聴力正常者の誘発耳音響放射に関する検討

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  • Stimulated oto-acoustic emission in normal hearing subjects.

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Stimulated oto-acoustic emission (OAE) was investigated in 17 normal hearing subjects (male: 9, female: 8). OAE was recorded in 93.9% of total ears. Most clear responses against 45dBnHL stimulation existed between 1.0kHz and 2.0kHz. Their maximum responses were between 1.4kHz and 1.8kHz. Pseudothreshold of OAE showed relatively wide intersubject variations and existed between - 5dB and 40dB. However, the interaural difference of pseudothreshold was small and in 86.7% of total ears it was less than 10dB. The input-output function of 17 ears was nonlinear and the mean value of pseudothreshold was 12.7dB. The input-output function of 14 ears was nearly linear and the mean value of pseudothreshold was 30.0dB. The near linear input-output function of the latter could be caused by mixing in resonance of the prove tube and the external and middle ear cavities against intense sound applications. The interaural difference of pseudothreshold in OAE can be instrumental in examining cochlear functions.

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