3rd French conference on acoustics
J. Phys. IV France 04 (1994) C5-387-C5-390
Système efférent, masquage central et perception dans le bruitC. MICHEYL1, 2 and L. COLLET1
1 Laboratoire de Physiologie Sensorielle "Audition et Voix", URA 1447 du CNRS, Pavillon U, Hôpital E. Herriot, 3 place d'Arsonval, 69437 Lyon cedex, France
2 Laboratoire d'Etude et d'Analyse de la Cognition et des Modèles, Institut de Psychologie, 5 avenue P. Mendès-France, CP. 11, 69676 Bron cedex, France
In order to investigate the role of the auditory efferents in perception, the controlateral suppression of evoked otoacoustic emissions (EOAEs) was examined together with 1) central masking and 2) detection in noise in normal hearing subjects. The first study, concerning the relations between the contralateral suppression of EOAEs and central masking at 1 kHz, put into evidence the existence of a significant negative correlation between the amount of central masking obtained with a delay of 20 ms between the test and the mask and the modifications of the amplitude of EOAEs induced around 1 kHz by a contralateral 30 dBSL broadband noise stimulation. In the second study, a correlation was found between the mean equivalent attenuation of EOAEs and the variation of the tone-in-noise detection threshold, both induced by a contralateral 30 dBSL broadband noise stimulation. These results support the hypothesis that the crossed part of the medial olivo-cochlear system is actually involved in auditory perception in humans.
© EDP Sciences 1994