The Effect of Contralateral Acoustic Stimulation on Spontaneous Otoacoustic Emissions

Zhao, Wei; Dhar, Sumitrajit

doi:10.1007/s10162-009-0189-4

Cited by 55 publications

(56 citation statements)

References 68 publications

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“…For clarity, changes in SOAE frequency and level with CAS are shown in panel C. Ear canal spectra in quiet and CAS for one subject are also shown in panel A, demonstrating the typical CAS-mediated reduction in SOAE amplitude and upward shift in SOAE frequency. These changes were representative of the effects observed on the total population of SOAEs from which the selected SOAEs were taken and are consistent with previous reports of the effects of CAS on SOAEs Harrison and Burns 1993;Zhao and Dhar 2010, 2011.…”

Section: Soae-specific Measurementssupporting

confidence: 89%

“…This shift was anticipated based on previously observed effects of CAS on SOAEs Harrison and Burns 1993;Zhao and Dhar 2010, 2011 and the close frequency correspondence between threshold minima and SOAEs (e.g., Wilson 1980;Schloth 1983;Zwicker and Schloth 1984). We confirmed that threshold minima occurred very near in frequency to each selected SOAE, with frequency discrepancies typically less than a few Hz (or 0.1 %), both in quiet and with CAS.…”

Section: Frequency Shifts In Threshold Minima and Soaessupporting

confidence: 87%

“…Thus, during each test session, absence of significant MEMR in response to the 60-dB SPL CAS was verified using a procedure described in Zhao and Dhar (2010) and Deeter et al (2009). Briefly, a 602-Hz, 60-dB SPL probe tone was presented to the test ear for 4 s, with a 500-ms burst of CAS presented after the first second.…”

Section: Middle Ear Muscle Reflex Testmentioning

confidence: 99%

“…While MOC modulation of OAEs evoked by clicks or tones is typically quite small, with amplitude reductions on the order of a few decibels or less, more pronounced effects are observed for spontaneous OAEs (SOAEs), narrowband cochlear signals measured in the absence of an evoking stimulus. Activation of the MOC system via contralateral acoustic stimulation (CAS) reduces SOAE amplitudes by as much as 15 dB and produces small upward shifts in SOAE frequencies Harrison and Burns 1993;Zhao and Dhar 2010). SOAE frequency shifts may be related to the phase leads observed in evoked OAEs (Francis and Guinan 2010) and in direct measurements of basilar membrane motion (Cooper and Guinan 2003) with MOC activation.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Contralateral Acoustic Stimulation on Spontaneous Otoacoustic Emissions and Hearing Threshold Fine Structure

Dewey

Lee

Dhar

2014

JARO

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Medial olivocochlear (MOC) influence on cochlear mechanics can be noninvasively, albeit indirectly, explored via the effects of contralateral acoustic stimulation (CAS) on otoacoustic emissions. CASmediated effects are particularly pronounced for spontaneous otoacoustic emissions (SOAEs), which are typically reduced in amplitude and shifted upward in frequency by CAS. We investigated whether similar frequency shifts and magnitude reductions were observed behaviorally in the fine structure of puretone hearing thresholds, a phenomenon thought to share a common underlying mechanism with SOAEs. In normal-hearing listeners, fine-resolution thresholds were obtained over a narrow frequency range centered on the frequency of an SOAE, both in the absence and presence of 60-dB SPL broadband CAS. While CAS shifted threshold fine structure patterns and SOAEs upward in frequency by a comparable amount, little reduction in the presence or depth of fine structure was observed at frequencies near those of SOAEs. In fact, CAS typically improved thresholds, particularly at threshold minima, and increased fine structure depth when reductions in the amplitude of the associated SOAE were less than 10 dB. Additional measurements made at frequencies distant from SOAEs, or near SOAEs that were more dramatically reduced in amplitude by the CAS, revealed that CAS tended to elevate thresholds and reduce threshold fine structure depth. The results suggest that threshold fine structure is sensitive to MOC-mediated changes in cochlear gain, but that SOAEs complicate the interpretation of threshold measurements at nearby frequencies, perhaps due to masking or other interference effects. Both threshold fine structure and SOAEs may be significant sources of intersubject and intrasubject variability in psychoacoustic investigations of MOC function.

