鼓膜电极引起的行为纯音阈值偏移
Behavioral Pure-Tone Threshold Shifts Caused by Tympanic Membrane Electrodes.
作者信息
Smith Spencer B, Lichtenhan Jeffery, Cone Barbara
机构信息
1Department of Speech, Language, and Hearing Sciences, University of Arizona, Tucson, Arizona, USA; and 2Department of Otolaryngology, Washington University in St. Louis School of Medicine, St. Louis, Missouri, USA.
出版信息
Ear Hear. 2016 Jul-Aug;37(4):e273-5. doi: 10.1097/AUD.0000000000000275.
OBJECTIVE
To determine whether tympanic membrane (TM) electrodes induce behavioral pure-tone threshold shifts.
DESIGN
Pure-tone thresholds (250 to 8000 Hz) were measured twice in test (n = 18) and control (n = 10) groups. TM electrodes were placed between first and second threshold measurements in the test group, whereas the control group did not receive electrodes. Pure-tone threshold shifts were compared between groups. The effect of TM electrode contact location on threshold shifts was evaluated in the test group.
RESULTS
TM electrodes significantly increased average low-frequency thresholds, 7.5 dB at 250 Hz and 4.2 dB at 500 Hz, and shifts were as large as 25 dB in individual ears. Also, threshold shifts did not appear to vary at any frequency with TM electrode contact location.
CONCLUSIONS
Low-frequency threshold shifts occur when using TM electrodes and insert earphones. These findings are relevant to interpreting electrocochleographic responses to low-frequency stimuli.
目的
确定鼓膜（TM）电极是否会引起行为纯音阈值偏移。
设计
在测试组（n = 18）和对照组（n = 10）中对纯音阈值（250至8000 Hz）进行了两次测量。在测试组中，TM电极放置在第一次和第二次阈值测量之间，而对照组未接受电极。比较了两组之间的纯音阈值偏移。在测试组中评估了TM电极接触位置对阈值偏移的影响。
结果
TM电极显著提高了平均低频阈值，250 Hz时提高了7.5 dB，500 Hz时提高了4.2 dB，个别耳朵的偏移高达25 dB。此外，阈值偏移在任何频率下似乎都不会随TM电极接触位置而变化。
结论
使用TM电极和插入式耳机时会出现低频阈值偏移。这些发现与解释对低频刺激的耳蜗电图反应有关。
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