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脑神经细胞群兴奋的离子电流在头皮外产生微弱的磁场。测量这种磁场的技术方法称为脑磁图(MEG)。采用超量子干涉元件(Superconductingquantum interference device:SQUID)制作的超高感度磁力计,可测出为地磁的一亿分之一的极微弱的
Excited ion currents in the brain nerve cell population generate a weak magnetic field outside the scalp. The technical method of measuring this magnetic field is called magnetoencephalography (MEG). Ultra-high-sensitivity magnetometers made with superconductingquantum interference device (SQUID) can detect extremely weak