Guinan J J, McCue M P
Hear Res. 1987;26(1):1-10. doi: 10.1016/0378-5955(87)90031-1.
Electromyographic activity (EMG) was used to monitor contractions of the stapedius muscle evoked by both ipsilateral and contralateral sound in ketamine-anesthetized or decerebrate cats. After the onset of a continuing tone, stapedius EMG often had bursts of activity at regular intervals; similar bursts were also observed in the EMG from the tensor tympani muscle. Plots of the r.m.s. amplitude of stapedius-EMG versus sound level usually had a steep rising phase (small dynamic range) and a plateau at high sound levels. For sound stimulation at 1 kHz, the crossed stapedius reflex had a lower maximum amplitude (ave. amplitude ratio: 0.37) and a higher threshold (ave. 8 dB) than the uncrossed reflex. Since the uncrossed reflex evokes considerably more stapedius EMG than does the crossed reflex, it probably produces correspondingly greater changes in middle-ear sound transmission.
在氯胺酮麻醉或去大脑的猫中，使用肌电图活动（EMG）来监测同侧和对侧声音诱发的镫骨肌收缩。在持续音调开始后，镫骨肌EMG常常以规则的间隔出现活动爆发；在鼓膜张肌的EMG中也观察到类似的爆发。镫骨肌EMG的均方根振幅与声级的关系图通常有一个陡峭的上升阶段（小动态范围）和在高声级时的平台期。对于1kHz的声音刺激，交叉镫骨肌反射的最大振幅较低（平均振幅比：0.37），阈值较高（平均8dB），比未交叉反射高。由于未交叉反射比交叉反射诱发的镫骨肌EMG多得多，它可能在中耳声音传输中产生相应更大 的变化。
