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Transcranial direct current stimulation based metaplasticity protocols in working memory.

Sandra Carvalho1, Paulo S Boggio2, Óscar F Gonçalves3

  • 1Neuropsychophysiology Laboratory, CIPsi, School of Psychology (EPsi), University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal; Spaulding Neuromodulation Center, Department of Physical Medicine and Rehabilitation, Spaulding Rehabilitation Hospital, Harvard Medical School, Boston, MA, USA; Department of Physical Medicine and Rehabilitation, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA.

Brain Stimulation
|January 1, 2015
PubMed
Summary
This summary is machine-generated.

Investigating transcranial direct current stimulation (tDCS) metaplasticity, this study found that cathodal tDCS improved working memory, while anodal tDCS did not. The interval between stimulation sessions influenced these cognitive effects.

Keywords:
DLPFCMetaplasticityN-BackPre-conditioning and conditioning tDCSWorking memory

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Neuromodulation

Background:

  • Transcranial direct current stimulation (tDCS) intervals impact motor plasticity via metaplasticity.
  • Metaplasticity, where prior neural network activity modifies subsequent interventions, is less understood in cognitive functions.
  • Limited data exists on tDCS metaplasticity effects on cognitive performance.

Purpose of the Study:

  • To investigate tDCS-based metaplasticity protocols for working memory (WM).
  • To assess the impact of varying inter-stimulation intervals on 3-back task performance.
  • To explore how different tDCS polarities and intervals affect cognitive function.

Main Methods:

  • 15 healthy volunteers participated in each experiment.
  • Anodal tDCS metaplasticity was tested with 10+10 min sessions at 1 mA, using 10, 30, or 60 min intervals.
  • Cathodal or anodal-cathodal tDCS protocols with a 10 min interval were also evaluated.

Main Results:

  • Anodal tDCS, with 10, 30, or 60 min intervals, did not enhance WM performance.
  • Consecutive cathodal tDCS sessions with a 10 min interval significantly improved performance on the 3-back task.
  • No significant difference was observed in WM performance with anodal tDCS, regardless of the interval.

Conclusions:

  • Working memory responses to tDCS polarity depend on the prior activity state of neural populations.
  • Cathodal tDCS, under specific interval conditions, can enhance working memory.
  • The findings highlight the importance of stimulation timing and polarity in tDCS cognitive applications.