scholarly journals Suppression of Otoacoustic Emission using Schroeder Harmonic Complexes as Suppressing Stimuli

2017 ◽  
Vol 16 (1) ◽  
Author(s):  
Fazlin Binti Suratman
Keyword(s):  
Hair Cell ◽  
Outer Hair Cell ◽  
Cell Activity ◽  
Otoacoustic Emission ◽  
Protective Mechanism ◽  
Distortion Product ◽  
Amplitude Difference ◽  
Active Mechanism ◽  
Contralateral Ear ◽  
Medial Olivocochlear

Introduction: Medial Olivocochlear Reflex (MOCR) causes inhibition of outer hair cell activity upon noise stimulation and acts as protective mechanism of the ear against noise. MOCR  can be recorded through the suppression of Otoacoustic Emission (OAE). The mechanism of MOCR function was still unclear and whether the function is affected by the phase of incoming noise requires further investigation. This research aimed to identify the effect of MOCR activity ; i) at different frequency; ii) when using different phases of Schroeder harmonic complexes as the suppressor noise.  Materials and method: Twenty six normal hearing subjects were recruited. The suppression was analysed by looking at amplitude difference of Distortion Product of Otoacoustic Emission (DPOAE) in the absence of noise and in the presence of noise in contralateral ear, at different tested frequencies (1, 1.5, 2, 3, 4, 6 kHz).  Results: There was significantly higher suppression amplitude for frequency 1-2 kHz compared to higher frequencies (p<0.05). Significant higher suppression was observed when negative phase of Schroeder harmonic complexes (c: -1) was used as suppressing stimuli compared to that of positive phase (c: +1) (p<0.05).  Conclusion: These findings showed that MOCR; i) is enhanced at mid-frequency region, and ii) has the ability to inhibit the outer hair cell active mechanism differently upon stimulation with different phases of noise.

Effect of mastoid drilling on hearing of the contralateral ear

2013 ◽  
Vol 127 (10) ◽  
pp. 952-956 ◽  
Author(s):  
A Goyal ◽  
P P Singh ◽  
A Vashishth
Keyword(s):  
Hearing Loss ◽  
High Frequency ◽  
Otoacoustic Emissions ◽  
Pure Tone Audiometry ◽  
Otoacoustic Emission ◽  
Prospective Clinical Study ◽  
Distortion Product Otoacoustic Emission ◽  
High Frequencies ◽  
Distortion Product ◽  
Contralateral Ear

AbstractObjectives:This study aimed to: understand the effect that high intensity noise associated with drilling (during otological surgery) has on hearing in the contralateral ear; determine the nature of hearing loss, if any, by establishing whether it is temporary or persistent; and examine the association between hearing loss and various drill parameters.Methods:A prospective clinical study was carried out at a tertiary centre. Thirty patients with unilateral cholesteatoma and normal contralateral hearing were included. Patients were evaluated pre-operatively and for five days following surgery using high frequency pure tone audiometry, and low and high frequency transient evoked and distortion product otoacoustic emission testing.Results:The findings revealed statistically significant changes in distortion product otoacoustic emissions at high frequencies (p = 0.016), and in transient evoked otoacoustic emissions at both low and high frequencies (p = 0.035 and 0.021, respectively). There was a higher statistical association between otoacoustic emission changes and cutting burrs compared with diamond burrs.Conclusion:Drilling during mastoid surgery poses a threat to hearing in the contralateral ear due to noise and vibration conducted transcranially.

Early Evidence of Cochlear Damage in a Large Sample of Percussionists

2005 ◽  
Vol 20 (3) ◽  
pp. 135-139
Author(s):  
Jodee A Pride ◽  
David R Cunningham
Keyword(s):  
Hearing Loss ◽  
Hair Cell ◽  
Otoacoustic Emissions ◽  
Outer Hair Cell ◽  
Cell Damage ◽  
Normal Hearing ◽  
Outer Hair Cells ◽  
Sensory Loss ◽  
Distortion Product ◽  
Hair Cell Damage

Percussionists can be exposed to intermittent sound stimuli that exceed 145 dB SPL, although damage may occur to the outer hair cells at levels of 120 dB SPL. The present study measured distortion-product otoacoustic emissions (DPOAEs) in a group of 86 normal-hearing percussionists and 39 normal-hearing nonpercussionists. Results indicate that normal-hearing percussionists have lower DPOAE amplitudes than normal-hearing nonpercussionists. DPOAE amplitudes were significantly lower at 6000 Hz in both the left and right ears for percussionists. Percussionists also more frequently had absent DPOAEs, with the greatest differences occurring at 6000 Hz (absent DPOAEs in 25% of percussionists vs 10% of nonpercussionists). When all frequencies are considered as a group, 33% of the percussionists had an absent DPOAE in either ear at some frequency, compared to only 23% of the nonpercussionists. Otoacoustic emissions are more sensitive to outer hair cell damage than pure-tone threshold measurements and can serve as an important measurement of sensory loss (i.e., outer hair cell damage) in musicians before the person perceives the hearing loss. DPOAE monitoring for musicians, along with appropriate education and intervention, might help prevent or minimize music-induced hearing loss.

