Journal
NEUROSCIENCE RESEARCH
Volume 186, Issue -, Pages 21-32Publisher
ELSEVIER IRELAND LTD
DOI: 10.1016/j.neures.2022.10.003
Keywords
Transcranial direct current stimulation; Stroke; Functional magnetic resonance imaging; Functional connectivity; Electric field modeling
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This study aimed to investigate the effects of anodal tDCS on functional changes in sensorimotor areas among chronic stroke survivors. The results showed that anodal tDCS facilitated functional connectivity within the ipsilesional sensorimotor network. Additionally, individual electric field strength was found to predict the functional outcomes.
The neuromodulation effect of anodal tDCS is not thoroughly studied, and the heterogeneous profile of stroke individuals with brain lesions would further complicate the stimulation outcomes. This study aimed to investigate the functional changes in sensorimotor areas induced by anodal tDCS and whether individual electric field could predict the functional outcomes. Twenty-five chronic stroke survivors were recruited and divided into tDCS group (n = 12) and sham group (n = 13). Increased functional connectivity (FC) within the surrounding areas of ipsilesional primary motor cortex (M1) was only observed after anodal tDCS. Averaged FC among the ipsilesional sensorimotor regions was observed to be increased after anodal tDCS (t(11) = 2.57, p = 0.026), but not after sham tDCS (t(12) = 0.69, p = 0.50). Partial least square analysis identified positive correlations between electric field (EF) strength normal to the ipsilesional M1 surface and individual FC changes in tDCS group (r = 0.84, p < 0.001) but not in sham group (r = 0.21, p = 0.5). Our results indicated anodal tDCS facilitates the FC within the ipsilesional sensorimotor network in chronic stroke subjects, and individual electric field predicts the functional outcomes.
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