scholarly journals Considering distortion product otoacoustic emission fine structure in measurements of the medial olivocochlear reflex

2009 ◽  
Vol 125 (3) ◽  
pp. 1584-1594 ◽  
Author(s):  
Carolina Abdala ◽  
Srikanta K. Mishra ◽  
Tracy L. Williams
Keyword(s):  
Fine Structure ◽  
Otoacoustic Emission ◽  
Distortion Product Otoacoustic Emission ◽  
Medial Olivocochlear Reflex ◽  
Distortion Product ◽  
Medial Olivocochlear

scholarly journals Correlation and Reliability of Behavioral and Otoacoustic-Emission Estimates of Contralateral Medial Olivocochlear Reflex Strength in Humans

2021 ◽  
Vol 15 ◽  
Author(s):  
Miriam I. Marrufo-Pérez ◽  
Peter T. Johannesen ◽  
Enrique A. Lopez-Poveda
Keyword(s):  
Otoacoustic Emission ◽  
Acoustic Stimulation ◽  
Broadband Noise ◽  
Distortion Product Otoacoustic Emission ◽  
Detection Thresholds ◽  
Medial Olivocochlear Reflex ◽  
Distortion Product ◽  
Healthy Humans ◽  
Medial Olivocochlear ◽  
Tone Detection

The roles of the medial olivocochlear reflex (MOCR) in human hearing have been widely investigated but remain controversial. We reason that this may be because the effects of MOCR activation on cochlear mechanical responses can be assessed only indirectly in healthy humans, and the different methods used to assess those effects possibly yield different and/or unreliable estimates. One aim of this study was to investigate the correlation between three methods often employed to assess the strength of MOCR activation by contralateral acoustic stimulation (CAS). We measured tone detection thresholds (N = 28), click-evoked otoacoustic emission (CEOAE) input/output (I/O) curves (N = 18), and distortion-product otoacoustic emission (DPOAE) I/O curves (N = 18) for various test frequencies in the presence and the absence of CAS (broadband noise of 60 dB SPL). As expected, CAS worsened tone detection thresholds, suppressed CEOAEs and DPOAEs, and horizontally shifted CEOAE and DPOAE I/O curves to higher levels. However, the CAS effect on tone detection thresholds was not correlated with the horizontal shift of CEOAE or DPOAE I/O curves, and the CAS-induced CEOAE suppression was not correlated with DPOAE suppression. Only the horizontal shifts of CEOAE and DPOAE I/O functions were correlated with each other at 1.5, 2, and 3 kHz. A second aim was to investigate which of the methods is more reliable. The test–retest variability of the CAS effect was high overall but smallest for tone detection thresholds and CEOAEs, suggesting that their use should be prioritized over the use of DPOAEs. Many factors not related with the MOCR, including the limited parametric space studied, the low resolution of the I/O curves, and the reduced numbers of observations due to data exclusion likely contributed to the weak correlations and the large test–retest variability noted. These findings can help us understand the inconsistencies among past studies and improve our understanding of the functional significance of the MOCR.

Distortion-product otoacoustic emission fine structure as an indicator of combination-tone-mediated masking release

2015 ◽  
Vol 137 (4) ◽  
pp. 2408-2409
Author(s):  
James D. Lewis ◽  
Emily C. Clark ◽  
Judy G. Kopun ◽  
Walt Jesteadt ◽  
Stephen T. Neely ◽  
...  
Keyword(s):  
Fine Structure ◽  
Otoacoustic Emission ◽  
Distortion Product Otoacoustic Emission ◽  
Distortion Product ◽  
Masking Release

Evaluating the Function of the Medial Olivocochlear Bundle in Patients With Bilateral Tinnitus

2020 ◽  
Vol 63 (6) ◽  
pp. 1969-1978
Author(s):  
Lin-Hua Cheng ◽  
Chih-Hung Wang ◽  
Rou-Huei Lu ◽  
Yu-Fu Chen
Keyword(s):  
Otoacoustic Emission ◽  
Clinical Test ◽  
Emission Measurement ◽  
Distortion Product Otoacoustic Emission ◽  
Contralateral Noise ◽  
Distortion Product ◽  
Speech In Noise ◽  
Medial Olivocochlear ◽  
Test Outcomes ◽  
Medial Olivocochlear Bundle

Purpose No study has investigated the effects of contralateral noise (CN) on speech-in-noise perception (SINP) in listeners with tinnitus. The mechanisms underlying the involvement of medial olivocochlear (MOC) reflex with SINP remain to be elucidated. This study aimed to investigate the MOC function in patients with bilateral tinnitus by measuring distortion product otoacoustic emission and SINP. Method Eighteen patients with bilateral tinnitus (one male and 17 females; age: M ± SD = 45.61 ± 10.18 years) and 19 listeners without tinnitus (six males and 13 females; age: M ± SD = 34.11 ± 8.35 years) were recruited for the study. Each subject underwent distortion product otoacoustic emission measurement and the SINP test for both ears. The effects of CN on these two measurements were compared between tinnitus ears (TEs) and no-tinnitus ears (NTEs). Results The presence of CN significantly reduced distortion product (DP) amplitudes and improved SINP for TEs, and the amounts of DP suppression and SINP improvement were similar to those in NTEs. Improvement of SINP was positively correlated with DP suppression at 6185 Hz for NTEs and at 1640 Hz for TEs. Conclusions The results of this study suggest that the amounts of DP suppression and SINP improvement were similar between listeners with and without tinnitus. For both ear groups, the MOC reflex was involved with SINP at specific frequencies. Any clinical test outcomes with regard to the MOC bundle in patients with tinnitus should be interpreted with caution until further studies are conducted.

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