中文摘要：

采用事件相关电位方法,通过两个实验分别考察不同测验范式（排除范式和三键范式）对图形位置来源提取头皮分布特性的影响,以检验前人得出的测验范式对颜色来源提取ERPs影响较小的结论是否适用于其他来源类型这一问题。结果显示,相比于项目再认,实验一中与图形位置来源提取关联的正走向新/旧效应的头皮分布更广;实验二则得出反映位置来源提取的晚期负走向新/旧效应。可见,两类测验范式条件下与位置来源提取关联新/旧效应的头皮分布时空特征有所不同。上述结果表明：与颜色来源研究不同,测验范式对位置来源提取关联的神经机制具有明显调节作用。

英文摘要：

Previous behavioral research has shown evidence for the dissociation between the remembering of an event and the contextual details in which this event occurred. The first task is called item memory and the second is referred to as source memory. The dissociation between these two tasks is further reinforced by event-related potentials （ERP） studies. The binding of distinct sources with items also differs under certain circumstances, which has been confirmed by using ERP or other measures. Moreover, the testing style, aging, material and many other factors can regulate the spatial and temporal distributive characteristic of the old/new effect for both item memory and source memory. To verify whether the minimum impact of testing paradigms on the neural correlation of color source retrieval reported by Cycowicz and his collaborators also held true in other sources, two ERP experiments were conducted to investigate the impact of two types of testing paradigms （exclusion and three-key paradigms） on the temporal and the spatial distributions of the old/new effect for the location source retrieval task, in which both of these experiments used pictures as stimuli. Thirty-three subjects participated in the two experiments, sixteen of them for the first experiment, and the rest for the second one. In the first experiment, stimuli were presented either on the left of the screen or on the right side during the study phase and then two tests were performed separately with pictures presented on the center of the screen. One test task was to discriminate the old items from the new ones, and the other task was to judge the items presented on certain location during the study phase as targets and to judge other ones as non-targets. In the second experiment, the source test was to judge each item with three different keys based on its context during the study phase. Two-way repeated-measures ANOVAs were performed with response （2 levels） and electrode （4 levels） served as within-subject variables to test the old/