Retrieval Goal Modulates Memory for Context.
Retrieval Goal Modulates Memory for Context.
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DOI：
10.1162/jocn_a_00878
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发表时间：
2015-12
影响因子：
3.2
通讯作者：
Rugg MD
中科院分区：
文献类型：
--
作者：
Elward RL;Rugg MD
用功能磁共振成像评估记忆内容是否因提取目标不同而不同。在研究中，视觉呈现的单词被覆盖在城市或乡村场景或灰色背景上。单词-背景对出现在三个空间位置中的一个位置。在扫描测试阶段，呈现已学习和未学习的单词。两个不同的源记忆任务被随机交错。在“背景”任务中，要求判断单词是否出现在两种场景中的一种，而不是交替出现的场景或灰色背景中。在“位置”任务中，区分出现在两个横向位置之一的单词和出现在两个交替位置之一的单词。在这两个任务中，未学习的单词需要单独的回答。在背景任务中，与灰色背景下学习的单词相比，针对场景学习的单词在海马区和脾后皮质中的活性更高，这与先前关于场景恢复效应的报道一致。复职效应在定位任务中也很明显。然而，相对于背景任务，这种影响在海马旁皮质中减弱。在其他区域，包括内侧前额叶和扣带回后部，与场景相关的项目在定位任务中引发的活动低于呈现在灰色背景上的项目。这一发现被解释为语境提取部分受提取目标调节的证据。
fMRI was employed to assess whether the contents of recollection vary according to retrieval goal. At study, visually-presented words were overlaid on urban or rural scenes or a grey background. The word-background pairs were presented in one of three spatial locations. During a scanned test phase, studied and unstudied words were presented. Two different source memory tasks were randomly interleaved. In the ‘background’ task, the requirement was to judge whether the word had been presented against one of the two classes of scene, as opposed to the alternate class or the grey background. In the ‘location’ task, discrimination was between words presented in one of the two lateral locations, and words presented in either of the alternate locations. In both tasks, unstudied words required a separate response. In the background task, words studied against scenes elicited greater activity in parahippocampal and retrosplenial cortex than did words studied against the grey background, consistent with prior reports of scene reinstatement effects. Reinstatement effects were also evident in the location task. Relative to the background task, however, the effects were attenuated in parahippocampal cortex. In other regions, including medial prefrontal and posterior cingulate cortex, activity elicited in the location task by items associated with scenes was lower than that elicited by items presented on the grey background. The findings are interpreted as evidence that contextual retrieval is partially modulated by retrieval goal.
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