Chapter 24

THE CAUSES OF THROAT STIFFNESS AND OF INCORRECT VOCAL ACTION

Involuntary contractions of the voluntary muscles can occur only as reflex actions. If the muscles of the vocal organs are subject to involuntary contractions, the causes of these contractions must be sought through an investigation of the subject of reflex actions.

Reflex actions are of several kinds; of these the simplest type, and the one most easily studied, is the muscular contraction due to the excitation of the sensory nerve endings located in the skin. Thus when the sole of the foot of a sleeping person is tickled, the leg is at first drawn up and then violently kicked out. An exhaustive discussion of the physiological and psychological features of reflex action is not called for here; a sufficient understanding of the subject may safely be assumed to be possessed by the reader.

Involuntary muscular contractions often occur as reflex actions without any direct or tactual irritation of the sensory nerve endings. Several examples of this form of reflex action are now to be considered. These actions will be seen to be matters of such common experience as to call for no special proof. They are the following:

(_a_) Reflex actions performed under the influence of sensory impressions other than those of touch or muscular sense.

(_b_) Involuntary muscular contractions due to nervousness.

(_c_) Contractions of the muscles of certain members, caused by the turning of the attention specially to the members.

(_d_) Involuntary contractions of muscles, accompanying the exertion of other associated and antagonist muscles, and due to the radiation of nerve impulse.

(_a_) _Reflex Actions due to Sensory Impressions other than those of Touch or Muscular Sense_

A wide range of movements is included under this heading. Of these it is necessary to mention only a few, such as the sudden start on the hearing of an unexpected noise, the instinctive movement of dodging to escape an approaching missile, and the raising of the arm to ward off an expected blow.

Actions of a somewhat similar character normally occur in which it is not easy to point to the excitation of any sense or senses. These include the instinctive cowering attitude of fear, the play of facial expression caused by sentiment and emotion, etc.

(_b_) _Involuntary Actions due to Nervousness_

A condition of marked nervousness generally causes the involuntary contraction of muscles. Who does not recall his earliest attempts at "speaking a piece" in school? The trembling of the lips, the twitching of the arms and hands, and the vain attempts to govern the bodily movements, are an experience painful even in the recollection.

Movements and contractions due to nervousness are entirely purposeless; they even defy the most earnest efforts at inhibition. A marked feature of this type of involuntary action is the contraction of antagonist groups of muscles, productive of muscular stiffness of the members.

An extreme example of this form of nervousness is offered by the unfortunate sufferer from stage fright. In this condition the entire body often stiffens, and purposeful movement of any kind becomes for a time impossible.

(_c_) _Contractions caused by Special Attention to Certain Members_

Suppose a small boy of sensitive nature to enter a room suddenly, and to be at once chided for his awkwardness. His body will probably stiffen, and his awkwardness become more pronounced. Now call his attention to his hands and tell him he is holding them badly. His arms and hands will immediately become painfully stiff. Speak of his feet and his legs come on tension. Whatever member his attention is turned to, the muscles of that part contract involuntarily.

Photographers sometimes have to contend with this form of involuntary action on the part of their sitters. When the hands are to be posed the arms stiffen; so also do the legs, the shoulders, and the neck, each when its turn comes to receive attention.

Under normal conditions this form of awkwardness is easily overcome. Sitting for a photograph soon becomes a simple matter. The boy outgrows the awkward stage and gradually acquires a natural and easy bearing. Muscular stiffening due to attention to special members is usually the result of an uncomfortable feeling of being out of one's element, and ill at ease in one's surroundings. So soon as this feeling wears off the tendency to this form of stiffness disappears.

(_d_) _Contractions of Muscles due to the Radiation of Nerve Impulse_

A voluntary exertion of some of the muscles of a member sometimes causes the involuntary contraction of all the other muscles of the part. As will readily be seen, the exercise then takes place under conditions of muscular stiffness. This is commonly a feature of the unskilful and unaccustomed performance of muscular activities. A few examples will serve to illustrate this type of involuntary contraction better than a lengthy discussion of the physio-psychological principles involved.

When a novice takes his first lesson in riding a bicycle he clutches the handle bars in a vise-like grip. His knees are so stiff as to bend only with a great exertion of strength. To steer the wheel the learner must put forth his most powerful muscular efforts. A half-hour lesson in bicycle riding often tires the beginner more than an afternoon's ride does the experienced cyclist.

