期刊
BRAIN STIMULATION
卷 9, 期 2, 页码 197-208出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.brs.2015.10.006
关键词
Transcranial direct current stimulation (tDCS); Cognition; Working memory; Dorsolateral prefrontal cortex; Psychiatry
资金
- Australian Postgraduate Award
- National Health and Medical Research Council (NHMRC) [1082894, 1078567]
- National Health and Medical Research Council of Australia [1082894] Funding Source: NHMRC
Background: Several studies have trialled anodal transcranial direct current stimulation (a-tDCS) for the enhancement of working memory (WM) in both healthy and neuropsychiatric populations. However, the efficacy of this technique remains to be clearly established. Objective: This review provides a quantitative synthesis of the published literature investigating the effects of a-tDCS, compared to sham, on WM, as assessed using the n-back, Sternberg and digit-span tasks. We also separated results from tasks performed 'online' (during stimulation) and 'offline' (following stimulation). The secondary aim was to assess for any additional effects of current density and stimulation duration. Methods: Comprehensive literature searches were performed using MEDLINE, Embase, PsychINFO, CENTRAL and Scopus from July 1998 to June 2014. Results: In healthy cohorts, a-tDCS produced a trend towards improvement for offline WM accuracy (p = 0.05) and a small, but significant improvement in reaction time (p = 0.04); however, no significant effects were observed for online tasks (accuracy [p = 0.29], reaction time [p = 0.42]). In the neuropsychiatric cohort, a-tDCS significantly improved accuracy for online (p = 0.003), but not offline (p = 0.87) tasks, and no effect was seen for either online (p = 0.20) or offline (p = 0.49) reaction times. Secondary analyses controlling for current density and stimulation duration provided limited support for the role of these factors in influencing a-tDCS efficacy. Conclusions: This review provides some evidence of a beneficial effect of a-tDCS on WM performance. However, the small effect sizes obtained, coupled with non-significant effects on several analyses require cautious interpretation and highlight the need for future research aimed at investigating more optimised stimulation approaches. (C) 2016 Elsevier Inc. All rights reserved.
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