【摘要】 目的研究视觉空间记忆和抽象几何图形记忆的工作记忆负荷对脑电事件相关同步化和去同步化的影响。方法采用n back范式 ,取n分别等于 1、2、3为 3种负荷水平。 1 2名被试者在 3种负荷水平下完成视觉空间匹配和抽象几何图形匹配两类记忆任务 ,并记录其脑电。结果theta波的ERS总是伴随着alpha波的ERD出现。随着任务难度的增大 ,6～ 8Hz的theta波的ERS下降 ,alpha波的ERD增大。图形匹配任务引出的thetaERS和alphaERD均大于空间位置匹配任务。任务难度和任务类型的效应大多出现在CZ和FZ电极 ,这与任务所包含的注意和记忆的加工主要激活额叶和顶叶皮层的观点相符合。结论EEG的ERD(或ERS)随视觉记忆负荷变化 ,因此可作为反映视觉记忆负荷的有效指标更多还原

【Abstract】 Objective To examine the effect of visual working memory load on the event related EEG synchronization and desynchronization. Method EEG was recorded when 12 normal participants were performing the visual spatial matching task and the abstract geometrical figure matching task in the n back paradigm in which the memory load varied from 1 to 3. Result Theta ERS was observed along with alpha ERD. As the memory load increased, the 6～8 Hz ERS decreased and the alpha ERD increased. The theta ERS and alpha ERD elicited by the figure matching task were larger than those in the visual spatial matching task. The fact that most of the differences were observed in the CZ and FZ electrodes was in line with the view that the activation of attention and working memory was often found in prefrontal and parietal regions. Conclusion The event related EEG synchronization and desynchronization varies with the visual memory load and therefore are good indicators of memory load.更多还原