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Section: Soae-specific Measurementssupporting

confidence: 89%

Section: Frequency Shifts In Threshold Minima and Soaessupporting

confidence: 87%

Section: Middle Ear Muscle Reflex Testmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of Contralateral Acoustic Stimulation on Spontaneous Otoacoustic Emissions and Hearing Threshold Fine Structure

Dewey

Lee

Dhar

2014

JARO

Self Cite

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“…This finding disagrees with studies that indicate that children with auditory processing disorders have a decreased level or absence of suppression of otoacoustic emissions (14)(15)18) . Moreover, other findings assume that the figure-ground ability is directly related to the MOCS reflex, that is, the higher this ability, the greater the suppression of OAE (28,29) . The figure-ground ability is the one that seems to be more affected in subjects with phonological disorders, which disagrees with previous findings (16) .…”

Section: Discussionmentioning

confidence: 99%

Função do sistema olivococlear medial em crianças com desvio fonológico

Didoné

Kunst

Weich

et al. 2011

J. Soc. Bras. Fonoaudiol.

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OBJETIVO: Verificar se crianças com desvio fonológico apresentam alterações do sistema olivococlear medial. MÉTODOS: Trata-se de estudo prospectivo e transversal. Foram avaliadas 19 crianças normo-ouvintes, de ambos os gêneros, com idades entre 4 e 7 anos, que foram divididas em dois grupos: 11 crianças sem desvio fonológico (grupo controle) e oito com desvio fonológico (grupo estudo). A condição auditiva foi verificada por meio da inspeção visual do meato acústico externo, audiometria tonal liminar e imitanciometria. Foram incluídas em ambos os grupos somente as crianças com limiares tonais iguais ou inferiores a 15 dB, timpanometria tipo A e reflexos acústicos presentes. Para avaliar a função do sistema olivococlear medial procedeu-se à avaliação das emissões otoacústicas evocadas transientes (EOAET) com e sem aplicação de ruído branco na intensidade de 60 dBNA contralateralmente. Os dados foram analisados estatisticamente. RESULTADOS: A ocorrência e a média dos valores de supressão das EOAET das orelhas direita e esquerda não apresentaram diferenças nas frequências de 1, 2, 3 e 4 kHz intragrupos estudo e controle. Na comparação da média e ocorrência do efeito supressor das emissões otoacústicas evocadas transientes entre grupo controle e grupo estudo, também não houve diferenças nas frequências analisadas. CONCLUSÃO: Crianças com desvio fonológico não apresentam alterações do sistema olivococlear medial, aspecto evidenciado pela ocorrência do efeito supressor das emissões otoacústicas evocadas transientes.

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Responses of the Human Inner Ear to Low-Frequency Sound

Drexl

Krause

Gürkov

et al. 2016

Advances in Experimental Medicine and Biology

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The perceptual insensitivity to low frequency (LF) sound in humans has led to an underestimation of the physiological impact of LF exposure on the inner ear. It is known, however, that intense, LF sound causes cyclic changes of indicators of inner ear function after LF stimulus offset, for which the term "Bounce" phenomenon has been coined.Here, we show that the mechanical amplification of hair cells (OHCs) is significantly affected after the presentation of LF sound. First, we show the Bounce phenomenon in slow level changes of quadratic, but not cubic, distortion product otoacoustic emissions (DPOAEs). Second, Bouncing in response to LF sound is seen in slow, oscillating frequency and correlated level changes of spontaneous otoacoustic emissions (SOAEs). Surprisingly, LF sound can induce new SOAEs which can persist for tens of seconds. Further, we show that the Bounce persists under free-field conditions, i.e. without an in-ear probe occluding the auditory meatus. Finally, we show that the Bounce is affected by contralateral acoustic stimulation synchronised to the ipsilateral LF sound. These findings clearly demonstrate that the origin of the Bounce lies in the modulation of cochlear amplifier gain. We conclude that activity changes of OHCs are the source of the Bounce, most likely caused by a temporary disturbance of OHC calcium homeostasis. In the light of these findings, the effects of long-duration, anthropogenic LF sound on the human inner ear require further research.

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The Effect of Contralateral Acoustic Stimulation on Spontaneous Otoacoustic Emissions

Cited by 55 publications

References 68 publications

Effects of Contralateral Acoustic Stimulation on Spontaneous Otoacoustic Emissions and Hearing Threshold Fine Structure

Effects of Contralateral Acoustic Stimulation on Spontaneous Otoacoustic Emissions and Hearing Threshold Fine Structure

Função do sistema olivococlear medial em crianças com desvio fonológico

Responses of the Human Inner Ear to Low-Frequency Sound

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