scholarly journals Influence of acute hyperglycemia on otoacoustic emissions and the medial olivocochlear reflex

2012 ◽  
Vol 131 (2) ◽  
pp. 1296-1306 ◽  
Author(s):  
Peter G. Jacobs ◽  
Dawn Konrad-Martin ◽  
Garnett P. Mcmillan ◽  
Daniel McDermott ◽  
Stephen A. Fausti ◽  
...  
Keyword(s):  
Otoacoustic Emissions ◽  
Acute Hyperglycemia ◽  
Medial Olivocochlear Reflex ◽  
Medial Olivocochlear

Does Hyperandrogenism Affect the Otoacoustic Emissions and Medial Olivocochlear Reflex in Female Adults?

2013 ◽  
Vol 34 (5) ◽  
pp. 784-789 ◽  
Author(s):  
Erdem Eren ◽  
Ece Harman ◽  
Seçil Arslanoğlu ◽  
Kazm Önal ◽  
Hüseyin Katlmiş
Keyword(s):  
Otoacoustic Emissions ◽  
Medial Olivocochlear Reflex ◽  
Medial Olivocochlear

Medial Olivocochlear Reflex Effects on Amplitude Growth Functions of Long- and Short-Latency Components of Click-Evoked Otoacoustic Emissions in Humans

2021 ◽  
Author(s):  
Shawn Goodman ◽  
Sriram Boothalingam ◽  
Jeffery T Lichtenhan
Keyword(s):  
Otoacoustic Emissions ◽  
Dynamic Range ◽  
Short Latency ◽  
Medial Olivocochlear Reflex ◽  
Time Frequency ◽  
Growth Functions ◽  
Sound Levels ◽  
Amplitude Attenuation ◽  
Slope Change ◽  
Medial Olivocochlear

Functional outcomes of medial olivocochlear reflex (MOCR) activation, such as improved hearing in background noise and protection from noise damage, involve moderate to high sound levels. Previous noninvasive measurements of MOCR in humans focused primarily on otoacoustic emissions (OAEs) evoked at low sound levels. Interpreting MOCR effects on OAEs at higher levels is complicated by the possibility of the middle-ear muscle reflex and by components of OAEs arising from different locations along the length of the cochlear spiral. We overcame these issues by presenting click stimuli at a very slow rate and by time-frequency windowing the resulting click-evoked (CE)OAEs into short-latency (SL) and long-latency (LL) components. We characterized the effects of MOCR on CEOAE components using multiple measures to more comprehensively assess these effects throughout much of the dynamic range of hearing. These measures included CEOAE amplitude attenuation, equivalent input attenuation, phase, and slope of growth functions. Results show that MOCR effects are smaller on SL components than LL components, consistent with SL components being generated slightly basal of the characteristic frequency region. Amplitude attenuation measures showed the largest effects at the lowest stimulus levels, but slope change and equivalent input attenuation measures did not decrease at higher stimulus levels. These latter measures are less commonly reported and may provide insight into the variability in listening performance and noise susceptibility seen across individuals.

Effects of Type 2 Diabetes on Otoacoustic Emissions and the Medial Olivocochlear Reflex

2014 ◽  
Vol 150 (6) ◽  
pp. 1033-1039 ◽  
Author(s):  
Erdem Eren ◽  
Ece Harman ◽  
Seçil Arslanoğlu ◽  
Kazım Önal
Keyword(s):  
Type 2 Diabetes ◽  
Otoacoustic Emissions ◽  
Medial Olivocochlear Reflex ◽  
Medial Olivocochlear

scholarly journals A Time-Course-Based Estimation of the Human Medial Olivocochlear Reflex Function Using Clicks

2021 ◽  
Vol 15 ◽  
Author(s):  
Sriram Boothalingam ◽  
Shawn S. Goodman ◽  
Hilary MacCrae ◽  
Sumitrajit Dhar
Keyword(s):  
Auditory Processing ◽  
Otoacoustic Emissions ◽  
Time Course ◽  
Broadband Noise ◽  
Activity Data ◽  
Medial Olivocochlear Reflex ◽  
Clinical Method ◽  
Click Train ◽  
Auditory Efferent System ◽  
Medial Olivocochlear

