The dorsolateral prefrontal cortex plays a role in self-initiated elaborative cognitive processing during episodic
Colin Hawco1, Marcelo T Berlim, Martin Lepage
1Department of Neurology and Neurosurgery, Douglas Mental Health University Institute, McGill University, Montreal, Quebec, Canada.
Plos One
|September 17, 2013
Summary
The left dorsolateral prefrontal cortex (DLPFC) is crucial for self-initiated memory strategies. Disrupting the DLPFC impaired recall for high strategy users but improved it for low strategy users during encoding.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Memory Research
Background:
- Elaborative cognitive processing enhances episodic memory encoding and recall.
- Neural mechanisms of encoding strategies are well-studied, but self-initiated strategy use is less explored.
- Repetitive transcranial magnetic stimulation (rTMS) can probe the causal role of brain regions in cognitive tasks.
Purpose of the Study:
- To investigate the role of the left dorsolateral prefrontal cortex (DLPFC) in the self-initiation of elaborative encoding strategies.
- To examine how disrupting the left DLPFC affects memory performance under cued versus self-initiated encoding conditions.
- To explore the relationship between individual differences in strategy use and the effects of DLPFC stimulation on memory.
Main Methods:
- Repetitive transcranial magnetic stimulation (rTMS) was applied to the left DLPFC or vertex (control) during an associative word-pair encoding task.
- Participants were assigned to either a cued (semantic analysis) or self-initiated (memorization) encoding condition.
- Memory performance was assessed using a cued-recall task, and participants completed a strategy use questionnaire.
Main Results:
- A significant interaction between rTMS site, encoding condition, and strategy use was found for related word pairs in the self-initiated condition.
- Left DLPFC stimulation reduced recall performance in high strategy users but tended to increase recall in low strategy users during self-initiated encoding.
- No significant effects were observed in the cued condition or for unrelated word pairs.
Conclusions:
- The left DLPFC appears to play a critical role in the self-initiation of elaborative memory encoding strategies.
- Individual differences in strategy use modulate the neural processes engaged during memory encoding.
- These findings suggest that distinct neural networks are recruited depending on whether encoding strategies are externally cued or self-initiated.
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