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A Systematic Review and Meta-Analysis of the Effects of Transcranial Direct Current Stimulation (tDCS) on Episodic Memory.

Galli, Giulia and Vadillo, Miguel A and Sirota, Miroslav and Feurra, Matteo and Medvedeva, Angela (2018) 'A Systematic Review and Meta-Analysis of the Effects of Transcranial Direct Current Stimulation (tDCS) on Episodic Memory.' Brain Stimulation. ISSN 1876-4754

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Abstract

Background: In the past decade, several studies have examined the effects of transcranial direct current stimulation (tDCS) on long-term episodic memory formation and retrieval. These studies yielded conflicting results, likely due to differences in stimulation parameters, experimental design and outcome measures. Objectives: In this work we aimed to assess the robustness of tDCS effects on long-term episodic memory using a meta-analytical approach. Methods: We conducted four meta-analyses to analyse the effects of anodal and cathodal tDCS on memory accuracy and response times. We also used a moderator analysis to examine whether the size of tDCS effects varied as a function of specific stimulation parameters and experimental conditions. Results: Although all selected studies reported a significant effect of tDCS in at least one condition in the published paper, the results of the four meta-analyses showed only statistically non-significant close-to-zero effects. A moderator analysis suggested that for anodal tDCS, the duration of the stimulation and the task used to probe memory moderated the effectiveness of tDCS. For cathodal tDCS, site of stimulation was a significant moderator, although this result was based on few observations. Conclusions: To warrant theoretical advancement and practical implications, more rigorous research is needed to fully understand whether tDCS reliably modulates episodic memory, and the specific circumstances under which this modulation does, and does not, occur.

Item Type: Article
Uncontrolled Keywords: meta-analysis, episodic memory, long-term memory, recall, recognition, transcranial direct current stimulation, non-invasive brain stimulation
Subjects: R Medicine > RC Internal medicine > RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry
Divisions: Faculty of Science and Health > Psychology, Department of
Depositing User: Elements
Date Deposited: 19 Nov 2018 10:11
Last Modified: 05 Dec 2018 20:15
URI: http://repository.essex.ac.uk/id/eprint/23488

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