scholarly journals Evaluation of outer hair cell function and medial olivocochlear efferent system in patients with type II diabetes mellitus

2014 ◽  
Vol 44 ◽  
pp. 150-156 ◽  
Author(s):  
Hayriye KARABULUT ◽  
İsmail KARABULUT ◽  
Muharrem DAĞLI ◽  
Yıldırım Ahmet BAYAZIT ◽  
Şule BİLEN ◽  
...  
Keyword(s):  
Diabetes Mellitus ◽  
Hair Cell ◽  
Type Ii Diabetes ◽  
Outer Hair Cell ◽  
Cell Function ◽  
Type Ii Diabetes Mellitus ◽  
Type Ii ◽  
Efferent System ◽  
Medial Olivocochlear ◽  
Medial Olivocochlear Efferent System

scholarly journals Spontaneous otoacoustic emission recordings during contralateral pure-tone activation of medial olivocochlear reflex

2017 ◽  
Vol 104 (2) ◽  
pp. 171-182
Author(s):  
E Bulut ◽  
L Öztürk
Keyword(s):  
Pure Tone ◽  
Outer Hair Cell ◽  
Basilar Membrane ◽  
Otoacoustic Emission ◽  
Frequency Discrimination ◽  
Frequency Range ◽  
Unilateral Deafness ◽  
Transient Evoked Otoacoustic Emission ◽  
Medial Olivocochlear ◽  
Bilateral Deafness

We hypothesized that cochlear frequency discrimination occurs through medial olivocochlear efferent (MOCE)-induced alterations in outer hair cell (OHC) electromotility, which is independent from basilar membrane traveling waves. After obtaining informed consent, volunteers with normal hearing (n = 10; mean age: 20.6 ± 1.2 years) and patients with unilateral deafness (n = 10; mean age: 30.2 ± 17.9 years) or bilateral deafness (n = 8; mean age: 30.7 ± 13.8 years) underwent a complete physical and audiological examination, and audiological tests including transient evoked otoacoustic emission and spontaneous otoacoustic emission (TEOAE and SOAE, respectively). SOAE recordings were performed during contralateral pure-tone stimuli at 1 and 3 kHz. SOAE recordings in the presence of contralateral pure-tone stimuli showed frequency-specific activation out of the initial frequency range of SOAE responses. Basilar membrane motion during pure-tone stimulation results from OHC activation by means of MOCE neurons rather than from a traveling wave. Eventually, frequency-specific responses obtained from SOAEs suggested that OHC electromotility may be responsible for frequency discrimination of the cochlea independently from basilar membrane motion.

Cochlear outer hair cell electromotility can provide force for both low and high intensity distortion product otoacoustic emissions

1998 ◽  
Vol 126 (1-2) ◽  
pp. 67-74 ◽  
Author(s):  
Gregory I Frolenkov ◽  
Inna A Belyantseva ◽  
Mauricio Kurc ◽  
Mary Ann Mastroianni ◽  
Bechara Kachar
Keyword(s):  
Hair Cell ◽  
High Intensity ◽  
Otoacoustic Emissions ◽  
Outer Hair Cell ◽  
Distortion Product Otoacoustic Emissions ◽  
Distortion Product

Comparison of distortion product otoacoustic emissions and pure tone audiometry in occupational screening for auditory deficit due to noise exposure

2015 ◽  
Vol 129 (12) ◽  
pp. 1174-1181 ◽  
Author(s):  
N Wooles ◽  
M Mulheran ◽  
P Bray ◽  
M Brewster ◽  
A R Banerjee
Keyword(s):  
Otoacoustic Emissions ◽  
Pure Tone ◽  
Noise Exposure ◽  
Outer Hair Cell ◽  
Cell Function ◽  
Pure Tone Audiometry ◽  
Otoacoustic Emission ◽  
Distortion Product Otoacoustic Emissions ◽  
Distortion Product Otoacoustic Emission ◽  
Distortion Product

AbstractObjective:To examine whether distortion product otoacoustic emissions can serve as a replacement for pure tone audiometry in longitudinal screening for occupational noise exposure related auditory deficit.Methods:A retrospective review was conducted of pure tone audiometry and distortion product otoacoustic emission data obtained sequentially during mandatory screening of brickyard workers (n = 16). Individual pure tone audiometry thresholds were compared with distortion product otoacoustic emission amplitudes, and a correlation of these measurements was conducted.Results:Pure tone audiometry threshold elevation was identified in 13 out of 16 workers. When distortion product otoacoustic emission amplitudes were compared with pure tone audiometry thresholds at matched frequencies, no evidence of a robust relationship was apparent. Seven out of 16 workers had substantial distortion product otoacoustic emissions with elevated pure tone audiometry thresholds.Conclusion:No clinically relevant predictive relationship between distortion product otoacoustic emission amplitude and pure tone audiometry threshold was apparent. These results do not support the replacement of pure tone audiometry with distortion product otoacoustic emissions in screening. Distortion product otoacoustic emissions at frequencies associated with elevated pure tone audiometry thresholds are evidence of intact outer hair cell function, suggesting that sites distinct from these contribute to auditory deficit following ototrauma.

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.

Sign in / Sign up

Export Citation Format

Share Document