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Slow Theta tACS of the Right Parietal Cortex Enhances Contralateral Visual Working Memory Capacity

  • Monika Bender
  • Vincenzo Romei
  • Paul SausengEmail author
Brief Communication
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Abstract

Recent research suggests alteration of visual working memory capacity by modulation of parietal theta frequency via transcranial alternating current stimulation (tACS). However, it remains to be clarified whether this effect is partly driven by co-stimulation of prefrontal cortex and subcortical structures. It was hypothesized that focal tACS over the parietal lobe without additional prefrontal or subcortical stimulation should lead to similar effects as reported in the literature. Healthy, young participants were tested on a visual working memory paradigm while receiving either focal parietal tACS at 4 Hz, at 7 Hz or sham stimulation. Focal right posterior 4 Hz tACS led to increased working memory capacity strictly for the visual hemifield contralateral to stimulation. Exclusive stimulation of posterior cortex by 4 Hz tACS replicates effects recently reported in literature, confirming that stimulation of the prefrontal cortex or subcortical structures are not a primary driver of these observations.

Keywords

Focal tACS Modulation of brain frequencies Nesting of oscillations Theta:gamma coupling 

Notes

Acknowledgements

This research was supported by the Deutsche Forschungsgemeinschaft DFG (Grant SA 1872/2-1 to PS) and the BIAL Foundation (Grant Number 204/2018 to VR).

Supplementary material

10548_2019_702_MOESM1_ESM.docx (81 kb)
Supplementary material 1 (DOCX 80 KB)

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of PsychologyLudwig-Maximilians-Universität MünchenMunichGermany
  2. 2.Dipartimento di PsicologiaUniversità di BolognaCesenaItaly

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