Time Course of the Suppression Effect on Transient Evoked Otoacoustic Emissions by Prolonged Contralateral Acoustic Stimulation

This review addresses the putative role of the medial olivocochlear (MOC) reflex on psychophysical masking and intensity resolution in humans. A framework for interpreting psychophysical results in terms of the expected influenced of the MOC reflex is introduced. This framework is used to review the effects of a precursor or contralateral acoustic stimulation on 1) simultaneous masking of brief tones, 2) behavioral estimates of cochlear gain and frequency resolution in forward masking, 3) the build-up and decay of forward masking, and 4) measures of intensity resolution. Support, or lack thereof, for a role of the MOC reflex in psychophysical perception is discussed in terms of studies on estimates of MOC strength from otoacoustic emissions and the effects of resection of the olivocochlear bundle in patients with vestibular neurectomy. Novel, innovative approaches are needed to resolve the dissatisfying conclusion that current results are unable to definitively confirm or refute the role of the MOC reflex in masking and intensity resolution.

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Effects of Contralateral Acoustic Stimulation on Otoacoustic Emissions Following Vestibular Neurectomy

Scandinavian Audiology ◽

10.3109/01050399309047469 ◽

1993 ◽

Vol 22 (3) ◽

pp. 197-203 ◽

Cited By ~ 40

Author(s):

Eve A. Williams ◽

Gerald B. Brookes ◽

Deepak K. Prasher

Keyword(s):

Otoacoustic Emissions ◽

Acoustic Stimulation ◽

Vestibular Neurectomy ◽

Contralateral Acoustic Stimulation

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Influence of contralateral acoustic stimulation on distortion-product and spontaneous otoacoustic emissions in the barn owl

Hearing Research ◽

10.1016/s0378-5955(99)00126-4 ◽

1999 ◽

Vol 138 (1-2) ◽

pp. 1-12 ◽

Cited By ~ 12

Author(s):

Geoffrey A Manley ◽

Grit Taschenberger ◽

Horst Oeckinghaus

Keyword(s):

Otoacoustic Emissions ◽

Acoustic Stimulation ◽

Barn Owl ◽

Spontaneous Otoacoustic Emissions ◽

Distortion Product ◽

Contralateral Acoustic Stimulation

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Development of Auditory Asymmetry in Transient Evoked Otoacoustic Emissions in Pre-Term Infants

Journal of the American Academy of Audiology ◽

10.1055/s-0040-1715749 ◽

2003 ◽

Vol 14 (06) ◽

pp. 339-346

Author(s):

Thierry Morlet ◽

J. D. Durrant ◽

A. Lapillonne ◽

G. Putet ◽

L. Collet ◽

...

Keyword(s):

Otoacoustic Emissions ◽

Time Course ◽

Developmental Differences ◽

Study Cohort ◽

Cochlear Function ◽

Term Infants ◽

Transient Evoked Otoacoustic Emissions ◽

The Right ◽

Developmental Features ◽

Auditory Asymmetry

We previously reported that transient evoked otoacoustic emissions (TEOAEs) continue to develop after the onset of cochlear function in pre-term infants from 34 to 39 weeks of conceptional age (Morlet et al., 1996). The time-course of development differed between genders. Reported here are findings of further analysis of data from the study cohort, comprising 1020 ears of 510 pre-term neonates (conceptional age ranging from 34 to 39 weeks), demonstrating developmental differences between right and left ears. The left ear of female pre-term infants showed enhancement of TEOAE amplitude at low and medium frequencies with age, whereas differences were less dramatic in the right ear. In male infants, TEOAE amplitude decreased in several frequency bands at high frequencies, above 4 kHz, between 34 and 39 weeks conceptional age; most developmental differences were found to be more dramatic in the right than in the left ear. It is tempting to speculate that these developmental features underlie well-known inter-aural asymmetries that have been demonstrated in the adult human.

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Findings on the Central Auditory Functions of Endemic Disease Control Agents

International Journal of Environmental Research and Public Health ◽

10.3390/ijerph18137051 ◽

2021 ◽

Vol 18 (13) ◽

pp. 7051

Author(s):

Patrícia Arruda de Souza Alcarás ◽

Bianca Simone Zeigelboim ◽

Maria Cristina Alves Corazza ◽

Débora Lüders ◽

Jair Mendes Marques ◽

...

Keyword(s):

Disease Control ◽

Otoacoustic Emissions ◽

Noise Exposure ◽

Pesticide Exposure ◽

Exposed Group ◽

Occupational Noise ◽

Endemic Disease ◽

Transient Evoked Otoacoustic Emissions ◽

Suppression Effect ◽

Auditory Functions

This study aimed to assess the central auditory functions of endemic disease control agents. This cross-sectional cohort study comprised two groups: the exposed group, with 38 male endemic disease control agents with simultaneous occupational noise and pesticide exposure; and the control group, with 18 age- and sex-matched workers without occupational noise and/or pesticide exposure. All participants underwent pure-tone audiometry, brainstem auditory evoked potentials, dichotic digits test, and transient-evoked otoacoustic emissions suppression effect. There was a significant inter-group difference in waves III and V absolute latencies, and interpeak I–III and I–V latencies bilaterally, with worse results found in the exposed group. Abnormal dichotic digits test results occurred more often in the exposed group, with a significant association between pesticide- and noise-exposure and the abnormal results (p = 0.0099). The transient-evoked otoacoustic emissions with suppression effect did not yield significant inter-group differences. It was concluded that pesticide and noise exposure induce harmful effects on the central auditory functions, particularly on the brainstem and figure-ground speech-sound auditory skills.

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