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Working Memory

Working Memory

Working memory refers to a combination of components, including short-term memory and attention, that allow an individual to hold information temporarily as we perform cognitive tasks. It is an essential cognitive function that enables the execution of complex tasks such as problem-solving, comprehension, and reasoning. Unlike short-term memory, which simply involves the storage of information for a brief period, working memory involves the active manipulation and processing of this...

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Updated: Aug 15, 2025

Transcranial Direct Current Stimulation tDCS for Memory Enhancement

Transcranial Direct Current Stimulation tDCS for Memory Enhancement

Published on: September 18, 2021

Transcranial Direct Current Stimulation Modulates Working Memory Maintenance Processes in Healthy Individuals.

Stevan Nikolin^1,2, Donel Martin^1,2, Colleen K Loo^1,2

¹University of New South Wales, Sydney, Australia.

Journal of Cognitive Neuroscience

|January 5, 2023

Summary

This summary is machine-generated.

Transcranial direct current stimulation (tDCS) reduced frontal theta activity during working memory tasks. This neurophysiological change suggests tDCS selectively disrupts cognitive control and maintenance processes, impacting task performance.

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Area of Science:

Neuroscience
Cognitive Science
Neuroimaging

Background:

Transcranial direct current stimulation (tDCS) is used to modulate brain activity and cognitive functions.
The precise neural mechanisms underlying tDCS effects on working memory remain unclear.
Understanding tDCS effects on specific working memory subprocesses is crucial for interpreting behavioral outcomes.

Purpose of the Study:

To investigate the neurophysiological effects of tDCS on working memory task-related spectral activity.
To determine which specific subprocesses of working memory are affected by tDCS.
To correlate neurophysiological changes with behavioral performance.

Main Methods:

Reanalysis of EEG data from 100 healthy participants performing a 3-back task.
Participants received either sham or active tDCS.
Analysis of event-related spectral power and synchronization in specific frequency bands.

Main Results:

Active tDCS significantly reduced frontal theta event-related synchronization (ERS) post-stimulation.
Participants receiving active tDCS exhibited slower reaction times (RTs) compared to the sham group.
No significant correlation was found between theta ERS and RTs or accuracy.

Conclusions:

tDCS selectively disrupts frontal theta ERS, indicating an impact on working memory cognitive control and maintenance.
The observed neurophysiological changes may explain the heterogeneous behavioral effects of tDCS.
These findings provide insights into the neural basis of tDCS neuromodulation on cognitive functions.