Working Memory Maintenance Contributes to Long-term Memory Formation: Neural and Behavioral Evidence

@article{Ranganath2005WorkingMM,
  title={Working Memory Maintenance Contributes to Long-term Memory Formation: Neural and Behavioral Evidence},
  author={Charan Ranganath and Michael X. Cohen and Craig J. Brozinsky},
  journal={Journal of Cognitive Neuroscience},
  year={2005},
  volume={17},
  pages={994-1010}
}
Theories of human memory have led to conflicting views regarding the relationship between working memory (WM) maintenance and episodic long-term memory (LTM) formation. Here, we tested the prediction that WM maintenance operates in two stages, and that processing during the initial stage of WM maintenance promotes successful LTM formation. Results from a functional magnetic resonance imaging study showed that activity in the dorsolateral prefrontal cortex and hippocampus during the initial… 
Working memory maintenance contributes to long-term memory formation: Evidence from slow event-related brain potentials
TLDR
Slow potentials were found to be more negative over the parietal and occipital cortex for objects and over the left frontal cortex for letter strings during WM maintenance, which is strongly consistent with the ideas that WM maintenance contributes to LTM formation and that this may occur through strengthening of stimulus-specific cortical memory traces.
Interference of working memory load with long‐term memory formation
TLDR
It is found that maintenance of multiple items deteriorates simultaneous LTM encoding as compared with maintenance of single items, and thus support the idea that WM and LTM processes interact in the MTL.
Dorsolateral Prefrontal Cortex Promotes Long-Term Memory Formation through Its Role in Working Memory Organization
TLDR
The view that the DLPFC contributes to long-term memory (LTM) formation through its role in organization of information in WM is supported by fMRI results.
Expectations of Task Demands Dissociate Working Memory and Long-Term Memory Systems.
TLDR
Results indicate that distinct memory systems are recruited based on anticipated demands of a memory task, and MTL involvement underlies the observed dissociation between WM and LTM performance.
Working Memory-Related Hippocampal Deactivation Interferes with Long-Term Memory Formation
TLDR
Investigation of whether WM-related activity patterns occur also during LTM encoding of sequentially presented items and whether they are related to the primacy effect shows that if processing of items at the beginning of the list is accompanied by hippocampal activity patterns previously observed during hippocampus-dependent WM, these items are subsequently remembered.
Brain activation during associative short-term memory maintenance is not predictive for subsequent retrieval
TLDR
Which brain regions actually support successful WM processing, rather than being confounded by LTM processes, during the maintenance and probe phase of a WM task is examined.
The effect of working memory maintenance on long-term memory
TLDR
Both the new experiments and meta-analysis show clear evidence that increased WM maintenance of a stimulus leads to superior recognition for that stimulus in subsequent LTM tests, and support theories on which there is a close link between WM and LTM mechanisms.
Hippocampus dependent and independent theta-networks ofworking memory maintenance
TLDR
The results demonstrate that working memory maintenance of configural-relational information is supported by a theta synchronous network coupling frontal, temporal and occipital visual areas, and that this theta synchrony is critically dependent on the integrity of the hippocampus.
Prefrontal Cortex and Long-Term Memory Encoding: An Integrative Review of Findings from Neuropsychology and Neuroimaging
  • R. Blumenfeld, C. Ranganath
  • Psychology, Biology
    The Neuroscientist : a review journal bringing neurobiology, neurology and psychiatry
  • 2007
TLDR
Results from neuropsychological and neuroimaging studies of humans are reviewed and a framework to explain how different regions of the PFC contribute to successful LTM formation is presented, suggesting dorsolateral and ventrolateral regions ofThe PFC may implement different control processes that support L TM formation in a complementary fashion.
Electrophysiological signature of working and long‐term memory interaction in the human hippocampus
TLDR
Time‐frequency analysis revealed that a reduction of slow hippocampal activity in the delta frequency range supported LTM formation in the low load condition, but not during high WM load, which indicates that multi‐item WM and LTM encoding interfere within the hippocampus.
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