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Experimental Brain Research

, Volume 237, Issue 5, pp 1315–1324 | Cite as

New information on the effects of transcranial direct current stimulation on n-back task performance

  • Nira MashalEmail author
  • Shlomit Metzuyanim-Gorelick
Research Article

Abstract

The n-back task is prototypical tool widely used to evaluate working memory (WM) abilities in healthy and clinical populations. Previous studies finding beneficial effects of transcranial direct current stimulation (tDCS) over the dorsal lateral prefrontal cortex (DLPFC) on n-back task performance were limited by the number of n-back “memory loads” utilized and the assessment of performance only immediately following stimulation. Our aims were to investigate both the immediate and lasting effects of six sessions of bilateral tDCS over the DLPFC on n-back performance. We used a 1-, 2-, 3-, and 4-back shaped WM task at three time points: pre-stimulation (T1), immediately following a final (6th) stimulation (T2), and 1 month following the final stimulation (T3). Twenty-five right-handed participants were randomly assigned to active or sham stimulation. Performance was evaluated by percentage hits, false alarms, and reaction times (RTs) for correct responses. Results showed lack of improvement in all outcome measures for both groups at T2. Except for general faster RT in the active group, no lasting effect on percentage hits and false alarms was found for all memory loads among both groups at T3. However, lenient analysis indicated improvement in RT for the 1-back memory load among the active group from T1 to T3. These results question the previously found effectiveness of tDCS over the DLPFC in improving short-term n-back performance and cast doubt on its long-term effectiveness.

Keywords

Bilateral stimulation n-Back task tDCS Lasting effect Working memory 

Notes

Acknowledgements

The authors would like to thank Shira Chana Bienstock for her thorough editorial review of this manuscript.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Ethical approval

All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee, and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.The School of EducationBar-Ilan UniversityRamat GanIsrael
  2. 2.Gonda Multidisciplinary Brain Research CenterBar-Ilan UniversityRamat GanIsrael

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