This condition of muscular stiffness is due to the contraction of antagonist groups of muscles, involving practically the entire body. In one sense the excessive muscular contractions are involuntary; yet it would not be easy to define where the voluntary element of the contractions leaves off.

A similar excessive expenditure of strength may be seen in the attempt of an illiterate laborer to sign his name. He grips the pen as though it were a crowbar, and puts forth enough strength to handle a twenty-pound weight. Learning to dance, or to skate, or to row a boat, is usually accompanied in the beginning by this form of muscular stiffness.

As skill is acquired by practice in the performance of complex activities, the undue muscular tension of the initial stage is gradually relaxed.

There is another way in which the radiation of nerve impulse may be caused, entirely distinct from the lack of use or skill. Muscular stiffness may be induced in the case of activities so thoroughly habitual as to be normally performed automatically. The cause of muscular stiffness now to be considered is the attempt to perform complex activities mechanically, that is, by consciously directing the individual component movements and muscular contractions involved in the actions. Involuntary contractions of associated and antagonist muscles take place under these conditions, in addition to the voluntary exercise of the muscles normally exerted in the movements.

This fact may be illustrated by attempting to write a few lines, and forming every stroke of each letter by a distinct exercise of the will. If you keep up this attempt for ten minutes you will find that you press upon the paper with many times your accustomed weight. The hand stiffens in consequence of the close attention paid to its movements. This stiffness will extend to the arm, and even to the shoulder, if the exercise be continued long enough and with sufficient intensity of attention to the hand.

Another good illustration of this form of muscular stiffening may be found by walking upstairs, and paying the same kind of attention to the muscular actions. Try to ascend a single flight of stairs, performing each elementary movement by a distinct volitional impulse. Pause on the first step to secure perfect balance on one foot; raise the other foot, bending the leg at the knee, then place this foot carefully on the next higher step. Now gradually shift the weight of the body from the lower to the higher foot; as the body inclines forward, exert the muscles of the back and sides to preserve your balance; then contract the leg muscles so as to raise the body to the higher step, with the weight supported on that foot. Repeat this operation for each step. To mount one flight of stairs in this way will tire you more than ascending a half dozen flights in the ordinary automatic way.

All four of the types of involuntary muscular contraction just described may be combined in a single instance. An inexperienced violin soloist, such as a student playing at a conservatory recital, often exemplifies this. Nervousness and awkwardness cause him to tremble; the scratchy sound of his tones makes him twitch and start; meanwhile, the close attention paid to his fingering and bowing stiffens his arms and completes his difficulty.

The vocal organs are peculiarly subject to the forms of involuntary muscular contraction under consideration. Each of the causes of muscular tension may exert its special influence on the voice. Let us go over the ground once more, this time with special reference to the actions of the throat muscles.

_(a) Reflex Actions of the Muscles of the Vocal Organs, Independent of Direct Sensory Excitation_

Involuntary actions of the vocal organs normally occur in response to stimuli furnished by the emotions and feelings. Every one is familiar with the shout of triumph, the sigh of relief, and the ejaculation of surprise. Some emotions cause a convulsive stiffening of the muscles of the vocal organs so complete as to render tone-production for a time absolutely impossible. "Speechless with terror," "breathless with apprehension," are expressions which accurately describe psychological processes. A crowd of people watching a difficult rescue of a drowning man is silent so long as the uncertainty lasts. A shout instantly goes up when the rescue is seen to be safely effected. Both the silence of the nervous strain and the shout of relief are normal involuntary responses to the emotional states.

_(b) The Influence of Nervousness on the Vocal Action_

Nervous conditions exert a striking influence on the operations of the voice. Even when our self-control under trying conditions is complete in all other respects we are often unable to prevent our voices betraying our nervous state. Stage fright, an extreme form of nervousness, sometimes deprives the sufferer entirely of the power of speech. This temporary loss of vocal command is not due to an inability to innervate the muscles of the vocal organs; on the contrary, it is caused by extreme muscular stiffness due to the violent, though involuntary, contraction of all the muscles of the vocal organs.

Under normal conditions, entirely aside from nervousness, the voice instinctively reflects every phase of sentiment and emotion. Love and hate, sorrow and joy, anger, fear, and rage, each is clearly expressed by the quality of the tones, independent of the meaning of the spoken words. All these fine shades of tone quality result from muscular adjustments of the vocal mechanism. In some mysterious manner the outflow of motor impulses to the throat muscles is governed by the nervous and emotional states.

