The Psychology of Singing Part 12

In Part II, Chapter II, it was seen that the outflow of the breath in tone-production is checked by the vocal cords, in accordance with Pascal's law of fluid pressures. Another law of mechanics bearing on this operation is now to be considered, viz., the law of the transformation and conservation of energy.

The application of the law of the transformation and conservation of energy to the operations of the voice is nicely ill.u.s.trated by the well-known candle-flame test of (supposedly) breath-control. To perform this test the singer is instructed to practise the exercises for breath-control while holding a lighted candle with the flame an inch or two in front of the lips. According to the idea of the breath-control advocates, the expired breath should escape so slowly, and with so little force, that no current of air can be detected at the lips, the expiration therefore does not cause the candle flame to flicker.

Describing the toneless breathing exercises to be practised with the candle flame, Browne and Behnke say, "Let it be observed that the above exercise is quite distinct from the well-known practice of _singing_ before a lighted candle, which is, comparatively speaking, an easy matter." (_Voice, Song, and Speech_.) A very striking fact is stated correctly by Browne and Behnke,--there is no current of air created at the lips during tone-production. Of the truth of this statement the reader may readily convince himself by trying this same experiment with a candle flame, or even with a lighted match. Hold a lighted match just in front of the lips and sing a powerful tone. The quality of the tone is of no consequence so long as it be powerful. Just sing, shout, yell, the louder the better. You will find that the flame is less affected under these circ.u.mstances than by the quiet expiration of ordinary breathing.

Considerable practice and close attention are required in order to hold back the breath in toneless breathing exercises. Whereas in producing any kind of powerful tone the breath normally creates no current of air at the lips.

There is no reason for considering this experiment a test of correct tone-production. It is impossible to produce a powerful tone of any kind, good, bad, or indifferent, and at the same time to create an appreciable current of air at the lips.

Needless to say, the breath-control theorists have entirely failed to grasp the significance of the candle-flame experiment. Yet we have here a demonstration of the mechanical law of tone-production.

Considered as a mechanical process, tone-production occurs when the energy exerted by the expiratory muscles, in their contraction, is converted into energy of motion of the vocal cords.[8] In other words, tone-production is an example of the transformation of energy. The law of the transformation and conservation of energy must therefore apply to this operation. This law is stated as follows: "Energy may be transformed from any of its forms to any other form. When energy is thus transformed the quant.i.ty of energy in the resulting form or forms is equal to the quant.i.ty of energy in the original form."

[Note 8: This exposition of the mechanical principle of tone-production is intended to be graphic, rather than strictly technical. For the sake of simplicity, that portion of the expiratory energy expended in friction against the throat walls, tongue, cheeks, etc., is disregarded, as well as that expended in propelling the air out of the mouth, in displacing the same quant.i.ty of external air, etc.]

The mechanical operation of tone-production comprises the following transformations of energy: First, the energy exerted in the contraction of the expiratory muscles is converted into energy of condensation or elasticity of the air in the lungs and trachea. Second, this energy of condensation of the air is converted into energy of motion of the vocal cords. In other words, the expiratory energy is transformed into energy of motion.

One objection, at first sight very serious, may be offered against this statement: the amount of strength exerted in the contractions of the breath muscles seems many times greater than is accounted for in the motion of the vocal cords. The movements of the vocal cords are so slight as to be observable only with the aid of a specially devised apparatus, the stroboscope. Can all the expiratory force expended in tone-production show such a small result? This apparent objection is found to be groundless in view of the application in this operation of Pascal's law. As this topic was fully treated in Chapter II of Part II, no further explanation is required here.

The erroneous idea of vocal mechanics involved in the doctrine of breath-control is now fully exposed. Tone can be produced only when the expired air exerts a pressure on the vocal cords. There is no necessity for any conscious or voluntary check on the expiration. The energy of the expiration is expended in setting the vocal cords in motion. No energy of condensation is left in the expired air the instant it has pa.s.sed the vocal cords. Beyond that point there is no expiratory pressure.

