CAJ | 학술논문

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。
채용사건상관전위방법,통과량개실험분별고찰불동측험범식（배제범식화삼건범식）대도형위치래원제취두피분포특성적영향,이검험전인득출적측험범식대안색래원제취ERPs영향교소적결론시부괄용우기타래원류형저일문제。결과현시,상비우항목재인,실험일중여도형위치래원제취관련적정주향신/구효응적두피분포경엄;실험이칙득출반영위치래원제취적만기부주향신/구효응。가견,량류측험범식조건하여위치래원제취관련신/구효응적두피분포시공특정유소불동。상술결과표명：여안색래원연구불동,측험범식대위치래원제취관련적신경궤제구유명현조절작용。
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/new effect associated with each retrieval task and the Greenhouse-Geisser epsilon （ε） correction was used where appropriate. For the first experiment, the spatial distribution of the positive-going old/new effect elicited by the location source retrieval task was wider than that of the item recognition task. Whereas, the second experiment recorded reliable negative-going old/new effect correlated with the location source retrieval task relative to that of the item recognition task. Unlike the findings reported by Cycowicz and his collaborators, the results from the current experiments showed that the spatial and temporal distributions of the old/new effects for the location source retrieval tasks with different testing paradigms were also distinct, which indicated the fact that the neural correlation of this task was regulated by the testing style; and the possible reason for this difference was that the binding of location source with item differed from that of the color source. The current results, together with those from Cycowicz and his collaborators＇, suggest that the conclusion based on color source studies holds true only in limited ranges of episodic sources.