Repeatability of distortion product otoacoustic emissions in normally hearing humans.
Repeatability of distortion product otoacoustic emissions in normally hearing humans.
复制标题
正常听力人类失真产物耳声发射的可重复性。
作者：
J. Roede;F. Harris;R. Probst;L. Xu
在为期6周的4次测试中，对12名青年单耳或双耳的2f1-f2频率的失真产物耳声发射(DPOAEs)进行了测量。其目的是使用基于计算机的时间平均系统来确定重复测量中DPOAE幅度和“检测阈值”的变异性。用f1和f2相对于(F1f2)1/2以两种基本范式产生DPOAEs：(A)在0.8-8 kHz的刺激范围内，以0.2个八度间隔固定L1=L2为70和55dBSPL；(B)在0.8、1、1.5、2、3、4和6 kHz的刺激区中的输入-输出函数，L1从35-70dBSPL以5dBSPL的步长变化，L2在L1幅度下的6dBSPL变化。在等水平刺激下，L1=70dBSPL和L1=55dBSPL时，DPOAE波幅的平均变异分别为1.8dB(SD=1.8)和2.9dB(SD=2.7)。L1和L2在L1以下6分贝时分别为1.7分贝(SD=1.7)和2.4分贝(SD=2.0)。对于三分之一的受试者来说，在固定水平条件下，DPOAE的幅度变异性总体上最大，在6 kHz以上和1 khz以下，在2 khz范围内。无论是发射幅度的个体差异还是自发耳声发射的存在，都不会对耳朵内的幅度变异量产生显著影响。变异性不受测量间隔1至6周的时间长度的影响。
Distortion product otoacoustic emissions (DPOAEs) at the frequency of 2f1-f2 were measured in one or both ears of 12 young adults during 4 test sessions over a 6-week period. The purpose was to determine the variability in DPOAE amplitudes and 'detection thresholds' over repeated measurements using a computer-based time-averaging system. DPOAEs were generated with f1 and f2 relative to (f1f2)1/2 in two basic paradigms: (a) fixed levels of L1 = L2 of 70 and 55 dB SPL over a stimulus range from 0.8 to 8 kHz in 0.2-octave intervals; (b) input-output functions in stimulus regions of 0.8, 1, 1.5, 2, 3, 4 and 6 kHz, L1 from 35 to 70 dB SPL changing in 5-dB steps and L2 at 6 dB below the amplitude of L1. The mean variability of DPOAE amplitudes with equilevel stimuli was 1.8 dB (SD = 1.8) for L1 = 70 dB SPL and 2.9 dB (SD = 2.7) for L1 = 55 dB SPL. It was 1.7 dB (SD = 1.7) and 2.4 dB (SD = 2.0) for comparable levels of L1 with L2 at 6 dB below L1. Variability in amplitude of the DPOAEs for the fixed-level condition was greatest overall above 6 kHz and below 1 kHz and in the 2-kHz region for one third of the subjects. Neither individual differences in emission amplitudes nor the presence of spontaneous otoacoustic emissions had a significant influence on the amount of amplitude variability within ears. Variability was not influenced by the length of time between measurements from 1 to 6 weeks.(ABSTRACT TRUNCATED AT 250 WORDS)