This behavioral treatment is prescribed primarily for patients with nonorganic voice disorders. A patient with a nonorganic voice disorder has been diagnosed with aberrant voice production due to the abnormal use of a normal mechanism, often due to stress or some sort of secondary gain. She or he may have been ‘stuck’ with the abnormal voice for months to years, or may lurch between normal and abnormal voice production on an apparently involuntary basis. To help patients first “find” their normal voices, the clinician guides the patient through a variety of vocal elicitations such as: a yell, glissando, siren, or vocal fry. All of this may be with or without clinician digital manipulation of the laryngeal framework. After preliminarily ‘settling in’ the patient’s reestablished normal voice, the clinician quickly asks the patient to alternate between the re-established normal voice and the old abnormal voice. First, the patient alternates upon clinician cue, again optionally with or without digital manipulation, and then the patient demonstrates the ability to switch between the two kinds of voice production at the sentence level, and then every few words, and then word-by-word. The positive and negative practice demonstrates mastery / control over the abnormal/ nonorganic voice production. If possible, this process should occur with patient, clinician, and family/ friends in attendance. Other doctors, speech pathologists, pulmonologists, and allergists who may have previously attempted to help the patient using medical rather than behavioral treatments should also be made aware of the nature of the patient’s diagnosis, the purely behavioral approach to it, and the idea that behavioral intervention to resolve this problem completely should not normally exceed three visits to a speech pathologist, to avoid his or her becoming a co-dependent or source of secondary gain.
The term ‘vocal cord chatter’ describes the audible phenomenon one hears when the voice starts and stops in rapid alternation because the mucosa is at the edge of its ability to vibrate at a given pitch, loudness, and subglottal air pressure. So, it “catches” the airstream and vibrates for a fraction of a second, then stops, then restarts, then stops, etc. The best understanding is gained through audio and video examples.
Segmental vibration compared to full-length: Series of 4 photos
Translucent polypoid swellings (1 of 4)
A younger man with chronic hoarseness due to large translucent polypoid swellings, not seen well at closed phase of full-length vibration at E3 (165 Hz).
Open phase, E3 (2 of 4)
Open phase of vibration at the same pitch showing that the full length of both cords swings laterally. Now the large polyp left vocal cord (right of photo) is easily seen.
Closed phase, E4 (3 of 4)
At E4 (330 Hz), vibration is damped (not allowed) except for the short anterior segment indicated by arrows.
Open phase, E4 (4 of 4)
At the same pitch, but open phase of vibration of that same short segment.
Whistle register or tin-whistle segmental vibration?: Series of 4 photos
Closed phase (1 of 4)
Closed phase of vibration at C4 (~ 262Hz) in a woman who is chronically hoarse and is a "vocal overdoer". Note the early contact at the bilateral swellings (right greater than left), and the MTD posturing (separation of vocal process "grey" zone posteriorly).
Open phase (2 of 4)
Open phase of vibration, shows that the entire length of the vocal cord margin participates in vibration at this pitch.
Segmental vibration (3 of 4)
Segmental vibration at F5 involves only the short anterior segment (brackets). The vocal cord swellings do not vibrate, nor does the posterior vocal cord. This is the closed phase of vibration.
Whistle register (4 of 4)
Open phase of that tiny anterior segment. This imparts a truly tiny "tin whistle" quality that cannot be maximized to a volume above beyond pianississimo. In some cases, singers who have not seen their vocal cords at this kind of high magnification under strobe light believe this to be a normal "whistle register".
Search not only for nodules, but also for segmental vibration and look at the posterior commissure for MTD: Series of 4 photos
Open phase (1 of 4)
In a young pop-style singer, the open phase of vibration under strobe light at C#5 (554 Hz). This magnified view is best to see the large fusiform nodules.
Closed phase (2 of 4)
Closed phase of vibration at the same pitch shows touch closure—that is, that the nodules barely come into contact.
Segmental vibration (3 of 4)
Even when patients are grossly impaired in the upper voice as is the case here, the clinician always requests an attempt to produce voice above G5 (784 Hz), in order to detect segmental vibration. Here, the pitch suddenly breaks to a tiny, crystal-clear D6 (1175 Hz) Only the anterior segment (arrows) vibrates.
Posterior commissure (4 of 4)
A more panoramic view that intentionally includes the posterior commissure to show that the vocal processes, covered by the more ‘grey’ mucosa (arrows), do not come into contact. This failure to close posteriorly is a primary visual finding of muscular tension dysphonia posturing abnormality.
Sulcus and segmental vibration: Series of 4 photos
Glottic sulci (1 of 4)
Closed phase of vibration, strobe light, at G3 (196 Hz) in a young high school teacher/ coach who is also extremely extroverted. Faint dotted lines guide the eye to see the lateral lip of her glottic sulci.
Open phase (2 of 4)
Open phase of vibration at the same pitch, showing full-length oscillation.
Segmental vibration (4 of 4)
Open phase of vibration also at E-flat 5, Only the tiny segment opens significantly. As expected the patient’s voice has the typical segmental “tin whistle” quality.
Closed phase (3 of 4)
Closed phase of vibration at E-flat 5 (622 Hz). Arrows indicate closure of the short oscillating segment.
