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Effects of Anodal Transcranial Direct Current Stimulation (atDCS) on Sentence Comprehension

  • Jarrad A. G. Lum (a1), Gillian M. Clark (a1), Caitlyn M. Rogers (a1), James D. Skalkos (a1), Ian Fuelscher (a1), Christian Hyde (a1) and Peter G. Enticott (a1)...

Abstract

Objectives: This study examined the effects of anodal transcranial direct current stimulation (a-tDCS) on sentence and word comprehension in healthy adults. Methods: Healthy adult participants, aged between 19 and 30 years, received either a-tDCS over the left inferior frontal gyrus (n=18) or sham stimulation (n=18). Participants completed sentence comprehension and word comprehension tasks before and during stimulation. Accuracy and reaction times (RTs) were recorded as participants completed both tasks. Results: a-tDCS was found to significantly decrease RT on the sentence comprehension task compared to baseline. There was no change in RT following sham stimulation. a-tDCS was not found to have a significant effect on accuracy. Also, a-tDCS did not affect accuracy or RTs on the word comprehension task. Conclusions: The study provides evidence that non-invasive anodal electrical stimulation can modulate sentence comprehension in healthy adults, at least compared to their baseline performance. (JINS, 2019, 25, 331–335)

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Corresponding author

Correspondence and reprint requests to: Jarrad A. G. Lum, Cognitive Neuroscience Unit, School of Psychology, Deakin University, 221 Burwood Highway, Melbourne, VIC, Australia. E-mail: jarrad.lum@deakin.edu.au

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