HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text Free Full Text (PDF) Free All Versions of this Article: 97/3/858    most recent 00087.2004v1 Submit a response Alert me when this article is cited Alert me when eLetters are posted Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in ISI Web of Science Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via ISI Web of Science (11) Citing Articles via Google Scholar Google Scholar Articles by Poletto, C. J. Articles by Ludlow, C. L. Search for Related Content PubMed PubMed Citation Articles by Poletto, C. J. Articles by Ludlow, C. L.

Correspondence between laryngeal vocal fold movement and muscle activity during speech and nonspeech gestures

Laryngeal and Speech Section, National Institute of Neurological Disorders and Stroke, Bethesda, Maryland 20892

Submitted 28 January 2004 ; accepted in final form 30 April 2004

To better understand the role of each of the laryngeal muscles in producing vocal fold movement, activation of these muscles was correlated with laryngeal movement during different tasks such as sniff, cough or throat clear, and speech syllable production. Four muscles [the posterior cricoarytenoid, lateral cricoarytenoid, cricothyroid (CT), and thyroarytenoid (TA)] were recorded with bipolar hooked wire electrodes placed bilaterally in four normal subjects. A nasoendoscope was used to record vocal fold movement while simultaneously recording muscle activity. Muscle activation level was correlated with ipsilateral vocal fold angle for vocal fold opening and closing. Pearson correlation coefficients and their statistical significance were computed for each trial. Significant effects of muscle (P 0.0005) and task (P = 0.034) were found on the r (transformed to Fisher's Z') values. All of the posterior cricoarytenoid recordings related significantly with vocal opening, whereas CT activity was significantly correlated with opening only during sniff. The TA and lateral cricoarytenoid activities were significantly correlated with vocal fold closing during cough. During speech, the CT and TA activity correlated with both opening and closing. Laryngeal muscle patterning to produce vocal fold movement differed across tasks; reciprocal muscle activity only occurred on cough, whereas speech and sniff often involved simultaneous contraction of muscle antagonists. In conclusion, different combinations of muscle activation are used for biomechanical control of vocal fold opening and closing movements during respiratory, airway protection, and speech tasks.

correlation; electromyography; larynx; nasolaryngoscopy; muscle activation; intrinsic laryngeal muscles

This article has been cited by other articles:

				F. C. Holsinger, M. S. Kies, Y. E. Weinstock, J. S. Lewin, S. Hajibashi, D. D. Nolen, R. Weber, and O. Laccourreye Examination of the Larynx and Pharynx N. Engl. J. Med., January 17, 2008; 358(3): e2 - e2. [PDF]

				V. M. Henriquez, G. M. Schulz, S. Bielamowicz, and C. L. Ludlow Laryngeal reflex responses are not modulated during human voice and respiratory tasks J. Physiol., December 15, 2007; 585(3): 779 - 789. [Abstract] [Full Text] [PDF]