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Brazilian Journal of Otorhinolaryngology

Print version ISSN 1808-8694

Abstract

LAUTENSCHLAGER, Larissa; TOCHETTO, Tania  and  COSTA, Maristela Julio. Recognition of speech in noise and relations with suppression of otoacoustic emissions and the acoustic reflex. Braz. j. otorhinolaryngol. (Impr.) [online]. 2011, vol.77, n.1, pp.115-120. ISSN 1808-8694.  https://doi.org/10.1590/S1808-86942011000100019.

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.

Keywords : adult; efferent pathways; reflex acoustic; hearing tests; acoustic.

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