Wilson R H, McBride L M
J Acoust Soc Am. 1978 Jan;63(1):147-54. doi: 10.1121/1.381706.
Measurements of the threshold and growth function of the acoustic reflex in man were made utilizing a signal-averaging technique. Pure tones (250, 500, 1000, 2000, and 4000 Hz) and broadband noise served as the contralateral stimuli delivered at intensity levels from the reflex threshold to 116 dB SPL. The acoustic conductance and susceptance components of admittance, at 220 and 660 Hz, were used to measure the reflex activity. The results are reported as changes in conductance, susceptance, and admittance in cgs mmho. The acoustic reflex thresholds were similar to those reported in other studies, with the 220-Hz probe yielding thresholds that averaged 3.5 dB higher than those obtained with the 660-Hz probe. Broadband noise and 1000-Hz stimuli produced the largest reflex magnitudes, while the smallest were observed with 250- and 4000-Hz signals. The dynamic ranges of the restricted growth functions were frequency dependent for pure tones and ranged from greater than 16 dB with 250 Hz to greater than 28 dB with 1000 Hz, while that for noise was greater than 50 dB. The first derivative of the best-fit third-degree polynomial was used to describe the slope characteristics of the growth functions, in which frequency and intensity effects were found. Relationships between the acoustic reflex and tympanometry were observed and are also discussed.
利用信号平均技术对人体听觉反射的阈值和增长函数进行了测量。纯音（250、500、1000、2000和4000赫兹）和宽带噪声用作对侧刺激，强度水平从反射阈值到116分贝声压级。在220和660赫兹时，导纳的声导和电纳分量用于测量反射活动。结果以厘克毫姆（cgs mmho）为单位报告为电导、电纳和导纳的变化。听觉反射阈值与其他研究报告的相似，220赫兹探头产生的阈值平均比660赫兹探头获得的阈值高3.5分贝。宽带噪声和1000赫兹刺激产生的反射幅度最大，而250赫兹和4000赫兹信号产生的反射幅度最小。受限增长函数的动态范围在纯音情况下与频率有关，范围从250赫兹时大于16分贝到1000赫兹时大于28分贝，而噪声的动态范围大于50分贝。最佳拟合三次多项式的一阶导数用于描述增长函数的斜率特征，从中发现了频率和强度效应。观察并讨论了听觉反射与鼓室图之间的关系。
