Insanity: Its Causes and Prevention

by Henry Putnam Stearns

Periods of mental lethargy come over many persons at times, so that they care neither to talk nor engage in any of their usual intellectual or physical pursuits; and such stimuli as are usually sufficient to rouse the brain into action appear to have very little effect. They feel and say that there is a state of only partial brain-activity. At other times the brain acts with the greatest freedom; occurrences which took place long years before, and which, perhaps, have not been thought of since, come back with all the freshness of yesterday. Thoughts come rapidly. Keen flashes of wit, bright scintillations of thought, forms of expression of unusual felicity, pour forth spontaneously, while the mind apprehends and retains many kinds of knowledge with the greatest readiness. Similar variations take place in reference to courage and its opposite, timidity; truthfulness and suspicion; and, in fact, the whole range of mental endowments.

Now all this grand play of diverse emotions and conditions in the psychical functions takes place in a state of health; still, there can be no doubt that it comes from an unstable condition of the nervous elements of the brain, or from changes produced in some manner in these varied and delicate structures. It may be from varying states which are constantly occurring in the blood, in the processes of reception and elimination; or from those delicate chemical operations which must be forever going on in the nerve elements of the brain hemispheres, affecting their recipient and sensitive capacities; or it may be from other unknown causes: and these changes occur much more readily and frequently in some persons than in others.

Bearing in mind, now, these conditions of the physical and mental systems, the tendencies to which are inherited, and more or less changeful in character, we may proceed a step farther.

This unstable condition, both physical and mental, may exist not only as an inherited condition, but it may be produced, or become greatly increased by causes external to the system, which are brought into contact so as to influence it.

A few illustrations may serve to make this more clear:

1. When a person who has not been accustomed to use the muscles of the arm in active and vigorous exercise, lifts, or makes a strong effort to lift, a heavy weight, if the effort is continued any considerable length of time, two conditions result therefrom:

First, a state of tremulousness, or spasm of the arm, hand, and especially of the fingers. The largest effort the individual can make toward controlling this irregularity of movement, is insufficient, and these parts remain in a condition of more or less spasmodic action, until the nervous energy is restored.

Second, there results a sensation of pain, more or less severe, according to the time the exertion has continued. This would indicate positive injury, to some extent, in the nerve filaments of the muscles which have been so unusually exercised. The degree of effect will be dependent upon the condition of the nerves of the hand and arm at the time the effort is made, and upon the amount of force expended.

If the effort is repeated soon, there will result a similar condition, and ultimately the nerve would cease to respond to the call for action in any degree,—the arm would be paralyzed.

2. All are more or less familiar with that condition which is usually termed the writer’s cramp. Sometimes persons of a peculiar nervous organization, who have been accustomed to spend many hours a day in the mechanical process of writing, experience such a loss of nervous energy that the arm fails to respond to the will power. There results spasmodic and irregular movements in the arm, and more especially in the fingers, indicating that some morbid condition of the median nerve has been produced. If the case is neglected, and the exciting causes continue in operation, after awhile the nerve will become less and less responsive to the call of the will, and the arm may become seriously affected, after a longer or shorter period of more or less pain. In this case, as in the former one, there may exist all degrees of impairment of nerve function, from that of slight unsteadiness or instability, up to entire failure.