Salenius S, Kajola M, Thompson W L, Kosslyn S, Hari R
Low Temperature Laboratory, Helsinki University of Technology, Espoo, Finland.
Electroencephalogr Clin Neurophysiol. 1995 Dec;95(6):453-62. doi: 10.1016/0013-4694(95)00155-7.
Spontaneous MEG signals were recorded during visual imagery from 13 healthy adults with a whole-scalp neuromagnetometer. The parieto-occipital 7-14 Hz alpha activity was suppressed strongly while subjects visualized and evaluated letters. The act of forming a visual image caused a smaller suppression than did inspection of the imaged pattern for a named property. The maximum suppression depended on the baseline alpha level and, for the majority of the subjects, occurred close to the area with the strongest alpha, showing no systematic hemispheric asymmetry. Sources for the alpha activity, modeled with equivalent current dipoles, clustered in the parietal and occipital lobes. The strongest suppression of the activity occurred near the parieto-occipital sulcus.
使用全头型神经磁强计记录了13名健康成年人在视觉想象过程中的自发脑磁图信号。当受试者想象并评估字母时，顶枕部7 - 14Hz的α活动受到强烈抑制。形成视觉图像的行为所导致的抑制比检查想象图案的指定属性时要小。最大抑制程度取决于基线α水平，并且对于大多数受试者来说，发生在α最强的区域附近，未显示出系统性的半球不对称。用等效电流偶极子建模的α活动源聚集在顶叶和枕叶。活动的最强抑制发生在顶枕沟附近。
