Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/120703
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Type: Journal article
Title: Neurobiological effects of transcranial direct current stimulation in younger adults, older adults and mild cognitive impairment
Author: Emonson, M.
Fitzgerald, P.
Rogasch, N.
Hoy, K.
Citation: Neuropsychologia, 2019; 125:51-61
Publisher: Elsevier
Issue Date: 2019
ISSN: 0028-3932
1873-3514
Statement of
Responsibility: 
M.R.L.Emonson, P.B.Fitzgerald, N.C.Rogasch, K.E.Hoy
Abstract: Transcranial direct current stimulation (tDCS) has been investigated as a way to improve motor and cognitive functioning, with largely variable results. Currently, relatively little is known about the neurobiological effects, and possible drivers of variability, in either healthy or clinical populations. Therefore, this study aimed to characterise the neurobiological effects to tDCS in younger adults, older adults and adults with mild cognitive impairment (MCI), and their relationship to cognitive performance. 20 healthy younger adults, 20 healthy older adults and 9 individuals with MCI participated in the study. All completed neuropsychological tasks and TMS-EEG, prior to and following delivery of 20 min of anodal tDCS to the left dorsolateral prefrontal cortex (DLPFC). EEG was also recorded during the 2-Back working memory task. Following tDCS, younger adults demonstrated alterations in early TMS-Evoked Potentials (TEPs), namely P30 and P60. Both younger and older adults exhibited a larger task-related N250 amplitude after stimulation, with contrasting relationships to cognitive performance. The MCI group showed no change in TEPs or ERPs over time. Comparisons between the groups revealed differences in the change in amplitude of early TEP (P60) and ERP (N100) peaks between younger and older adults. Our findings indicate that tDCS was able to modulate cortical activity in younger and older healthy adults, but in varying ways. These findings suggest that varied response to tDCS may be related to factors such as age and the presence/absence of cognitive impairment, and these factors should be considered when assessing the effectiveness of tDCS in healthy and pathological aging.
Keywords: Aging; Cognition; Neurobiology; Transcranial direct current stimulation; Transcranial magnetic stimulation-electroencephalography
Rights: © 2019 Elsevier Ltd. All rights reserved.
RMID: 0030120379
DOI: 10.1016/j.neuropsychologia.2019.01.003
Grant ID: http://purl.org/au-research/grants/nhmrc/1072057
http://purl.org/au-research/grants/nhmrc/1082894
http://purl.org/au-research/grants/nhmrc/1078567
Appears in Collections:Surgery publications

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