Effect of the Acoustic Reflex on the Impedance at the Eardrum Seventeen ears of 12 subjects with normal hearing were tested in both a laboratory and a clinical setting to study impedance changes in normal human ears associated with the acoustic reflex. Compliance and resistance at the eardrum were measured with middle ear muscles relaxed and contracted by means of a ... Research Article
Research Article  |   September 01, 1965
Effect of the Acoustic Reflex on the Impedance at the Eardrum
 
Author Affiliations & Notes
  • Alan S. Feldman
    Laboratory of Sensory Communication, Syracuse University, Syracuse, New York
  • Jozef Zwislocki
    Laboratory of Sensory Communication, Syracuse University, Syracuse, New York
Article Information
Research Articles
Research Article   |   September 01, 1965
Effect of the Acoustic Reflex on the Impedance at the Eardrum
Journal of Speech, Language, and Hearing Research, September 1965, Vol. 8, 213-222. doi:10.1044/jshr.0803.213
History: Received April 30, 1965
 
Journal of Speech, Language, and Hearing Research, September 1965, Vol. 8, 213-222. doi:10.1044/jshr.0803.213
History: Received April 30, 1965

Seventeen ears of 12 subjects with normal hearing were tested in both a laboratory and a clinical setting to study impedance changes in normal human ears associated with the acoustic reflex. Compliance and resistance at the eardrum were measured with middle ear muscles relaxed and contracted by means of a contralateral noise stimulus, respectively.

The reflex induced impedance changes were compared to similar impedance data obtained by other investigators, and to typical otosclerotic impedance values. The reflex is shown to affect the impedance by a decrease in compliance and a slight decrease in resistance.

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