In one sense it is true that the expiration is "controlled" in tone-production. But this control is strictly an automatic action. The vocal cords are adjusted, by the appropriate muscular contractions, to move in response to the air pressure exerted against them. This action involves, as a necessary consequence, the holding back by the vocal cords of the out-rus.h.i.+ng air. So long as the vocal cords remain in the position for producing tone, they also control the expiration. In this sense breath-control is an inseparable feature of tone-production.

All that need be known of the mechanics of the voice is therefore perfectly plain. The vocal cords are set in motion by the pressure against them of the expired breath. This operation is in accordance with Pascal's law and the law of the conservation of energy.

But this a.n.a.lysis throws no light on the nature of the correct vocal action. It is impossible for the voice to produce a sound in any way other than that just described. In speaking or in singing, in laughing or in crying, in every sound produced by the action of the vocal cords, the mechanical principle is always the same. Nor is the bearing of this law limited to the human voice. Every singing bird, every animal whose vocal mechanism consists of lungs and larynx, ill.u.s.trates the same mechanical principle of vocal action.

Only pa.s.sing mention is required of the fallacy of the breath-band theory. The idea of any necessity of relieving the vocal cords of the expiratory pressure is purely fanciful. How any one with even a slight understanding of mechanics could imagine the checking of the breath by the inflation of the ventricles of Morgagni, is hard to conceive.

_The Psychology of Tone-Production_

This subject was treated, in some detail, in Chapter V of Part II. In that chapter however we were concerned more with a destructive criticism of the idea of mechanical tone-production than with the positive features of vocal psychology. At the risk of some repet.i.tion it is therefore advisable here to sum up the laws of psychology bearing on the vocal action.

Considered as a psychological process, tone-production in singing involves three distinct operations. First, the mental ear conceives a tone of definite pitch, quality, vowel sound, and power. Second, the vocal organs prepare to adjust themselves, by the appropriate muscular contractions, for the production of the tone mentally conceived. Third, the fiat of will is issued, causing the muscular contractions to be performed. These three operations are executed as one conscious, voluntary act. Let us inquire to what extent consciousness is concerned with each operation.

As conscious volitional impulses, the mental conception of the tone, and the fiat of will to produce the tone, are well enough understood. These two operations call for no extended consideration. We are at present concerned only with the psychological laws bearing on the muscular adjustments of the vocal organs.

Muscular contractions result from the transmission to the muscular fibers of motor nerve impulses. These nerve impulses originate in the motor nerve centers. They can never, under any circ.u.mstances, rise into consciousness. Contractions of the voluntary muscles occur either as reflex or as voluntary actions. In both cases the motor nerve impulses originate in the same nerve centers. In the case of reflex actions these lower muscular centers alone are involved; in voluntary actions the originating of the motor impulses is "controlled" by consciousness. In deciding that an action shall be performed, and in what way it is to be performed, consciousness directs that each motor center involved shall send out the appropriate discharges of nerve impulse.

Complex muscular activities require the sending out of nerve impulses from various motor centers. Such activities are usually not performed instantaneously, but require a longer or shorter time. Thus we may consider it as one action for the writer to rise from his chair, to lower the window and adjust the shade, and then to return to his seat.

In this case a large number of motor centers are successively involved; at the proper instant each center discharges its impulse. To this end the motor centers must be instructed when to come into activity.

This distribution of nerve impulse is effected by the power of coordination. In voluntary actions coordination is accompanied by conscious control.[9] But coordination is not a function of the higher cerebral centers, that is, of consciousness. How the connection is made between the higher cerebral centers and the lower motor centers is a complete mystery. All that can be said is that the ideas of movements are transmitted to the motor centers, and that these send out the appropriate motor impulses.

[Note 9: In this connection it is advisable to point out a difference between the meanings attached to the word "control" in psychology and in Vocal Science. The psychologist cla.s.ses habitual movements as either automatic or controlled. Automatic movements are purely reflex; the individual does not consciously decide whether they shall be performed or not. Psychologically considered, the _control_ of a movement is simply the conscious volitional decision whether the movement shall be performed. To adopt the language of Psychology, we should speak of _voice management_, and of _breath regulation_, instead of vocal control, breath control, etc. In the following chapters the accepted psychological usage of the word "control" will so far as possible be adopted.]

