RT Journal Article
SR Electronic
T1 Dorsolateral Prefrontal Cortex Promotes Long-Term Memory Formation through Its Role in Working Memory Organization
JF The Journal of Neuroscience
JO J. Neurosci.
FD Society for Neuroscience
SP 916
OP 925
DO 10.1523/JNEUROSCI.2353-05.2006
VO 26
IS 3
A1 Robert S. Blumenfeld
A1 Charan Ranganath
YR 2006
UL http://www.jneurosci.org/content/26/3/916.abstract
AB Results from neuroimaging studies have shown that the dorsolateral prefrontal cortex (DLPFC) implements processes critical for organizing items in working memory (WM). Based on its role in WM, we hypothesized that the DLPFC should contribute to long-term memory (LTM) formation by strengthening associations among items that are organized in WM. We conducted an event-related functional magnetic resonance imaging (fMRI) study to test this hypothesis by investigating prefrontal activity during performance of two different WM tasks: on “rehearse” trials, participants actively maintained triplets of words during a brief delay, whereas on “reorder” trials, participants actively organized each triplet during the delay. After scanning, subjects performed an LTM test on words presented during both WM conditions. Behavioral results showed that WM processing in the reorder condition enhanced LTM by strengthening inter-item associations. fMRI results showed that DLPFC activity specifically during reorder trials was predictive of subsequent LTM. In contrast, activity in the posterior ventrolateral prefrontal cortex was predictive of LTM for words studied on both reorder and rehearse trials. These results support the view that the DLPFC contributes to LTM formation through its role in organization of information in WM.