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Related Concept Videos

Working Memory01:24

Working Memory

448
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...
448

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Transcranial Direct Current Stimulation tDCS for Memory Enhancement
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Visual working memory performance after the theta cycle length modulation using transcranial alternating current.

Michał Ociepka1, Paweł Basoń1, Suvarna Rekha Chinta1

  • 1Centre for Cognitive Science, Jagiellonian University in Krakow, Poland.

Brain Research
|July 19, 2025
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Summary
This summary is machine-generated.

Modulating brainwave frequencies with transcranial alternating current stimulation (tACS) can enhance working memory. Specifically, decreasing theta frequency improved performance on a change detection task, suggesting targeted brain stimulation for cognitive enhancement.

Keywords:
EEGTheta bandTranscranial alternate current stimulation (tACS)Visual working memorytACS

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Brain Stimulation

Background:

  • Working memory is crucial for cognitive tasks.
  • Theta oscillations are implicated in working memory.
  • Transcranial alternating current stimulation (tACS) is a non-invasive brain stimulation technique.

Purpose of the Study:

  • To investigate if altering theta cycle duration via tACS affects working memory maintenance.
  • To determine the impact of individualized theta frequency stimulation on cognitive performance.

Main Methods:

  • Two experiments were conducted on healthy young adults.
  • Experiment 1 used fixed tACS frequencies (4 vs. 7 Hz).
  • Experiment 2 used individualized theta frequencies, with tACS decreased or increased by 1.5 Hz, alongside EEG recordings.

Main Results:

  • Fixed tACS frequencies did not alter change detection performance.
  • Decreasing individualized theta frequency via tACS significantly improved hit rates in the contralateral hemifield.
  • tACS effects on synchrony measures (Phase-Locking Value, Modulation Index) correlated with behavioral changes.

Conclusions:

  • Individualized tACS, by decreasing theta frequency, can selectively enhance working memory performance.
  • The findings highlight the role of theta oscillations in working memory and the potential of targeted brain stimulation for cognitive enhancement.