Klinische und experimentelle studien über Stimmlippenschwingungen

Dunker, E.; Schlosshauer, Bürkhard

doi:10.1007/bf02103025

Cited by 20 publications

(7 citation statements)

References 6 publications

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“…Smv-r. change in register. That an increase in tension of the vocal cords is more essential for an increase in pitch than a rise in air pressure is evidenced from the unchanged pitch of the phonation produced by patients in which an artificial air current of different intensity was applied through a tracheal cannula [Dunker and Schlosshauer, 1958]. The increase in electrical activity of the vocal muscle with increasing pitch is consistent with the myoelastic theory, according to which pitch depends on the tension of the vocal cord.…”

Section: L-~~~~~~~$supporting

confidence: 67%

“…When an artificial air current was driven through the larynx and phonation produced by stimulation of the recurrent nerve, additional stimulation of the superior laryngeal nerve at its entry in the crico-thyroid muscle caused an increase in pitch of more than one octave. On the other hand pitch remained unaltered with changes in air pressure [Dunker and Schlosshauer, 1958].…”

Section: Methodsmentioning

confidence: 90%

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Electromyography of Intrinsic Laryngeal Muscles

Buchthal

1959

Exp Physiol

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In man during phonation, an increased electrical activity was found in all the intrinsic adductor muscles of the larynx investigated. The change in electrical activity started one‐third to one‐half of a second before audible sound could be recorded by microphone. This latency probably reflects the time necessary to build up a minimum air current and pressure. Whenever it could be discriminated, the maximum frequency of single motor unit discharges was of the order of 20‐50 per second during phonation. This is in contradiction to Husson's theory that the frequency of vibration of the vocal cord during a tone of a given pitch is the result of a corresponding number of impulses to the muscle fibres. During phonation with increasing pitch the electrical activity increased considerably, as long as the increase in pitch occurred within the same register. The increase in electrical activity was adjusted to the level corresponding to a given pitch before the onset of audible sound. The pronounced electrical activity in the adductor muscle in the absence of phonation was inhibited 0 3 sec. before the onset of phonation. This complete inhibition persisted throughout the entire period of voice production. In the abductor muscles also there was a slight activity in the absence of phonation. This activity persisted even when breathing stopped. It was enhanced during inspiration and remained unaltered during expiration. Electromyographical findings are consistent with the assumptions (1) that the vibrational frequency of the vocal cords, and thereby the pitch of the sound produced, is determined by the active and passive tension exerted by the intrinsic laryngeal muscles, and (2) that the active force of sound production is the air pressure, which separates the margins of the glottis with periodic recoil of the vocal cords.

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Section: L-~~~~~~~$supporting

confidence: 67%

Section: Methodsmentioning

confidence: 90%

Electromyography of Intrinsic Laryngeal Muscles

Buchthal

1959

Exp Physiol

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“…He stim ulated the vocal folds with an electrical stimulus applied to the recurrent laryngeal nerves and provided air to the larynx from a source outside the animals body. However, the present residts are contrary to the data reported bv Dunker mid Schlosshauer [1] and Rubin [8] who list'd techniques similar to that used by Issliiki. The present results also do not agree with the findings of Kunze [3] who measured air flowing from the nose and mouth of adult males as fundam ental frequency was varied.…”

Section: Discussioncontrasting

confidence: 57%

“…Isshiki [3], experim enting with animals whose larynges were part ¡ally separated from their body, reported that increasing air flow resulted in a " slight rise in pitch within certain lim its" . However Dunker and Schlosshauer [1] and Rubin [8], using a technique similar to Isshiki, did not observe the above re lationship. Nor did Kunze [5] find a significant change in rate of air flow through intact hum an larynges as the fundam ental was varied.…”

mentioning

confidence: 99%

“…

Investigations concerning the relationship of air flow anti suitglottal air pressure to the fundam ental frequency of phonation have been carried out on excised human larynges [7,9], larynges partially removed from animals [1,2,3,8] and humans phonating with laryn geal structures intact [4,5], Müller [7| and van den Berg and Tan [9] were able to obtain changes in fundam ental frequency by varying the flow of air through an excised larynx. They found higher fundam entals accompanied greater air flow.

…”

mentioning

confidence: 99%

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