MAGNETOENCEPHALOGRAPHY - DETECTION OF BRAINS ELECTRICAL-ACTIVITY WITH A SUPERCONDUCTING MAGNETOMETER
MAGNETOENCEPHALOGRAPHY - DETECTION OF BRAINS ELECTRICAL-ACTIVITY WITH A SUPERCONDUCTING MAGNETOMETER
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DOI：
10.1126/science.175.4022.664
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发表时间：
1972-01-01
期刊：
影响因子：
56.9
通讯作者：
COHEN, D
中科院分区：
文献类型：
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作者：
COHEN, D
对大脑磁场的测量，称为磁脑图(MEG)，是在一个严密屏蔽的房间里用超导磁强计进行的。这种磁强计已经调整到了比以前更高的灵敏度，因此，第一次可以直接获取MEG的磁强计，而不需要平均噪声。脑磁图与脑电(EEG)同时显示正常受试者的α节律和异常受试者的慢波。正常的脑磁图显示阿尔法节律，当受试者闭上眼睛时，脑电也是如此；然而，这一脑磁图也表明，为了在睁开眼睛时清楚地显示较小的大脑事件，有必要提高探测器灵敏度3倍。脑磁图的异常，包括对直流分量的测量，表明脑磁图可能产生了一些新的信息，与脑电提供的信息不同。
Measurements of the brain's magnetic field, called magnetoencephalograms (MEG's), have been taken with a superconducting magnetometer in a heavily shielded room. This magnetometer has been adjusted to a much higher sensitivity than was previously attainable, and as a result MEG's can, for the first time, be taken directly, without noise averaging. MEG's are shown, simultaneously with the electroencephalogram (EEG), of the alpha rhythm of a normal subject and of the slow waves from an abnormal subject. The normal MEG shows the alpha rhythm, as does the EEG, when the subject's eyes are closed; however, this MEG also shows that higher detector sensitivity, by a factor of 3, would be necessary in order to clearly show the smaller brain events when the eyes are open. The abnormal MEG, including a measurement of the direct-current component, suggests that the MEG may yield some information which is new and different from that provided by the EEG.