Open cyst and sulcus; normal and segmental vibration: Series of 6 photos
Margin swelling (1 of 6)
Breathing position of the vocal cords of a very hoarse actor. Note the margin swelling of both sides. The white material on the left vocal cord (right of photo) is keratin debris emerging from an open cyst. Find the sulcus of the right vocal cord (left of photo) which is more easily seen in the next photo.
Narrow band light (2 of 6)
Further magnified and under narrow band light. The right sulcus is within the dotted outline. Compare now with photo 1.
Open phase, strobe light (3 of 6)
Under strobe light, open phase of vibration at A3 (220 Hz). The full length of the cords participate in vibration.
Closed phase, same pitch (4 of 6)
At the same pitch, the closed phase again includes the full length of the cords.
Segmental vibration (5 of 6)
At the much higher pitch of C5 (523 Hz) a “tin whistle” quality is heard and only the anterior segment (at arrows) is opening for vibration. The posterior opening is static and not oscillating, as seen in the next photo.
Closed phase (6 of 6)
The closed phase of vibration involves only the tiny anterior segment of the vocal cords, at the arrows. The posterior segment is not vibrating and is unchanged.
Tiny vibrating segment gives tiny tin whistle voice: Series of 6 photos
Prephonatory instant (1 of 6)
This young woman has been hoarse for many years. This preparatory posture shows marked separation of the cords posteriorly, suggesting MTD as well.
Phonation (2 of 6)
Now producing voice, with vibratory blur of the entire length of the cords on both sides.
Gaps due to nodules (3 of 6)
Under strobe light at a lower pitch of A4 (440 Hz), closed phase of vibration. Large gaps anterior and posterior to the polypoid nodule(s) explain breathy quality and short phonation time.
Open phase (4 of 6)
Open phase of vibration also at A4 (440 Hz) shows that the full length of the vocal cords are vibrating. Compare with the following two photos.
"Tin whistle" sound (5 of 6)
Now at A5 (880 Hz), the patient can only make an extremely tiny (tin whistle) quality. The only segment vibrating is within the circle (here, closed phase). The posterior segment does not vibrate.
"Tin whistle" at open vibration (6 of 6)
Still at A5 (880 Hz), the open phase of vibration, again of *only* the tiny anterior segment.
This characteristic might manifest most clearly during sustained phonation as a glitch, catch, wavering, tremor, in-and-out vocal fry, or other such finding. In each case, the patient would be unable, partially able, or only intermittently able to produce a steady and predictable voice.
A tremor that sometimes accompanies laryngeal dystonia and its effects on voice function (spasmodic dysphonia), breathing function (respiratory dystonia), or both. This dystonic tremor is heard as a “wavering” in the voice (if the person has spasmodic dysphonia) or in the sound of inhaled or exhaled air (if the person has respiratory dystonia), or it can be detected in both the voice and the sound of inhaled or exhaled air (if the person has both spasmodic dysphonia and respiratory dystonia). A patient who exhibits this kind of tremor in tandem with spasmodic dysphonia, for example, may be described by the examining clinician as having “spasmodic dysphonia with a small/moderate/large/overwhelming tremor component.” Dystonic tremor can also appear in other parts of the body (e.g., as head or limb movements) when a person’s dystonia affects those parts, but our focus here is on dystonia of the larynx.
Voice-affecting dystonic tremor might sometimes be mistaken for the tremor induced by a different neurological disorder, essential voice tremor. If one knows what to listen for, however, it is usually possible to distinguish dystonic tremor from the tremor induced by essential voice tremor. Most obviously, dystonic tremor is almost always accompanied by other manifestations of dystonia, such as phonatory arrests, dropouts to a whisper, or squeezedowns. Dystonic tremor may worsen under specific circumstances—with stress, fatigue, or during telephone use, for example. Dystonic tremor is often (though not always) more pronounced in the patient’s chest register voice than falsetto register voice—sometimes dramatically so—and this difference might be heard when the patient is asked to sustain a single sung note as steadily as possible. Finally, dystonic tremor’s amplitude can vary from cycle to cycle; to use singers’ parlance, it is as though a couple of cycles of “wild” vibrato are followed by a few cycles of merely wide vibrato, followed by a second or two of much more stable voice. In the occasional case, however, a patient’s tremor is so overwhelming and these distinctive qualities of dystonic tremor so subtle that the clinician proceeds initially with a working, rather than settled, diagnosis.
Vocal tremor: A regular, wavering quality of voice, analogous to a singer’s vibrato but occurring, to an individual’s distress, during speaking, not just during singing. May occur as a sole abnormality in essential voice tremor, or in combination with spasmodic dysphonia.
Teaching demonstration (mimicked):
Patient example dystonic tremor: Note accompanying squeezedowns and difference in two registers
The name given to a quality of sound produced at low pitch (generally below 90 Hz, or around E2 or F2 in musical notation). Vocal fry is produced in what some call pulse register, as compared with chest and falsetto registers. Once defined with the help of audible examples, most individuals can readily identify this quality of voice. It may be heard in poorly produced voices; in other cases, it is used intentionally as a training technique, particularly for air-wasting dysphonia that has a functional cause.