Accession Number : AD0631360

Title :   MIDDLE-EAR MUSCLE EFFECTS ON LOW-INTENSITY SOUNDS.

Descriptive Note : Technical memo.,

Corporate Author : HUMAN ENGINEERING LABS ABERDEEN PROVING GROUND MD

Personal Author(s) : Price,G. Richard

Report Date : NOV 1965

Pagination or Media Count : 18

Abstract : Experiments in which loudness judgments were made for a tone in one ear while another tone was present in the opposite ear have questioned the role played by the middle -ear muscles. Loudness judgments probably involve both central and peripheral factors. In order to evaluate the peripheral factors, cochlear potentials were measured on 12 lightly anesthetized cats. There were changes in the cochlear potential to pure tones in one ear (ranging in frequency from 0.2 to 10 kilocycles) from middle-ear muscle activity elicited by contralateral two-second pure-tone bursts (ranging from 0.65 to 5 kilocycles) as the tones producing the cochlear potentials were varied in intensity. As the intensity of the measured tone was varied, the size of the effect (in dB) remained constant. (Author)

Descriptors :   (*VESTIBULAR APPARATUS, *MUSCLES), (*HEARING, VESTIBULAR APPARATUS), INTENSITY, SOUND, AUDITORY PERCEPTION

Subject Categories : Anatomy and Physiology

Distribution Statement : APPROVED FOR PUBLIC RELEASE