这对电极测的是大脑上两点间的电位差。
The pair of electrodes measures the difference in electrical potential (voltage) between their two positions above the brain.
不同位置发生放电时，可利用同一测量点所测信号根据其幅频特性的不同来确定放电位置。
When the discharge occurs at different position, the discharge position can be located by the difference of amplitude-frequency characteristic of the signal measured at the same point.
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