Auditory Efferents Facilitate Sound Localization in Noise in Humans: Figure 1.

Andéol, Guillaume; Guillaume, Anne; Micheyl, Christophe; Savel, Sophie; Pellieux, Lionel; Moulin, Annie

doi:10.1523/jneurosci.0248-11.2011

Cited by 67 publications

(48 citation statements)

References 28 publications

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“…However, a clinical MOCR assay also is of more general interest, and could be used for other applications such as diagnostic testing for various pathologies (summarized in Kumar et al, 2013), tracking improvements in listening strategies due to increased MOC functioning (reviewed in Guinan, 2012), and identifying those who could benefit from auditory training (summarized in Guinan, 2011). It could also be part of a test battery to select people with exceptional performance potential (e.g., Andeol et al, 2011 show that MOCR strength is correlated with localization ability at low SNRs). Requirements for classification of ears according to MOCR strength in these contexts are not so severe, and there is likely more time for making quality measurements compared to the fast, massscreening done in HCPs.…”

Section: E a General Clinical Testmentioning

confidence: 99%

Otoacoustic-emission-based medial-olivocochlear reflex assays for humans

Marshall

Miller

Guinan

et al. 2014

The Journal of the Acoustical Society of America

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Otoacoustic emission (OAE) tests of the medial-olivocochlear reflex (MOCR) in humans were assessed for viability as clinical assays. Two reflection-source OAEs [TEOAEs: transient-evoked otoacoustic emissions evoked by a 47 dB sound pressure level (SPL) chirp; and discrete-tone SFOAEs: stimulus-frequency otoacoustic emissions evoked by 40 dB SPL tones, and assessed with a 60 dB SPL suppressor] were compared in 27 normal-hearing adults. The MOCR elicitor was a 60 dB SPL contralateral broadband noise. An estimate of MOCR strength, MOCR%, was defined as the vector difference between OAEs measured with and without the elicitor, normalized by OAE magnitude (without elicitor). An MOCR was reliably detected in most ears. Within subjects, MOCR strength was correlated across frequency bands and across OAE type. The ratio of across-subject variability to within-subject variability ranged from 2 to 15, with wideband TEOAEs and averaged SFOAEs giving the highest ratios. MOCR strength in individual ears was reliably classified into low, normal, and high groups. SFOAEs using 1.5 to 2 kHz tones and TEOAEs in the 0.5 to 2.5 kHz band gave the best statistical results. TEOAEs had more clinical advantages. Both assays could be made faster for clinical applications, such as screening for individual susceptibility to acoustic trauma in a hearing-conservation program. [http://dx

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Section: E a General Clinical Testmentioning

confidence: 99%

Otoacoustic-emission-based medial-olivocochlear reflex assays for humans

Marshall

Miller

Guinan

et al. 2014

The Journal of the Acoustical Society of America

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“…The medial efferent system is important for the localization of the sound source [1] , auditory attention [2] , protection of the cochlea against acoustic injury [3,4] , improved detection of acoustic signals, and improved speech perception in the presence of noise [5,6] . The medial olivocochlear bundle (MOCB) originates from the nuclei in the medial olivary nucleus.…”

Section: Introductionmentioning

confidence: 99%

Effect of Contralateral Noise on Acoustic Reflex Latency Measures

Prabhu

Divyashree²,

Neeraja³

et al. 2016

Int Adv Otol

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OBJECTIVE:The present study was conducted to determine the effect of contralateral broadband noise on acoustic reflex latency (ARL). MATERIALS and METHODS:Acoustic reflex latency changes for 10 and 90% on-and off-time acoustic reflexes with contralateral broadband noise were measured in 30 adults with normal hearing. RESULTS:The results of the study demonstrate that there was a latency prolongation for reflex on-time (10 and 90%) and latency reduction for reflex off-time (10 and 90%). This effect was seen for 500, 1000, and 2000 Hz reflex-eliciting signals. The results also showed that there was no effect of gender on latency changes in acoustic reflexes. CONCLUSIONS:Latency changes may explain efferent auditory system mechanisms used for the protection of the cochlea and improvement in speech perception. Thus, contralateral changes of ARL can serve as an additional tool to assess the efferent system functioning.

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“…In humans, the auditory efferent system is active in sound localization in noise (Andeol et al, 2011) as well as in perceptual learning (de Boer and Thornton, 2008). The role of the auditory efferents in facilitating speech perception in noise (de Boer et al, 2012;Kumar and Vanaja, 2004) and mediating attention-related modulation of cochlear function (e.g., Garinis et al, 2011a;Maison et al, 2001) has also been explored.…”

Section: Introductionmentioning

confidence: 99%

Aging of the medial olivocochlear reflex and associations with speech perception

Abdala

Dhar

Ahmadi

et al. 2014

The Journal of the Acoustical Society of America

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The medial olivocochlear reflex (MOCR) modulates cochlear amplifier gain and is thought to facilitate the detection of signals in noise. High-resolution distortion product otoacoustic emissions (DPOAEs) were recorded in teens, young, middle-aged, and elderly adults at moderate levels using primary tones swept from 0.5 to 4 kHz with and without a contralateral acoustic stimulus (CAS) to elicit medial efferent activation. Aging effects on magnitude and phase of the 2f1-f2 DPOAE and on its components were examined, as was the link between speech-in-noise performance and MOCR strength. Results revealed a mild aging effect on the MOCR through middle age for frequencies below 1.5 kHz. Additionally, positive correlations were observed between strength of the MOCR and performance on select measures of speech perception parsed into features. The elderly group showed unexpected results including relatively large effects of CAS on DPOAE, and CAS-induced increases in DPOAE fine structure as well as increases in the amplitude and phase accumulation of DPOAE reflection components. Contamination of MOCR estimates by middle ear muscle contractions cannot be ruled out in the oldest subjects. The findings reiterate that DPOAE components should be unmixed when measuring medial efferent effects to better consider and understand these potential confounds.

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Auditory Efferents Facilitate Sound Localization in Noise in Humans: Figure 1.

Cited by 67 publications

References 28 publications

Otoacoustic-emission-based medial-olivocochlear reflex assays for humans

Otoacoustic-emission-based medial-olivocochlear reflex assays for humans

Effect of Contralateral Noise on Acoustic Reflex Latency Measures

Aging of the medial olivocochlear reflex and associations with speech perception

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