This form of muscular contraction is in one sense not involuntary. As the voice is voluntarily used, all the muscular contractions involved are voluntary. Yet the minute contractions producing tone qualities expressive of emotion are distinctly involuntary. More than this, these contractions cannot usually be inhibited. An angry man cannot make his voice sound other than angry. Our voices often betray our feelings in spite of the most earnest efforts at concealment.

While the voice always normally and involuntarily adopts the tone quality indicative of the emotional state, this action of the vocal organs may be voluntarily and purposely performed. A perfect command of these fine shades of tone quality renders the voice a very potent instrument of expression. For the purposes of dramatic singing this form of vocal expression might be of great value. It is to be regretted that dramatic singers of this day pay so little attention to purely tonal expressiveness. This is probably due in great measure to the prevalence of throat stiffness, which robs the voice of much of its expressive power.

_(c) Contractions of the Throat Muscles, caused by Attention to the Throat_

When a physician attempts to examine a child's throat, the tendency of the throat muscles to this form of involuntary contractions is apt to be evidenced. The jaw stiffens and the tongue rises; for a time the rebellious little throat refuses to remain quiet and relaxed.

People usually have some such difficulty the first time they submit to examination with the laryngoscope. This is very apt to occur, even in the case of experienced singers. Needless to say, this form of muscular contraction is entirely involuntary; it even defies the most earnest attempts at prevention. Comparatively little experience is required for normal people to overcome this tendency. The throat usually becomes tractable after one or two trials with the laryngoscope.

Vocalists are well aware of the proneness of one part of the vocal mechanism, the tongue, to stiffen in consequence of direct attention being paid to this member. In this connection Frangçon-Davies remarks: "When the writer in early student days concentrated his attention upon his tongue he found that this member became very stiff and unruly indeed." (_The Singing of the Future_, London, 1906.) Leo Kofler speaks of the same tendency: "Tell a pupil to let his tongue lie flat in his mouth; he draws it back till it dams up his throat." (_Werner's Magazine_, Oct., 1899.)

_(d) Throat Stiffness due to the Radiation of Nerve Impulse_

Two types of muscular tension due to the radiation of motor impulses were noted; first, the stiffness incident to the early stages of practice in complex activities; second, the stiffness caused by the attempt to perform complex activities in a mechanical manner by paying attention to the individual component movements and contractions. To both these types of muscular stiffness the voice is especially subject.

It is not easy to find a perfect illustration of throat stiffness incident to the early stages of instruction in singing. For this the chief reason is that the later form of stiffness, due to the attempt directly to manage the vocal organs, is much more pronounced than the temporary early tension. As good an example as possible would be the following: Let some one possessed of a fine natural untrained voice sing a steady tone and then attempt to trill on the same note. The attempted trill will invariably indicate a much higher degree of stiffness than the single tone.

Several investigators of the voice have noticed the tendency of the throat to stiffen when the singer tries to manage the voice by paying direct attention to the mechanical action. Clara Kathleen Rogers points this out clearly in the following passage: "There exists a possible and a dangerous obstacle to the performance of the natural mission of the voice. That obstacle is what? It is a superfluous and misdirected mental activity which is fruitful of a corresponding obstruction on the part of the body. In the body this obstruction takes the form of superfluous or unnatural tension." (_The Philosophy of Singing_, N. Y., 1893.) Prof. Scripture describes in scientific language the results of any attempt directly to manage the vocal organs. Speaking of the use of the voice under unfavorable conditions, he says: "The attempt is instinctively made by the speaker or singer to correct such a fault by voluntary innervation of the muscles; this cannot succeed perfectly because an increase of innervation brings about contractions of associated and antagonist muscles with the result of changed conditions and changed sounds. Such extra muscular effort is, moreover, very fatiguing." (_The Elements of Experimental Phonetics_, 1902.)

For the purposes of scientific voice culture this is one of the most important facts which have been determined. The attempt to manage the voice, by paying attention to the mechanical operations of the vocal organs, causes an involuntary contraction of all the throat muscles, and so interferes with the normal instinctive vocal action. Even the mere thinking of the throat in singing, and especially in practising, is enough to induce throat stiffness.