Abstract
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 shortterm (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.
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This research was supported by National Institute of Mental Health Grant RO3 MH61615 to T.S.B. as well as by a National Science Foundation Graduate Research Fellowship to N.K.S. We thank Susan Bongiolatti and Mitch Dornfeld for help in data collection and Deanna Barch, Jeremy Reynolds, Jeffrey Zacks, and three anonymous reviewers for helpful comments on the manuscript.
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Speer, N.K., Jacoby, L.L. & Braver, T.S. Strategy-dependent changes in memory: Effects on behavior and brain activity. Cognitive, Affective, & Behavioral Neuroscience 3, 155–167 (2003). https://doi.org/10.3758/CABN.3.3.155
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DOI: https://doi.org/10.3758/CABN.3.3.155