Turning now to the muscular adjustments of the vocal organs, these adjustments are seen to be independent of conscious guidance. When a tone is mentally conceived the vocal organs adjust themselves, in response to some mysterious guidance, for the production of the tone.

The vocal cords a.s.sume the appropriate degree of tension according to the pitch of the tone to be sung. Both the quality of the tone and the vowel are determined by the combined adjustments of the laryngeal muscles and of the muscles which fix the shape and size of the resonance cavities. The power of the tone is regulated by the force of the breath blast; for each degree of power some special adjustment of the vocal cords is required.

All these adjustments are executed as one concrete and individual act in response to the volitional impulse contained in the mental conception of the tone. The tone is conceived as a concrete whole. It is not normally broken up mentally into its four aspects of pitch, quality, vowel, and power. True, each one of these four characteristics of the tone may be separately considered by the singer. So also, to a certain extent, may the adjustments of the vocal organs be performed with special reference to one or the other characteristic of the tone. But in every case the muscular contractions are performed without direct conscious guidance.

Whatever be the character of the tone mentally demanded, the vocal organs instantly adjust themselves to produce the tone.

What is meant by saying that the muscular contractions are performed without conscious guidance? Does this mean that the singer is unconscious of the muscular contractions? Not at all. Muscular sense informs the singer, more or less distinctly, of the state of contraction or relaxation of the various muscles of the vocal organs. The singer always knows fairly well the condition of the various parts of the vocal mechanism. What is meant is this: The singer does not consciously direct the vocal organs to a.s.sume certain positions and conditions, and does not instruct the various muscles to contract in certain ways. The singer does not need to know, and in fact cannot know, what muscular contractions are required to produce any desired tone.

Some connection exists between the organs of hearing and the vocal mechanism. That this connection has a physical basis in the nervous structure is fairly well established. "The centers for sight and for arm movements, for instance, or those of hearing and of vocal movements, have connecting pathways between them." (_Feeling and Will_, Jas. M.

Baldwin, 1894.) The psychological law of tone-production is that the vocal organs adjust themselves, without conscious guidance, to produce the tones mentally conceived. In actual singing the practical application of this law is that the voice is guided by the ear.

This guidance of the voice by the ear is incessant. It must not be understood that the mental ear simply conceives a single tone, and that the vocal machinery then operates without further guidance. All the characteristics of the vocal tones,--pitch, quality, and power,--are constantly changing. These changes require corresponding changes in the muscular adjustments. The muscular contractions in turn are guided by the demands of the mental ear. As a psychological process, singing may therefore be a.n.a.lyzed as follows: The singer mentally sings the composition. In response to the ever varying demands of the ear the vocal organs adjust themselves to produce actually the sounds thus mentally conceived. The singer listens to these sounds and at every instant compares them to the mental conception. If the tones actually produced fail to correspond exactly to those mentally conceived, the singer instantly notes this variation and bids the vocal organs to correct it. The ear has therefore a dual function in singing. First, the mental ear directs the voice in its operations. Second, the physical ear acts as a check or corrective on the voice.

To sum up the psychology of tone-production, the singer guides or manages the voice by attentively listening to the tones of the voice.

This is the only possible means of vocal guidance. The voice and the ear together form one complete organ.

But we are still apparently as far as ever from the specific meaning of the correct vocal action. That the voice instinctively obeys the commands of the ear may be true theoretically. In actual practice we know that this does not by any means always occur. Singers are often unable to get the desired results from their voices, even when they believe themselves to rely on the sense of hearing. There must therefore be some influence which under certain conditions interferes with the operations of the vocal organs. The problem of tone-production is thus seen to be one of psychology. It narrows down to this: What can interfere with the normal action of the voice and prevent the vocal organs from instinctively responding to the demands of the ear? A satisfactory answer to this problem will be found only by a consideration of all available knowledge of the voice, both empirical and scientific. This forms the material of the final division of the present work.

Part IV

VOCAL SCIENCE AND PRACTICAL VOICE CULTURE

CHAPTER I

THE CORRECT VOCAL ACTION

Two distinct lines of approach were laid down for studying the operations of the voice. First, the manner of investigation usually accepted as scientific. This is, to study the vocal mechanism; to determine, as far as possible, the laws of its operation, in accordance with the principles of anatomy, acoustics, mechanics, and psychology.

