Reduced Medial Olivocochlear Bundle System Function in Children with Auditory Processing Disorders

Muchnik, Chava; Roth, Daphne Ari‐Even; Othman-Jebara, R; Putter-Katz, Hanna; Shabtai, Esther; Hildesheimer, Minka

doi:10.1159/000076001

Cited by 101 publications

(143 citation statements)

References 28 publications

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“…As subjects with altered auditory processing have difficulties in dichotic conditions, dominance of left ear suppression relative to the right ear may represent a non-existence of left hemisphere dominance. 11,18 There was no statistically significant gender difference in all suppression conditions in this study. However, control group males had higher mean TOAE suppression values than females.…”

Section: Discussion About the Results Of Toae Suppressioncontrasting

confidence: 47%

“…However, suppression values in the control group were higher compared to the study group, which suggests a decreased inhibitory effect of the efferent auditory system in children with auditory processing disorders; this findings has been reported in other studies. 11,18 Hearing, however, is a complex mechanism involving many peripheral (such as the ear) and central (such as the auditory cortex) anatomical structures. Each one of these has a specific and determinant role in hearing.…”

Section: Discussion About the Results Of Toae Suppressionmentioning

confidence: 99%

“…Studies on suppression have shown that this group of patients has decreased or absent OAE suppression, suggesting that the inhibitory effect of the efferent system is decreased. 11,12 The year 2000 Consensus Conference on the Diagnosis of Auditory Processing Disorders in School-aged Children reaffirmed the indication of electroacoustic procedures (OAE and immitance testing), as well as behavioral and electrophysiological test, to increase precision in the diagnosis of auditory processing disorders. 13 Use of these procedures for assessment purposes may help advance knowledge about the efferent function in children with altered processing of hearing as characterized by loss of figure-background abilities and auditory closure.…”

Section: Introductionmentioning

confidence: 99%

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Sistema auditivo eferente: efeito no processamento auditivo

Burguetti¹,

Carvallo

2008

Rev. Bras. Otorrinolaringol.

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O processamento da informação sonora depende da integridade das vias auditivas aferentes e eferentes. O sistema auditivo eferente pode ser avaliado por meio dos reflexos acústicos e da supressão das emissões otoacústicas. OBJETIVO: Verificar a atividade do sistema auditivo eferente, por meio da supressão das emissões otoacústicas (EOA) e da sensibilização do reflexo acústico no distúrbio de processamento auditivo. CASUÍSTICA E MÉTODO: Estudo prospectivo: 50 crianças com alteração de processamento auditivo (grupo estudo) e 38 sem esta alteração (grupo controle), avaliadas por meio das EOA na ausência e presença de ruído contralateral e da pesquisa dos limiares do reflexo acústico na ausência e presença de estímulo facilitador contralateral. RESULTADOS: O valor médio da supressão das EOA foi de até 1,50 dB para o grupo controle e de até 1,26 dB para o grupo estudo. O valor médio da sensibilização dos reflexos foi de até 14,60 dB para o grupo estudo e de até 15,21 dB para o grupo controle. Não houve diferença estatisticamente significante entre as respostas dos grupos controle e estudo em ambos os procedimentos. CONCLUSÃO: O grupo estudo apresentou valores reduzidos na supressão das EOA e valores aumentados na sensibilização do reflexo acústico, em relação ao grupo controle.

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Section: Discussion About the Results Of Toae Suppressioncontrasting

confidence: 47%

Section: Discussion About the Results Of Toae Suppressionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Sistema auditivo eferente: efeito no processamento auditivo

Burguetti¹,

Carvallo

2008

Rev. Bras. Otorrinolaringol.

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“…The frequently observed deterioration of symptoms in APD children in noisy surroundings (ASHA 1996(ASHA , 2005 could point towards a reduced function of the MOCB in this patient group. Actually, not only reduced OAE suppression effects but also generally larger amplitudes of OAE were found in APD children suggesting an impaired function of the efferent central auditory system (Muchnik et al 2004;Moore 2006). The presently measured elevated thresholds in the dichotic s/n condition could-at least in part-result from impaired function of the MOCB.…”

Section: Discrimination Deficits and Possible Top-down Engagementmentioning

confidence: 68%

Auditory Processing Disorders with and without Central Auditory Discrimination Deficits

Ludwig

Fuchs

Kruse

et al. 2014

JARO

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Auditory processing disorder (APD) is defined as a processing deficit in the auditory modality and spans multiple processes. To date, APD diagnosis is mostly based on the utilization of speech material. Adequate nonspeech tests that allow differentiation between an actual central hearing disorder and related disorders such as specific language impairments are still not adequately available. In the present study, 84 children between 6 and 17 years of age (clinical group), referred to three audiological centers for APD diagnosis, were evaluated with standard audiological tests and additional auditory discrimination tests. Latter tests assessed the processing of basic acoustic features at two different stages of the ascending central auditory system: (1) auditory brainstem processing was evaluated by quantifying interaural frequency, level, and signal duration discrimination (interaural tests). (2) Diencephalic/telencephalic processing was assessed by varying the same acoustic parameters (plus signals with sinusoidal amplitude modulation), but presenting the test signals in conjunction with noise pulses to the contralateral ear (dichotic signal/ noise tests). Data of children in the clinical group were referenced to normative data obtained from more than 300 normally developing healthy school children. The results in the audiological and the discrimination tests diverged widely. Of the 39 children that were diagnosed with APD in the audiological clinic, 30 had deficits in auditory performance. Even more alarming was the fact that of the 45 children with a negative APD diagnosis, 32 showed clear signs of a central hearing deficit. Based on these results, we suggest revising current diagnostic procedure to evaluate APD in order to more clearly differentiate between central auditory processing deficits and higher-order (cognitive and/or language) processing deficits.

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“…In children, this difficulty can be manifested by behavioral alterations, and it can influence the learning process (13) . Individuals with auditory processing disorders have decreased or absence of otoacoustic emissions suppression, which suggests reduced inhibitory effect of the MOCS (14,15) . Children with phonological disorders can present auditory processing deficits, and the ability to figure-ground is usually the most affected (16) .…”

Section: Introductionmentioning

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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Reduced Medial Olivocochlear Bundle System Function in Children with Auditory Processing Disorders

Cited by 101 publications

References 28 publications

Sistema auditivo eferente: efeito no processamento auditivo

Sistema auditivo eferente: efeito no processamento auditivo

Auditory Processing Disorders with and without Central Auditory Discrimination Deficits

Função do sistema olivococlear medial em crianças com desvio fonológico

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