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Transcranial Direct Current Stimulation tDCS for Memory Enhancement
Published on: September 18, 2021
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Establishing a causal role for left ventrolateral prefrontal cortex in value-directed memory encoding with
Linfeng Tony Han1, Michael S Cohen2, Liqin Ken He3
1Department of Psychology, University of California, Los Angeles, Los Angeles, CA, 90095, USA; Department of Psychology, University of Pennsylvania, Philadelphia, PA, 19104, USA; Department of Psychology, Tsinghua University, Beijing, 100084, China.
Neuropsychologia
|January 20, 2023
Summary
Stimulating the left ventrolateral prefrontal cortex (VLPFC) causally enhances memory for high-value items by improving selective encoding. This highlights the VLPFC's role in value-directed memory strategies.
Area of Science:
- Cognitive Neuroscience
- Neurostimulation
Background:
- Memory efficiency relies on selective encoding strategies to prioritize valuable information.
- Previous studies link value-directed memory to left-lateralized semantic processing, especially in the ventrolateral prefrontal cortex (VLPFC).
Purpose of the Study:
- To investigate the causal role of the left VLPFC in memory advantage for high-value items using high-definition transcranial direct current stimulation (HD-tDCS).
Main Methods:
- Healthy young adults underwent sham or anodal HD-tDCS targeting left or right VLPFC during verbal memory encoding.
- Participants encoded word lists with assigned point values.
- Memory performance was assessed via immediate free recall and delayed recognition tests.
Main Results:
- Anodal stimulation of the left VLPFC significantly improved memory encoding selectivity for high-value items compared to sham or right VLPFC stimulation.
- Left VLPFC stimulation specifically enhanced recollection, amplifying the effect of item value on memory retrieval.
- No significant effects were observed with right VLPFC or sham stimulation.
Conclusions:
- The left VLPFC plays a causal role in implementing selective value-directed encoding strategies.
- Left VLPFC stimulation may enhance memory by promoting deeper semantic processing of high-value words.
- Findings support the hemispheric lateralization of value-directed verbal memory encoding.
