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Front Psychol. 2012 Feb 13;3:30. doi: 10.3389/fpsyg.2012.00030. eCollection 2012.

Cognitive task demands modulate the sensitivity of the human cochlea.

Author information

  • 1Program in Behavioral and Cognitive Neuroscience, Department of Psychology, University of Florida Gainesville, FL, USA.

Abstract

Recent studies lead to the conclusion that focused attention, through the activity of corticofugal and medial olivocochlear (MOC) efferent pathways, modulates activity at the most peripheral aspects of the auditory system within the cochlea. In two experiments, we investigated the effects of different intermodal attention manipulations on the response of outer hair cells (OHCs), and the control exerted by the MOC efferent system. The effect of the MOCs on OHC activity was characterized by measuring the amplitude and rapid adaptation time course of distortion product otoacoustic emissions (DPOAEs). In the first, DPOAE recordings were compared while participants were reading a book and counting the occurrence of the letter "a" (auditory-ignoring) and while counting either short- or long-duration eliciting tones (auditory-attending). In the second, DPOAEs were recorded while subjects watched muted movies with subtitles (auditory-ignoring/visual distraction) and were compared with DPOAEs recorded while subjects counted the same tones (auditory-attending) as in Experiment 1. In both Experiments 1 and 2, the absolute level of the averaged DPOAEs recorded during the auditory-ignoring condition was statistically higher than that recorded in the auditory-attending condition. Efferent-induced rapid adaptation was evident in all DPOAE contours, under all attention conditions, suggesting that two medial efferent processes act independently to determine rapid adaptation, which is unaffected by attention, and the overall DPOAE level, which is significantly affected by changes in the focus of attention.

KEYWORDS:

DPOAE; MOC; corticofugal pathways; distortion product otoacoustic emission; human; medial olivocochlear efferents; selective auditory attention

PMID:
22347870
[PubMed]
PMCID:
PMC3277933
Free PMC Article

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