able, less and less, to inhibit our attention, or divert it from the pain that is present, and so this is emphasized until we have to do something for it or lose hours of sleep. This lack of inhibition, which characterizes the dozing hours, represents the state of mind in which people are who have no interest in their occupations, and who have ceased to find recreation in the ordinary pleasures of life, when pain of any kind comes to them.
Cabanis, at the beginning of the nineteenth century, under the title of "The Influence of the Moral on the Physical," discusses what we would now call mental influence on the body. He says:
The great influence of what one may call the moral or mental on what may be called the physical is an incontestible fact. Examples without end confirm it every day. Every man capable of making observations finds proofs of it thousands of times in himself. Many physiologists and psychologists as well as moralists, have collected the evidence that brings out clearly this power of the intellectual operations and emotions on the different organs and the diverse functions of the living body. All of us could add new illustrations to these collections. Men who are rude and credulous talk of the effect of the imagination, and if they are not themselves its playthings and its victims, at least they know how to observe its effects In others.
As a matter of fact, the action of our organs can be in turn excited, suspended, or totally inhibited, according to the state of mind, the change of ideas, the affections and the emotions.
A vigorous, healthy man has just made a good meal. In the midst of the feeling of satisfaction which diffuses itself over all his body, his food is digested with energy and without any bother. The digestive juices perform their work steadily and without causing any annoyance. But let such a man receive some bad news; let some sudden emotion come to excite him, and especially to shock him into profound sadness, and at once his stomach and intestines cease to act upon the food which they inclose, or they at best perform their functions badly. The digestive juices, by which the food materials were gradually being dissolved, are suddenly stricken with inactivity. What might seem to be a stupor comes over the digestive tract, and while the nervous influence which determines digestion ceases entirely, that which tends to bring about the expulsion of material from the digestive tract may become more active and all the material contained in the digestive viscera may, in a short time, be expelled.
Relief in Severe Injuries.—Even extremely severe injuries, which inflict serious organic lesions that ordinarily would produce shock and collapse, quite apart from the pain induced, may at moments of excitement pass unnoticed. A soldier often does not know that he is wounded until the flow of blood calls his attention to it, or perhaps a friend points it out to him, or loss of blood causes him to faint. The prostrating effects of even fatal wounds may thus be overcome for a considerable time in the excitement of battle, or because of a supreme occupation by a surpassing sense of duty. There is the well-known story of the young corporal detailed to make a report to Napoleon at a very important crisis of one of his great battles, who made the report with such minute accuracy that it called forth a compliment from Bonaparte, for it involved a very special exercise of memory for details, yet who was actually on the verge of death when he delivered the message. As his duty was accomplished the Emperor, noticing his extreme pallor, said: "But you are wounded, my lad." The young soldier replied, as if, now that duty was done, the consciousness of his wound had just come to him, "No, Sire, I am killed," dropping dead at the Emperor's feet as he uttered the words.
In all of the great theater fires examples of this kind are recorded. A woman who barely escaped with her life from a theater fire some years ago had an ear torn off, very probably by some one grasping it in the crowd. She knew nothing of this until it was called to her attention after she got out of the theater, and then she promptly fainted from the pain and shock. Under such circumstances men walk with broken legs or limp even with dislocations, utterly unconscious that anything serious has happened to them. Men have been known to be unaware of a broken bone or even more serious conditions, ordinarily quite painful and disabling, while laboring to help others in an accident.
Suppression of Reaction.—This side of the influence of the mind on the body is so interesting that its effects have often been noted and studied. While we do not quite understand the mechanism by which it accomplishes its marvels of anesthesia and even of motility under apparently impossible conditions, there is no doubt that severe pain may utterly fail to reach the consciousness, though the nervous system is uninterruptedly carrying the messages just as it did before. The lack of attention suppresses the ordinary effect upon the personality. Evidently the messages originate and are carried to the nerve centers, but find no attention available for them, and so pass unnoticed. The study of phases of this phenomenon of suppression of reaction forms a good basis for the use of mental influence, and shows its marvelous power to overcome disturbing physical factors.
Amputation Stump Aches.—An interesting example of the influence of mind over body, when circumstances favor its exercise or emphasize it, and at the same time a striking illustration of the potency of suggestion in the cure of discomfort, is found in the stories that are so common of cases of pains in amputation stumps. Any number of weird tales are told of men who complain of feeling cramps in the toes of an amputated limb after this portion of their body had been buried. The discomfort is common enough. In the special stories, however, the limbs have been dug up, the toes straightened out—according to the story, they were always found cramped in some way—and then the patient is at once restored to ease. In the good old times they probably believed in some direct connection between the straightening out of the toes of the amputated member and subsequent relief of pain. For us it is but an example of the power of suggestion. It is not the sort of suggestion that one likes to think of employing, though it has a certain dramatic quality which adds efficiency to suggestion.
The Mind and Motility.—We have spoken thus far almost exclusively of painful conditions as relieved by suggestion or mental influence, but disturbance of motor function may also be favorably affected. There are any number of cases on record in which patients who had been utterly unable to walk were restored to motility by a shock. Many such patients have, in the midst of the excitement of a fire, or the scare caused by the presence of a burglar, got up and walked quite as well as ever, though sometimes they have been for years previously confined to bed. The San Francisco earthquake is said to have exerted such an effect on a number of patients, and, while such unusual disturbances cannot often be provided for the cure of these ailments, there can be no doubt at all of the power of a shock to the mind to overcome functional incapacity that has resisted every possible form of treatment.
Ailments of this kind, which involve inability of the will to control, or rather to initiate, movements of the body, receive their best explanation on the neuron or neuroglia theory. (See the chapter on the Mechanism of Suggestion.) The central neurons become either quite separated from certain of the peripheral neurons, or at least the connections are not made with that nice adjustment necessary for the proper passage of nerve impulses. The shock communicated to the nervous system by fright is sufficient, however, to restore these connections, and consequently to enable the patient once more to exercise motor functions that have been in abeyance for some time.
Astasia-abasia. —Any one who has had to deal with the cases for which the French have invented the rather impressive