摘要
为确定听力正常人的瞬态耳声发射基本特征,了解不同刺激强度对瞬态耳声发射的平均振幅和频谱的影响,以作为与听力异常的人群进行对照的标准.利用地—88耳动态分析仪对听力正常的25耳进行测试,分别记录用70、76、82 dB SPL三种刺激声刺激时的瞬态耳声发射的平均振幅和频谱,三种刺激声强度下,瞬态耳声发射的平均振幅分别为5.97、9.22、12.76 dB SPL,增长率分别为54.4%、39.4O,频谱的频率分布于0.4～6kHz范围内,以4kHz以下为主,其峰值位于1025、1513Hz处,以 P_95为指标,在刺激声强度低于82 dB SPL时,瞬态耳声发射的频谱中各频率点的强度有不同程度的升高,由于听力正常人的频谱具有相对不连续性的高频下降趋势,与正常人纯音听阈并不完全对应,故不能单纯根据瞬态耳声发射的频谱对纯音听阈进行评估,而要综合考虑.
Transient Evoked otoacoustic emissions(TEOAE) in 25 hearing- normal youngers was analysed to study its basic character and the influences of different stimulus intensities on the amplitude and the power spectrum which may be useful to identify the hearing-loss subjects as the standardline. We find that the average amplitude of TEOAE is 5.97, 9.22, 12. 76 dB SPL under three intensities,the frequencies of the spectrum distribute from 0 to 6 000 Hz. The two maximal values are located in 1 025 Hz and 1 513 Hz seper-ately. The amplitude of TEOAE increases with the stimulus tone's growth. We conclude that it's necessary to consider completely when evaluating the patient's hearing function by TEOAE's power spectrum on account of its incontinuity and decrease in high frequency.
出处
《听力学及言语疾病杂志》
CAS
CSCD
1998年第3期132-135,共4页
Journal of Audiology and Speech Pathology
