Navegando por Palavras-chave "efferent pathways"

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    O papel do sistema olivococlear medial em crianças portadoras de TDAH
    (Associação Brasileira de Otorrinolaringologia e Cirurgia Cervicofacial, 2012-06-01) Pereira, Valéria Reis Do Canto; Feitosa, Maria Ângela Guimarães; Pereira, Luiz Henrique Mourão Do Canto; Azevedo, Marisa Frasson de [UNIFESP]; Universidade de Brasília Instituto de Psicologia Departamento de Processos Psicológicos Básicos; Ministério da Ciência e Tecnologia; Universidade Federal de São Paulo (UNIFESP)
    Attention deficit hyperactivity disorder (ADHD) patients show, as one of the main symptoms, an attentional impairment. Selective attention in the hearing process is the ability to understand speech in a noisy environment, which can be evaluated by several methods. One of the main approaches is the functioning of the Medial Olivocochlear Efferent System, which can be accessed by Transient-Evoked Otoacoustic Emissions (TOAE). OBJECTIVE:This study aimed at evaluating the suppression effect of contralateral noise on TOAE in ADHD (study group) and normal subjects (control group). Study Design: Case-control study. MATERIAL AND METHODS: A study with 20 children distributed in two, age- and gender-matched groups. RESULTS: No differences were found in TOAE responses between the two groups, with and without noise. CONCLUSIONS: We conclude that there were no functional differences in the Medial Olivocochlear Efferent System in the two groups analyzed.
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    Reconhecimento de fala em presença de ruído e suas relações com a supressão das emissões otoacústicas e o reflexo acústico
    (Associação Brasileira de Otorrinolaringologia e Cirurgia Cervicofacial, 2011-02-01) Lautenschlager, Larissa; Tochetto, Tania [UNIFESP]; Costa, Maristela Julio [UNIFESP]; Universidade Federal de São Paulo (UNIFESP); UFSM Departamento de Fonoaudiologia
    Subjects presenting difficulties in understanding speech with competing sounds may have absence of otoacoustic emission suppression and the acoustic reflex. AIM: To study the performance of the efferent auditory system in normal hearing subjects complaining of difficulties to understand speech in noise. MATERIAL AND METHODS: A prospective study comprising 50 normal-hearing subjects aged from 19 to 32 years, reporting difficulties with speech recognition in noise (with complaints - WC) or not (with no complaints - WNC). Distortion product evoked otoacoustic emissions (DPOAEs) were tested at frequencies from 1500 to 6000 Hz.The contralateral acoustic reflex (CAR) was investigated from 500 to 4000 Hz. RESULTS: Groups differed statistically as to the occurrence of CAR in the left ear at 4000 Hz. At 1500 Hz, there was a statistically significant effect - absence of DPOAEs in the WC group in the right ear. In left ears, absence of DPOAE suppression was higher in the WC at 1500 Hz and 2000 Hz. CONCLUSION: An association between self-reported difficulties in discriminating speech in noise and the absence of contralateral acoustic reflex at 4000 Hz in the left ear was observed; there was also absence of the suppression effect of DPOAEs, especially at middle frequencies in both ears.