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Turkish Archives of Otolaryngology 2001; 39(2): 96-101 Abstract |
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The
Influences of Contralateral Acoustic Stimulation on Spontaneous
Otoacoustic Emissions
Kontralateral Akustik
Uyarının Spontan Otoakustik Emisyonlar Üzerine Etkileri |
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| Taksim Training and Research Hospital, ENT Clinic, İstanbul, Turkey |
| Key Words |
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| Spontaneous otoacoustic emissions, efferent innervation, contralateral stimulation |
| Abstract |
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Objective:
To investigate the influences of contralateral acoustic stimulation on
amplitudes and frequencies of spontaneous otoacoustic emissions (SPOAEs).
Materials and Methods: Twenty voluntary partpicians with normal hearing and unilateral SPOAE were included in the study. Emissions were recorded before and during stimulation of contralateral ear with 75 dB SPL white-noise. Results: From 20 cases, thirty SPOAEs with amplitudes ranging between -6 to 19 dB SPL (mean: 6.3 dB SPL) and with a mean frequency of 1925 Hz were recorded. During contralateral stimulation, the mean amplitude and frequency of SPOAEs were found to be 3.6 dB SPL and 2004 Hz respectively. The suppressive effect of contralateral noise on SPOAEs were present at all frequencies with a higher significance in 1 to 3 kHz frequency range. In all SPOAE frequencies, an upward shift was noted during contralateral acoustic stimulation.. Conclusion: Acoustical stimulation of efferent innervation the cochlea causes alterations in its active micro-mechanics and therefore in amplitudes and frequencies of SPOAEs with a frequency selective manner. |
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| Accepted after revision: November 20, 2000 | |||
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Correspondence: |
Çağatay Oysu, MD Hacı Hakkı Bey Sok. Başel Apt. 4/7 Erenköy 81070 İstanbul - Türkiye, Phone: (0216) 424 35 27, Fax: (0212) 244 55 41 e-mail: coysu@doruk.net.tr
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Türk Otolarengoloji Arşivi / Turkish Archives of Otolaryngology |
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Copyright © 2002-2005 by the Turkish Otolaryngology & Head and Neck Surgery Foundation. |
