MIDDLE-EAR MUSCLE EFFECTS ON LOW-INTENSITY SOUNDS.
HUMAN ENGINEERING LABS ABERDEEN PROVING GROUND MD
Pagination or Media Count:
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
- Anatomy and Physiology