Results from functional magnetic resonance imaging (fMRI) have strongly supported the idea that the ventrolateral prefrontal cortex (VLPFC) contributes to successful memory formation, but the role the dorsolateral prefrontal cortex (DLPFC) in memory encoding is more controversial. Some findings suggest that the DLPFC is recruited when one is processing relationships between items in working memory, and this processing specifically promotes subsequent memory for these relationships. However, previous studies could not rule out the possibility that DLPFC promotes memory during all elaborative encoding conditions and contributes to memory on all subsequent associative memory tests. To address this question directly, we used functional magnetic resonance imaging (fMRI) to examine activity during two encoding tasks which prompted participants to encode either relational or item-specific information. On relational trials, participants imagined pairs of items interacting, whereas on item-specific trials, participants imagined the items spatially separated and in different sizes. After scanning we examined memory for relational information and item-specific information. FMRI results showed that DLPFC activity specifically promoted memory for relational information during relational encoding and not memory for item-specific information during item-specific encoding. In contrast, activity in the VLPFC predicted memory forboth relational and item-specific information. The present results are consistent withthe idea that the DLPFC specifically contributes to successful memory formation throughits role in building relationships amongst items.
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