Youngblood J, Martin F N
J Aud Res. 1981 Jan;21(1):45-9.
The auditory masked threshold of a 1-kc/s pure tone was determined in quiet and with levels of white noise at 50-80 db SL in the non-test ear. Two groups of normal-hearing adults were tested, one (N:14, mn age = 27.4 yrs) with no history of middle-ear pathology, and another (N:12, mn age = 44.7 yrs) with the stapedial tendon severed. Significant differences in the amount of masked-threshold shift were observed, greater shifts being seen for the normal Ss, additional shifts ranging from 0.8-4.3 db as masking increased from 50-80 db SL. These differences were judged to be at least partly the result of stapedial contraction rather than having their origin entirely in central masking as often assumed.
在安静环境以及非测试耳中白噪声水平为50 - 80分贝感觉级（dB SL）的条件下，测定了1000赫兹纯音的听觉掩蔽阈值。对两组听力正常的成年人进行了测试，一组（N = 14，平均年龄 = 27.4岁）无中耳病理史，另一组（N = 12，平均年龄 = 44.7岁）镫骨肌腱已切断。观察到掩蔽阈值偏移量存在显著差异，正常受试者的偏移量更大，随着掩蔽从50 - 80分贝感觉级增加，额外偏移范围为0.8 - 4.3分贝。这些差异被判定至少部分是镫骨收缩的结果，而并非如通常所认为的完全源于中枢掩蔽。
