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Indexed/Abstracted in: EMBASE, Scopus
Online ISSN 1827-188X
Neglia C. B., Arisi E., Schindler A. *, Ottaviani F. **
From the Dipartimento di Scienze Otorinolaringologiche Università degli Studi - Milano Ospedale Maggiore IRCCS - Milano
*Istituto Auxologico Italiano IRCCS - Milano
**Divisione di Otorinolaringoiatria Azienda Ospedaliera Polo Universitario San Paolo - Milano
Background. Contralateral suppression of transient evoked oto-acoustic emissions (TEOAEs) consists of the decrease of TEOAEs intensity, during the contralateral ear’s simultaneous stimulation with white noise. Physiological meaning of this mechanism has not been entirely understood so far. Aim of the study was, to investigate contralateral inhibition during hearing attention.
Methods. TEOAEs were recorded in 32 normal-hearing subjects in the absence of inhibitory stimulus, during contralateral 40 dB SPLpe white-noise stimulation and during contralateral 40 dB SPLpe speech stimulation.
Results. Response intensity of TEOAEs during white noise stimulation and during speech stimulation proved significantly lower than basal TEOAEs intensity Similarly TEOAEs reproducibility during white noise stimulation and during speech stimulation proved significantly lower than basal TEOAEs reproducibility. A statistically significant difference was found between TEOAEs reproducibility during white noise and during speech stimulation. TEOAEs intensity during white noise stimulation and during speech stimulation, proved significantly lower compared to basal records at each of the FFT analyzed frequencies, with the exception of 4 KHz. A statistically significant difference was found between white noise and speech stimulation intensity at 1 kHz.
Conclusions. In conclusion, the results of the present work show that contralateral suppression of TEOAEs during speech stimulation is greater than during white noise stimulation at the middle frequencies, suggesting a role of selective hearing attention in cochlear physiology.