Shaw N A
Department of Physiology, School of Medicine, University of Auckland, New Zealand.
Electromyogr Clin Neurophysiol. 1990 Apr-May;30(3):159-63.
The effects of low pass filtering on the brainstem auditory evoked potential (BAEP) were studied in the lightly anaesthetised rat. The high pass filter was kept fixed at 100 Hz in order to exclude the slow components on which the four fast waves of the BAEP are superimposed. The cut-off frequency of the low pass filter was systematically raised from 160 to 32 k HZ. With a band pass of 100-160 Hz, the BAEP waveform could barely be discerned. With a bandpass of 100-320 Hz, all four BAEP waves were apparent but of diminutive amplitude. With subsequent increases in the high frequency cut-off, the BAEP waveform became more clearly defined with increases in the amplitudes and decreases in the latencies of all four waves. However, beyond 8 k Hz, there was little additional change in waveform morphology. With widening of the bandpass, there was only a small concomitant decrease in brainstem transmission time. This implies that the effects of low pass filtering acted in a basically uniform manner on all four BAEP waves.
在轻度麻醉的大鼠中研究了低通滤波对脑干听觉诱发电位（BAEP）的影响。高通滤波器固定在100Hz，以排除BAEP四个快波所叠加的慢成分。低通滤波器的截止频率从160Hz系统地提高到32kHz。当带通为100 - 160Hz时，BAEP波形几乎无法辨别。当带通为100 - 320Hz时，所有四个BAEP波都很明显，但幅度较小。随着高频截止频率的后续增加，BAEP波形变得更加清晰，所有四个波的幅度增加且潜伏期缩短。然而，超过8kHz后，波形形态几乎没有额外变化。随着带通变宽，脑干传导时间仅伴随有小幅下降。这意味着低通滤波对所有四个BAEP波的作用基本均匀。
