pure tone threshold practise
3.Auditory brain stem response(ABR)threshole and pure tone threshold were measured for 22 ears. The results showed that the difference between two methods was 50% within 10 dB A. Correlative analysis indicated that the language frequency threshold and high frequency were correlated with ABR threshold.
5.These subjects accepted various combinative auditory tests with pure tone threshold audiometry (PTA), acoustic impedance audiometry, 40 Hertz Auditory Event-related Potential(40 Hz AERP), Auditory brainstem response test (ABR), Auditory mulit-frequency steady-state responses(ASSR), Distortion product otoacoustic emissions(DPOAEs).
10.The most important audiological characteristic of AN patients is that auditory brainstem responses (ABR) are absent or abnormal severely, but evoked otoacoustic emissions (EOAE) are normally recorded, and the speech hearing is worse obviously than the pure tone hearing, and the audiogram is bilateral ascending curve mostly, and pure tone auditory threshold is higher obviously at low frequencies, and acoustic stapedius reflex is absent and the contralateral suppression effect of distortion product otoacoustic emissions(DPOAE) is disappeared.
