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人脑神经的电活动,也发生磁场反应。通过高灵敏度磁力计测得的图象就是脑磁图。听觉诱发反应由杂音或纯音诱发的脑磁图,按刺激反应潜伏时间的长短分为:10毫秒的听性脑干反应,中间潜时反应和50毫秒以上的皮质性长潜时反应三种。听性脑干反应在诱发脑磁图上磁场水平最低,测定也难。随着SQUID技术进步,仪器将能测出地磁一亿分之一的信号。因此脑磁图不仅可以做信号定位,而且对脑干内听觉信号传递和处理研究方面,也会有新的发现。长潜时反应的信号水平,高出1～2个档次,它的发生源可能在第一听觉区附近。磁场在头皮上的分布,发生源可以看作是一个电流双极子,因此通过简单计算,就能够求出它的位置、大小和电流方向。测定断续纯音长潜时反应发生源位置的结果证
Electrical activity of human brain, magnetic field reaction also occurs. The image measured by a high-sensitivity magnetometer is the magnetoencephalography. Auditory evoked response induced by murmur or pure tone magnetoencephalography, according to the length of the latency response stimulus is divided into: 10 milliseconds of auditory brainstem response, the intermediate latency reaction and 50 milliseconds or longer cortical latency reaction of three. Auditory brainstem response induced magnetic field in the magnetic field on the lowest level, the determination is also difficult. As SQUID technology advances, the instrument will be able to detect a one-billionth geomagnetic signal. Therefore, magnetoencephalography can not only do signal localization, but also on the brain stem auditory signal transmission and processing research, there will be new discoveries. Long latency response signal level, higher than 1 to 2 grades, its source may be in the vicinity of the first auditory zone. The distribution of the magnetic field on the scalp, the source can be seen as a current bipolar, so through a simple calculation, we can find its location, size and current direction. Determination of intermittent pure tone long latency reaction source location results certificate