Abstract
Several contradictory studies have been published regarding the effect of selective attention on cochlear mechanics, possibly modulated through efferent pathways. Click-evoked otoacoustic emissions have been proposed as a highly sensitive tool for testing the hypothesis of such a modulation. In this study, two other types of evoked otoacoustic emissions (i.e. distortion products and stimulus frequency emissions between 1 and 4 kHz) were measured on 20 normal subjects in absence and presence of a visual selective attention task. The duration of measurements at a given frequency was short enough to eliminate possible artefacts due to long-time averaging. No significant change was observed in these signals, considered as probes of cochlear micromechanics. It is concluded that in this set of experimental conditions, selective attention has a negligible effect on peripheral sensitivity.
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