Second, the manner of investigation generally called empirical. This begins with the observing of the tones of the voice, considered simply as sounds. From the tones we work back to the vocal organs and apply to them the information obtained by attentive listening. Both of these means of investigation have been utilized; we are now in possession of the most salient facts obtainable regarding the vocal action.

Separately considered, neither the scientific nor the empirical study of the voice is alone sufficient to inform us of the exact nature of the correct vocal action. The next step is therefore to combine the information obtained from the two sources, scientific a.n.a.lysis and empirical observation. Let us begin by summing up all the facts so far ascertained.

Tone-production in singing is a conscious and voluntary muscular operation. The vocal organs consist of a number of sets of voluntary muscles, of the bones and cartilages to which these muscles are attached, and of the nerves and nerve centers governing their actions.

The precise nature of the muscular contractions of tone-production, whether correct or incorrect, is not known. These contractions occur in accordance with established laws of acoustics and mechanics. Under normal conditions the vocal organs instinctively respond to the demands of the singer, through the guidance of the sense of hearing. The ability of the vocal organs to adjust themselves properly may be upset by some influence apparently outside the singer's voluntary control. Study of the vocal mechanism does not inform us of the meaning of the correct vocal action, nor of the difference between this action and any other mode of operation of the voice.

Empirically considered, there is a striking difference between the correct vocal action and any other manner of tone-production. A perfect vocal tone awakens in the hearer a distinct set of auditory and muscular sensations. Attentively observed, the muscular sensations of the hearer indicate that the perfect vocal tone is produced by the balanced and harmonious action of all the muscles of the singer's vocal mechanism. In listening to perfect singing the hearer feels that every muscle of the singer's vocal organs is contracted with exactly the appropriate degree of strength. Any vocal tone of unsatisfactory sound awakens in the hearer a set of muscular sensations, the direct opposite of those indicating the correct vocal action. An incorrectly produced tone imparts to the hearer a sensation of stiffness and undue muscular tension, located more or less definitely in the throat. This sensation indicates that the singer's throat is stiffened by excessive muscular contraction. Further, this feeling of throat stiffness indicates to the hearer that the singer's vocal action would become correct if the undue muscular tension were relaxed.

Combining now the results of empirical and scientific investigation of the voice, throat stiffness is seen to be the interfering influence which disturbs the instinctive connection between voice and ear. Let us now consider the meaning of throat stiffness as a feature of incorrect tone-production. First, what is muscular stiffness?

All the voluntary muscles of the body are arranged in opposed pairs, sets, or groups. A typical pair of opposed muscles are the biceps and triceps of the upper arm. Contraction of the biceps flexes the forearm at the elbow; the contrary movement, extending the forearm, results from the contraction of the triceps. This principle of opposition applies to the entire muscular system. One set of muscles raises the ribs in inspiration, another set lowers them in expiration; one group flexes the fingers and clenches the fist, an opposed set extends the fingers and opens the hand. Muscular opposition does not imply that the entire structure is made up of parallel pairs of muscles, like the biceps and triceps, located on opposite sides of the same bone. It means only that the opposed sets pull in contrary directions.

Each opposed set consists of muscles of about equal strength. Under normal conditions of relaxation the entire muscular system exerts a slight degree of contraction. To this normal state of oppositional contraction the name "muscular tonicity" is given. The present purpose does not call for a discussion of the subject of muscular tonicity. This form of contraction has no direct bearing on the performance of voluntary movements.

What effect has the voluntary contraction of all the muscles of any member, each opposed set exerting the same degree of strength? No motion of the member results, but the member is brought on tension and stiffened. This is well ill.u.s.trated in the case of the arm. Extend the arm and clench the fist; then contract all the muscles of the arm, about as the athlete does to display his muscular development. You will notice that the arm becomes stiff and tense.

This state of tension is commonly called "muscular stiffness," but the term is open to objection. It is really the joints which are stiffened, not the muscles. We are, however, so accustomed to speak of muscular stiffness, and particularly of throat stiffness, that little is to be gained by subst.i.tuting a more accurate expression.