短时存贮与复述动态分离的ERP证据

工作记忆参与信息的短时贮存和操作加工。为了分离参与词语短时存贮与复述的脑区及其时间过程，测量并比较了14名正常青年被试进行汉字2-back、0-back和复述任务时的事件相关电位(ERPs)。结果发现，2-back任务减复述任务在头皮后部出现差异波N430，可能反映了信息的短时存贮及其时间进程。2-back任务减0-back任务在头皮前部得到的持续负成分SNC可能是复述加工的动态指标。SNC和N430持续时间的重叠提示，大脑额叶和后部区域分别参与信息的复述和短时存贮，两者的动态分离加工可能是工作记忆中暂时保持的神经基础。

ERP EVIDENCES OF DYNAMIC DISSOCIATION OF SHORT-TERM STORAGE AND REHEARSAL

Working memory (WM) is a system that is used for temporary storage and manipulation of information. For dissociate the brain areas involved in verbal storage and rehearsal, event-related brain potentials were measured when 14 normal young participants were performing 2-back task, 0-back task and rehearsal task of Chinese characters. The difference wave N430 appeared at the posterior of the scalp by subtraction of ERP in the rehearsal task from that in 2-back task, which probably reflected the short-term storage and its time-course. The difference wave of sustained negative component (SNC) appeared at the anterior of the scalp by subtraction of ERP in 0-back task from that in 2-back task, which is a likely dynamic index of rehearsal processes. Frontal lobe and posterior areas of brain maybe govern the rehearsal and short-term storage, respectively. The dynamic division of both areas possibly is neural base of temporarily maintaining in verbal WM.