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Journal of Speech and Hearing Research Vol.34 791-795 August 1991.
© American Speech-Language-Hearing Association
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Frequency Response of the Fourcin Electroglottograph and Measurement of Temporal Aspects of Laryngeal Movement During Swallowing

Adrienne L. Perlman 1
Haixiang Liang 2
1 Audiology/Speech Pathology Service VA Medical Center Iowa City
2 Department of Electrical Engineerng University of Iowa, Iowa City

The purpose of this investigation was to study the frequency response of a modified Fourcin EGG at frequencies associated with the slow varying laryngeal movement of swallowing and to compare those findings with the response characteristics of the EGG at frequencies associated with phonation. Frequency-dependent differences were found. At very low frequencies the EGG output was found to be the derivative of the changes in neck impedance; at higher frequencies the EGG output directly represented the changes in neck impedance. Three of the four phases of the pharyngeal stage of the swallow are represented by the EGG signal.

KEY WORDS: electroglottograph, EGG, swallowing, frequency response, instrumentation

Submitted on January 12, 1990
Accepted on August 31, 1990


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