Yoshida H, Iramina K, Ueno S
Department of Computer Science and Communication Engineering, Faculty of Engineering, Kyushu University, Fukuoka, Japan.
Brain Topogr. 1996 Spring;8(3):303-7. doi: 10.1007/BF01184789.
MEG measurements can detect brain sources that are difficult to detect with EEG measurements. The purpose of this study was to investigate models of sleep spindles using both MEG and EEG activities that had been recorded simultaneously. The components of magnetic fields perpendicular to the surface of the head were measured using a DC-SQUID with a first-derivative gradiometer. We propose three models for sleep spindles. In the first model, the source slides into the superficial region of the head so as to be perpendicular to it's surface, and with this model, the power spectrum of the MEG is decreased. In the second model, the source slides into the deeper structures, so that it is perpendicular to the surface. Here, the power spectra of both the MEG and EEG are decreased. The third model has source perpendicular to the surface, leaning and sliding into the deeper structures. Here, the power spectrum of the EEG is decreased but that of the MEG is not.
脑磁图（MEG）测量能够检测出一些用脑电图（EEG）测量难以检测到的脑源。本研究的目的是利用同时记录的MEG和EEG活动来研究睡眠纺锤波的模型。使用带有一阶导数梯度仪的直流超导量子干涉装置（DC-SQUID）测量垂直于头部表面的磁场分量。我们提出了三种睡眠纺锤波模型。在第一个模型中，源滑入头部的浅表区域并与头部表面垂直，在此模型中，MEG的功率谱降低。在第二个模型中，源滑入更深的结构，使其与表面垂直。在这里，MEG和EEG的功率谱均降低。第三个模型的源垂直于表面，倾斜并滑入更深的结构。在这里，EEG的功率谱降低，但MEG的功率谱未降低。
