Time course of the medial olivocochlear efferent effect on otoacoustic emissions in humans
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Updated: Oct 13, 2026

Infant Auditory Processing and Event-related Brain Oscillations
Published on: July 1, 2015
1Neurosciences et Systèmes Sensoriels, Perception et Mécanismes Auditifs-CNRS UPRESA 5020-8, Lyon, France.
Abstract:
The time course of the medial olivocochlear efferent system has been studied in humans, using the suppressive effect of a contralateral broad-band noise (CBBN) on 2f1-f2 distortion product otoacoustic emissions (DPOAE) amplitude. DPOAE were recorded with F2 at 1.5 kHz, with a temporal resolution of 2.6 s, in the presence and absence of a 40 dB SL continuous CBBN, whose duration ranged between 30 s and 20 min. The CBBN suppressive effect on DPOAE amplitude was greatest from the first 2.6 s, and was sustained for 20 min. At the CBBN offset, when the CBBN duration was > or = 2 min, DPOAE amplitude continued to increase for > 1 min, showing an efferent effect outlasting CBBN stimulation.
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