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Related Experiment Video

Updated: Feb 16, 2026

Transcranial Direct Current Stimulation tDCS for Memory Enhancement
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No Interaction between tDCS Current Strength and Baseline Performance: A Conceptual Replication.

Gemma Learmonth1,2, Francesca Felisatti2, Numaya Siriwardena2

  • 1Centre for Cognitive Neuroimaging, Institute of Neuroscience and Psychology, University of Glasgow, Glasgow, United Kingdom.

Frontiers in Neuroscience
|December 19, 2017
PubMed
Summary
This summary is machine-generated.

This study investigated transcranial direct current stimulation (tDCS) effects on spatial attention. Results showed no significant interaction between stimulation intensity and baseline performance, questioning previous findings and highlighting the need for replication in non-invasive brain stimulation research.

Keywords:
bayesian analysisplasticitypseudoneglectreplicationspatial attentiontDCS

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Neuroimaging and Stimulation

Background:

  • Recent studies suggest non-linear effects of transcranial direct current stimulation (tDCS) due to interactions between stimulation parameters and neural state.
  • Previous research indicated a state-dependent interaction between tDCS current strength and baseline performance on visuospatial attention tasks.
  • A prior study found that low-intensity tDCS (1 mA) shifted attention rightward in high-sensitivity individuals, while high-intensity tDCS (2 mA) shifted attention in low-sensitivity individuals.

Purpose of the Study:

  • To replicate previous findings on the interaction between tDCS current strength and baseline performance on a visuospatial attention task.
  • To investigate these effects using a within-subject design, allowing direct comparison of different current intensities within individuals.

Main Methods:

  • Thirty young adults participated in a within-subject design.
  • Participants received 15 minutes of 1 mA tDCS, 2 mA tDCS, and a sham protocol on separate days.
  • The visuospatial attention (landmark) task was used to assess performance and spatial attention shifts.

Main Results:

  • No overall rightward shift in spatial attention was observed with either 1 mA or 2 mA tDCS.
  • No significant interaction was found between baseline performance and tDCS current strength.
  • The results failed to replicate the state-dependent interaction previously reported.

Conclusions:

  • The findings provide further evidence for the low replicability of non-invasive brain stimulation protocols.
  • These results underscore the necessity for further replication attempts to validate key experimental findings in the field.
  • The interaction between tDCS intensity and baseline performance on visuospatial attention may not be robust.