Document Detail

Patterns of laryngeal electromyography and the activity of the respiratory system during spontaneous laughter.
MedLine Citation:
PMID:  16772517     Owner:  NLM     Status:  MEDLINE    
Laryngeal muscle electromyography (EMG) and measures of the behavior of the respiratory system have been made during spontaneous laughter in two groups of subjects. The smaller group also had a direct measure of tracheal pressure during this behavior. Laryngeal adductors such as the thyroarytenoid (TA) and lateral cricoarytenoid (LCA) exhibited brief high-amplitude bursts of activity, at a rate of approximately 5 Hz, which were usually associated on a 1 : 1 basis with the sound bursts (ha ha ha) of laughter. The laryngeal abductor, posterior cricoarytenoid (PCA), also showed bursts of activity that were out of phase with TA and LCA. The cricothyroid (CT) was only weakly, if at all, modulated during the bursting activity of the other laryngeal muscles. Tracheal pressure usually exhibited positive pressure pulses during laughter that were often, but not always, temporally correlated to the bursts of laryngeal adductor EMG activity. Such pressure modulations appeared to precisely determine when-and if-phonation was produced during the laugh. During laughter, laryngeal EMG is highly stereotyped both within and between subjects. In most instances, this activity appears to be supported by coordinated pulses of tracheal pressure. The periaqueductal gray (PAG) has been shown in animal studies to produce emotionally indicative vocalizations, in which the laryngeal and respiratory system are coordinated. Therefore, it is suggested that the PAG is involved with the production of laughter.
Erich S Luschei; Lorraine O Ramig; Eileen M Finnegan; Kristen K Baker; Marshall E Smith
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural    
Journal Detail:
Title:  Journal of neurophysiology     Volume:  96     ISSN:  0022-3077     ISO Abbreviation:  J. Neurophysiol.     Publication Date:  2006 Jul 
Date Detail:
Created Date:  2006-06-14     Completed Date:  2006-08-04     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0375404     Medline TA:  J Neurophysiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  442-50     Citation Subset:  IM    
Department of Speech, Pathology and Audiology, University of Iowa, Iowa City, Iowa, USA.
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MeSH Terms
Action Potentials / physiology
Laryngeal Muscles / innervation*,  physiology*
Laryngeal Nerves / physiology
Laughter / physiology*
Motor Activity / physiology
Periaqueductal Gray / physiology
Respiratory Physiological Phenomena*
Respiratory System / innervation*
Trachea / physiology
Grant Support

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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