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Transcranial Direct Current Stimulation tDCS for Memory Enhancement
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Shaping memory accuracy by left prefrontal transcranial direct current stimulation.

Bastian Zwissler1, Christoph Sperber, Sina Aigeldinger

  • 1Department of Psychiatry and Psychotherapy, Neurophysiology & Interventional Neuropsychiatry, University of Tübingen, 72076 Tübingen, Germany, Department of Psychology, Affective Neuropsychology, University of Bielefeld, 33501 Bielefeld, Germany, and Werner Reichardt Centre for Integrative Neuroscience, University of Tübingen, 72076 Tübingen, Germany.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|March 14, 2014
PubMed
Summary
This summary is machine-generated.

Noninvasive brain stimulation using transcranial direct current stimulation (tDCS) can modulate false memory formation. Anodal tDCS increased false recognition, while cathodal tDCS reduced it, suggesting a role for the left prefrontal cortex in memory accuracy.

Keywords:
brain stimulationdorsolateral prefrontal cortexexecutive functionsfalse memorymemory encodingneuroenhancement

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Area of Science:

  • Neuroscience
  • Cognitive Psychology

Background:

  • Human memory is dynamic but prone to distortions.
  • Accurate and false memory rely on executive control mediated by the left prefrontal cortex (PFC).

Purpose of the Study:

  • To investigate the effect of transcranial direct current stimulation (tDCS) on episodic memory accuracy.
  • To determine if tDCS applied to the left dorsolateral PFC (dlPFC) can modulate false recognition.

Main Methods:

  • tDCS was applied to the left dlPFC during the encoding phase of a picture recognition task.
  • Both anodal (excitatory) and cathodal (inhibitory) stimulation polarities were tested.
  • Recognition memory was assessed using lure pictures to measure false alarms.

Main Results:

  • Anodal tDCS during encoding increased false recognition (false alarms).
  • Cathodal tDCS during encoding decreased false recognition.
  • The effects were most pronounced for stimuli that were cued to be remembered.

Conclusions:

  • Left dlPFC excitability, modulated by tDCS polarity, influences episodic memory accuracy.
  • Anodal tDCS may blur memory details, increasing false memories.
  • Cathodal tDCS may act as a "noise filter," reducing imprecise memory traces and false memories.