The auditory efferent system, especially the medial olivocochlear reflex (MOCR), is implicated in both typical auditory processing and in auditory disorders in animal models. Despite the significant strides in both basic and translational research on the MOCR, its clinical applicability remains under-utilized in humans due to the lack of a recommended clinical method. Conventional tests employ broadband noise in one ear while monitoring change in otoacoustic emissions (OAEs) in the other ear to index efferent activity. These methods, (1) can only assay the contralateral MOCR pathway and (2) are unable to extract the kinetics of the reflexes. We have developed a method that re-purposes the same OAE-evoking click-train to also concurrently elicit bilateral MOCR activity. Data from click-train presentations at 80 dB peSPL at 62.5 Hz in 13 young normal-hearing adults demonstrate the feasibility of our method. Mean MOCR magnitude (1.7 dB) and activation time-constant (0.2 s) are consistent with prior MOCR reports. The data also suggest several advantages of this method including, (1) the ability to monitor MEMR, (2) obtain both magnitude and kinetics (time constants) of the MOCR, (3) visual and statistical confirmation of MOCR activation.

scholarly journals Early Maturation of Evoked Otoacoustic Emissions and Medial Olivocochlear Reflex in Preterm Neonates

2006 ◽  
Vol 59 (2) ◽  
pp. 305-308 ◽  
Author(s):  
René Chabert ◽  
Matthieu J Guitton ◽  
Daniel Amram ◽  
Alain Uziel ◽  
Rémy Pujol ◽  
...  
Keyword(s):  
Otoacoustic Emissions ◽  
Preterm Neonates ◽  
Medial Olivocochlear Reflex ◽  
Early Maturation ◽  
Medial Olivocochlear

scholarly journals The Medial Olivocochlear Reflex Is Unlikely to Play a Role in Listening Difficulties in Children

2019 ◽  
Vol 23 ◽  
pp. 233121651987094 ◽  
Author(s):  
Sriram Boothalingam ◽  
Chris Allan ◽  
Prudence Allen ◽  
David W. Purcell
Keyword(s):  
Auditory Processing ◽  
Otoacoustic Emissions ◽  
Signal To Noise Ratio ◽  
Stimulus Frequency ◽  
Auditory Processing Disorder ◽  
High Signal ◽  
Medial Olivocochlear Reflex ◽  
Distortion Product ◽  
Medial Olivocochlear ◽  
Age Range

The medial olivocochlear reflex (MOCR) has been implicated in several auditory processes. The putative role of the MOCR in improving speech perception in noise is particularly relevant for children who complain of listening difficulties (LiD). The hypothesis that the MOCR may be impaired in individuals with LiD or auditory processing disorder has led to several investigations but without consensus. In two related studies, we compared the MOCR functioning of children with LiD and typically developing (TD) children in the same age range (7–17 years). In Study 1, we investigated ipsilateral, contralateral, and bilateral MOCR using forward-masked click-evoked otoacoustic emissions (CEOAEs; n = 17 TD, 17 LiD). In Study 2, we employed three OAE types: CEOAEs ( n = 16 TD, 21 LiD), stimulus frequency OAEs ( n = 21 TD, 30 LiD), and distortion product OAEs ( n = 17 TD, 22 LiD) in a contralateral noise paradigm. Results from both studies suggest that the MOCR functioning is not significantly different between the two groups. Some likely reasons for differences in findings among published studies could stem from the lack of strict data quality measures (e.g., high signal-to-noise ratio, control for the middle ear muscle reflex) that were enforced in the present study. The inherent variability of the MOCR, the subpar reliability of current MOCR methods, and the heterogeneity in auditory processing deficits that underlie auditory processing disorder make detecting clinically relevant differences in MOCR function impractical using current methods.

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