Brain areas where RT improvements were correlated with repetition enhancement during mathematical problem solving. Brain areas in which activation during the novel compared with the repeat trials was associated with RT improvements. Left column: Coronal and sagittal views of the (A) hippocampus, (B) dMCC and SMA, and (C) posterior medial cortex, including the retrosplenial cortex, posterior cingulate cortex. Right column: For all three cortical clusters, improvements in RT were significantly correlated with the percentage signal change between the novel and the repeat trials for the MC but not the NI condition.