Suppression of Otoacoustic Emissions Evoked by White Noise and Speech Stimuli

Abstract

Introduction: Suppressing otoacoustic emissions is one of the objectives, noninvasive methods that can be used to assess the eferent auditory system. When the ascending reticular activating system is stimulated, the cortex becomes more alert. The system reacts beter to an important stimulus than an unimportant one.Objective: Assess the efect of suppressing otoacoustic emissions by transitory stimulus in the presence of diferent auditory stimuli in normal listeners. Methods:This cross-sectional, observational analytical study. The sample was composed of eight participants. The following procedures were adopted: recording otoacoustic emissions, suppression with white noise, suppression with white noise and pure tone, auditory training, new recording of suppression with white noise and pure tone, suppression using a speech patern, suppression using a reversed speech patern, suppression using familiar speech, and suppression using reversed familiar speech and suppression singing "happy birthday" in a familiar voice.Results: There was a signiicant diference between the otoacoustic emission values, mainly at frequencies of 1000 and 1500 Hz. Conclusion:Individuals submited to the efects of suppression exhibit more efective results at frequencies of 1000 and 1500 Hz. Furthermore, it was found that the eferent activity of the auditory system is more eicient when it involves the use of the speech spectrum.

Efeitos da exposição a produtos químicos ou ao ruído sobre a audição

“…(Rosati et al, 2017;Nadon et al, 2017). Ressalta-se, no entanto, que assim como para os limiares auditivos, as variáveis como idade e sexo podem influenciar nos resultados (Rosati et al, 2017) Retomando-se o conceito da possível proteção auditiva fornecida pelo arcabouço hormonal feminino relativo ao estrogênio (Meltser et al, 2008, Charitidi et al, 2010 (Andrade et al, 2017).…”