Strategy-dependent changes in memory: Effects on behavior and brain activity
Strategy-dependent changes in memory: Effects on behavior and brain activity
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DOI：
10.3758/cabn.3.3.155
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发表时间：
2003-09-01
影响因子：
2.9
通讯作者：
Braver, Todd S.
中科院分区：
文献类型：
--
作者：
Speer, Nicole K.;Jacoby, Larry L.;Braver, Todd S.
本研究采用内隐策略操作来探讨记忆策略对大脑激活和行为表现的影响。通过对任务上下文的操纵，参与者被偏向于在单个记忆任务中使用短期（以维持为重点）或长期（以检索为重点）记忆策略。通过比较不同任务背景下的直接匹配试验，我们观察到行为表现和大脑活动在主要位于外侧和内侧额叶皮层的区域网络中的明显变化。这些记忆策略操作的影响表明，当一个以检索为中心的策略被诱导时，助记过程在编码期间优先参与。相反，当诱导以维护为中心的策略时，在延迟和响应期间优先使用助记过程。综上所述，研究结果表明，在记忆任务中，隐性认知策略在调节大脑激活和行为方面发挥着重要作用。
In the present study, an implicit strategy manipulation was used to explore the contribution of memory strategy to brain activation and behavioral performance. Participants were biased to use either a short-term( maintenance-focused) or long-term(retrieval-focused) memory strategy within a single memory task through manipulation of task context. In comparing directly matched trials across the different task contexts, we observed clear changes in both behavioral performance and brain activity across a network of regions located primarily within lateral and medial frontal cortex. These effects of the memory strategy manipulation suggest that when a retrieval-focused strategy is induced, mnemonic processes are preferentially engaged during the encoding period. In contrast, when a maintenance-focused strategy is induced, mnemonic processes are preferentially engaged during the delay and response periods. Taken together, the results imply that covert cognitive strategies play an important role in modulating brain activation and behavior during memory tasks.