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Transcranial Direct Current Stimulation tDCS for Memory Enhancement
Published on: September 18, 2021
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Transcranial Direct Current Stimulation (tDCS) over the Intraparietal Sulcus Does Not Influence Working Memory
Romain Dumont1, Steve Majerus1,2,3, Michel Hansenne1
1Psychology & Neuroscience of Cognition Research Unit, University of Liège, Belgium.
Psychologica Belgica
|July 19, 2021
Summary
Transcranial direct current stimulation (tDCS) applied to the intraparietal sulcus did not significantly alter visual or verbal working memory performance. Bayesian analysis confirmed no discernible effect of tDCS on working memory tasks.
Area of Science:
- Cognitive Neuroscience
- Neuroscience
Background:
- Transcranial direct current stimulation (tDCS) has shown mixed results in modulating working memory.
- Previous research primarily focused on the dorsolateral prefrontal cortex, neglecting other critical areas like the intraparietal sulcus (IPS).
Purpose of the Study:
- To investigate the effects of tDCS on working memory by targeting the left intraparietal sulcus (IPS).
- To examine the impact of anodal and cathodal tDCS on both visual and verbal working memory tasks with varying cognitive loads.
Main Methods:
- A within-participant design was employed, with participants undergoing anodal, cathodal, and sham tDCS conditions.
- Visual working memory task involved memorizing colored figures; verbal working memory task involved memorizing letter strings.
- Working memory load was manipulated (high vs. low) in both tasks.
Main Results:
- No significant differences in accuracy or reaction time were observed across the anodal, cathodal, and sham tDCS conditions for either task.
- Bayesian analysis provided evidence supporting the absence of a significant effect of tDCS on working memory performance.
Conclusions:
- Single-session tDCS applied to the left IPS does not appear to modulate working memory capacity or efficiency.
- These findings contribute to the ongoing debate and highlight the inconsistent effects of tDCS on working memory across different stimulation sites and tasks.
