Wilson R H, Shanks J E, Velde T M
J Speech Hear Disord. 1981 Nov;46(4):413-21. doi: 10.1044/jshd.4604.413.
Bilateral measurements of the aural acoustic-immittance characteristics of the middle-ear transmission system of 48 subjects were made with an acoustic-admittance meter. The measurements, including static acoustic-immittance, acoustic-reflex thresholds, and acoustic-reflex growth functions, were made using a 220-Hz probe. The contralateral reflex data for three pure tones (500, 1000, and 2000 Hz) and for broadband noise were acquired in 2-dB steps at sound-pressure levels from 84-116 dB (tones) and 66-116 dB (noise) during ascending- and descending-intensity level runs. For all acoustic-immittance measurements, right ear and left ear comparisons were made and found not to be significantly different. The individual subject data then were expressed as the absolute differences between ears. In this manner normative inter-aural immittance differences were defined. The peak static immittance data were analyzed in terms of median inter-aural differences and upper 80% cut-off values. The 80% ranges for normal immittance values were smaller for a within subject versus an across subject comparison. For acoustic-reflex thresholds, a disparity between ears of greater than 10 dB was suggested as indicative of an abnormality in the auditory mechanism. Finally, the reflex-growth data indicated mean inter-aural absolute differences that ranged to .040-.043 acoustic mmhos (300-400 acoustic ohms) at the higher reflex activator sound-pressure levels.
使用声导抗仪对48名受试者中耳传导系统的耳声导抗特性进行了双侧测量。测量包括静态声导抗、声反射阈值和声反射增长函数，使用220赫兹探头进行。在强度上升和下降过程中，以2分贝的步长获取了三个纯音（500、1000和2000赫兹）和宽带噪声的对侧反射数据，声压级范围为84 - 116分贝（纯音）和66 - 116分贝（噪声）。对于所有声导抗测量，对右耳和左耳进行了比较，发现无显著差异。然后将个体受试者的数据表示为双耳之间的绝对差异。通过这种方式定义了标准的耳间导抗差异。根据耳间差异中位数和上80%截止值对峰值静态导抗数据进行了分析。与跨受试者比较相比，同一受试者内正常导抗值的80%范围更小。对于声反射阈值，双耳之间大于10分贝的差异被认为表明听觉机制存在异常。最后，反射增长数据表明，在较高的反射激活声压级下，耳间平均绝对差异范围为0.040 - 0.043声毫姆欧（300 - 400声欧姆）。
