Mental Exhaustion.—Many disturbances of mental energy are acquired. These may be either functional or organic. For the organic variety we cannot do much, since it is dependent on changes in organs that are permanent. We can, however, usually predispose the patient's mind to the recognition of the fact that he should no longer try to devote himself to occupations that constitute a special drain on his nervous energy. The man, for instance, who is already suffering from arterio-sclerosis must be warned that worry and work will surely hasten the process and that his nervous symptoms cannot be cured, but must be palliated. He must be advised to lessen his mental strain and to take up something which, while occupying his mind, does not make insistent calls on his vitality. In this matter it must be remembered that when a man over fifty develops nervous symptoms, as a rule there is no question of functional trouble but of organic change and usually heart or arteries or kidneys are at fault.
In recent years we have come to realize that typhoid fever often makes serious inroads upon a patient's vitality which can only be retrieved by care, not alone for some months but, if possible, even for some years, not to put an overstrain on the vital energy. Certain other diseases produce an even more lasting effect. A sufferer from well-developed tuberculosis will probably never be able to go back to the strenuous city life. If he attempts to do so, not only is there danger of a recurrence of his tuberculosis, but there may even be a development of neurotic symptoms. Syphilis is another disease that leaves patients in a condition in which it is dangerous for them to assume the serious responsibilities of an exacting occupation and especially anything that involves excitement and worry. Syphilitic patients should be warned of the danger of pursuing vocations that make such demands upon them. It is the actor, the broker, the speculator, and the strenuous business man generally, who is likely to suffer from parasyphilitic conditions, tabes, paresis and the like, much more than those who follow occupations that make less demands on them.
Functional Mental Incapacity.—In a large number of cases the incapacity to do things because of lack of mental energy is due to functional disturbances of the nervous system. These are the most important for the psycho-therapeutist because much can be accomplished for them. Nearly always the patient can be benefited by advice and suggestion, and very often some [{600}] unfavorable factor at work, using up his mental energy to no purpose, will be discovered. In order to do good, however, careful study of the individual patient is the most important element. The most frequent functional disturbance of the nervous system, leading to exhaustion of mental energy, is over-attention to one's self and to one's occupations. Men can do many complicated things quite naturally and easily, but when they carefully watch themselves doing them, accomplishment is not so ready and the task is double. They tire much easier, for, as a rule, what they are doing could be accomplished automatically and they are using up energy attending to it. This is probably one of the commonest causes for the rather frequent development of that state called nervous exhaustion in our time. People watch themselves too closely and by so doing they not only use up energy unnecessarily in the surveillance, but also they hamper their powers to do things and so consume additional energy in overcoming this inhibition.
Morbidly introspective people watch almost ceaselessly everything they do. They not only watch themselves work and worry about it, but they watch themselves play and grow solicitous that it will do them good; they watch themselves divert themselves to see if it is giving them real recreation and so spoil the diversion; they watch themselves eat and disturb their appetite, and watch themselves digest and hamper digestion; they even try at least to watch themselves sleep and so interfere with sleep. Many of the cases of insomnia are really due to this over-attention. They fear they will not sleep, they worry about it, they keep themselves awake hoping that they will sleep, and in the more serious cases even during sleep itself they are so solicitous that their dreams become very vivid and a form of unconscious cerebration goes on with surveillance of themselves. They do not rest even in sleep. They wake feeling not rested, they get up with a consciousness that they are beginning a long day without being properly refreshed and they exhaust enough energy to complete a good part of the day's work in wondering whether they will be able to go on with their occupation for the day, whatever it may be.
Inhibitory Surveillance.—People become afraid that they cannot or that they may not do things well and set a guard over themselves. This is illustrated very well in the doubts about accomplishment because of which they keep going back to see what they have done and how it was done, though usually it was accomplished quite well without any conscious attention. Dreads form another phase of this attitude of mind. For those who are affected with them they make a thing hard to do before it is begun, and harder to accomplish after it has been entered upon because of the suggestion that it may lead to some serious results, or they even inhibit their activities to a marked extent by their solicitude with regard to them. They worry about things before the event and thus consume energy uselessly. Worry has been defined as anxious solicitude about what we have to do next week at the same time that we occupy ourselves with what we are doing now and have to do in the next hour or two. The solicitude about next week is quite useless, as a rule, until the time comes, and it merely disturbs what we are doing now, making it harder to do and making errors in it almost inevitable, and so preparing ourselves for discouragement because of mistakes that have been made and still further adding to the difficulty of accomplishment.
Inhibition of Automatism.—These introspective people disturb themselves by over-attention to things that need no attention, that are accomplished automatically, and that are not done nearly so well if they are attended to. Not only is it true that it is harder to do work that ought to be accomplished automatically if much attention is given to it, but also nature resents the surveillance. Not only the brain does not work so well if watched to see whether perhaps it is working too much, or whether there are too many feelings in our head while we are doing things, but even the stomach resents being watched and does not do its work as well. The same thing is probably true for every one of our organic functions. In the chapters on the heart we call attention to the fact that surveillance makes a perfectly healthy though nervous heart miss beats. There is a dual waste of nervous energy then. We are employing our attention watching things done that need not be watched, and by that fact we are inhibiting natural processes and requiring that more energy shall be put into them for their accomplishment, and even then accomplishing them with discouraging imperfection.
Mental Short-Circuit.—The reflex mental process that particularly affects many individuals in our time and makes it hard for them to do their work, has been well described under the figure of a short-circuit in an electrical dynamo. The short-circuit diverts the current so that instead of acting outside the dynamo and performing useful work, it is discharged within the machine, brings about deterioration of its elements and soon leads to a reduction in the amount of electrical energy that that particular dynamo can develop.
Association Fibers Diversion.—Prof. Michael Foster in the Wilde Lecture for 1898, "The Physical Basis of Psychical Events," [Footnote 44] has many valuable suggestions with regard to the mechanism of mental operations on the neuron theory. He has particularly dwelt on the function of the association fibers in connection with mental operations, or with the raising of sensation to the plane of mentality. A portion of the brain that is originating impulses, instead of sending them down to the periphery, through the projection fibers, to lead to the accomplishment of external work, may have its messages diverted through the association fibers to other portions of the brain and thus do harm rather than good.
[Footnote 44: Proceedings of Manchester Literary and Philosophical Association, 1898.]