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Transcranial Direct Current Stimulation tDCS for Memory Enhancement
Published on: September 18, 2021
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Impact of oscillatory tDCS targeting left prefrontal cortex on source memory retrieval
Eda Mizrak1, Kamin Kim1, Brooke Roberts1
1a Department of Psychology , University of California at Davis , Davis , CA , USA.
Cognitive Neuroscience
|August 21, 2018
Summary
Oscillatory transcranial direct current stimulation (otDCS) targeting theta brainwaves unexpectedly impaired source memory retrieval. This non-invasive brain stimulation also reduced theta activity specificity during memory recall.
Area of Science:
- Neuroscience
- Cognitive Science
Background:
- Transcranial direct current stimulation (tDCS) research is expanding, yet its effects on memory remain debated.
- Theta band neural oscillations (4-7 Hz) are crucial for episodic and source memory retrieval.
Purpose of the Study:
- To investigate the impact of theta-frequency oscillatory tDCS (otDCS) on episodic memory performance.
- To examine how otDCS influences neural oscillations, specifically theta activity, during memory retrieval.
- To explore the effects of anodal otDCS over the left dorsolateral prefrontal cortex (DLPFC) at 5.5 Hz.
Main Methods:
- Participants underwent two sessions: one with otDCS and one with sham stimulation.
- An item and source recognition paradigm using word stimuli was employed.
- Electroencephalography (EEG) was used to record neural oscillations during memory retrieval.
Main Results:
- otDCS significantly impaired source memory performance compared to sham stimulation.
- EEG analysis revealed otDCS altered pre-stimulus theta power.
- otDCS reduced the specificity of theta activity during source memory retrieval.
Conclusions:
- Non-invasive brain stimulation, like otDCS, can have counterintuitive effects on memory and neural oscillations.
- Measuring neural activity directly aids in interpreting behavioral outcomes of brain stimulation techniques.
- Theta-frequency otDCS over the left DLPFC negatively impacts source memory by altering theta activity patterns.
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