Investigating the neural correlates of schemas: Ventromedial prefrontal cortex is necessary for normal schematic influence on memory

Schemas, as memory representations of typical contexts, allow for generalization from previous experiences while often improving memory organization and accuracy. However, these advantageous characteristics of schematic memory may come at the cost of episodespecific information. In the human brain, this tradeoff between general and specific knowledge has been linked to differential contributions of the medial temporal lobes (MTL) to episode-specific memory and the ventromedial prefrontal cortex (vmPFC) to generalized, schematic memory. Here, we used a neuropsychological approach to test whether participants with focal vmPFC damage (n=6) would show a reduced influence of schematic memory relative to healthy normal comparison participants (n=12) in a recognition task that presented schematically congruent or incongruent contexts at study. As predicted, normal comparison participants were more likely to identify items as old after studying them in congruent contexts, and this effect was reflected in increased true and false recognition. These effects of prior context on recognition were not observed in the vmPFC group, suggesting that vmPFC damage reduced the influence of schematic memory. These findings are consistent with the proposition that the vmPFC plays an important role in integrating previous experience into ongoing memory processes while acting as part of a larger memory network.