- Title
- Unihemispheric concurrent dual-site cathodal transcranial direct current stimulation: the effects on corticospinal excitability
- Creator
- Vaseghi, Bita; Zoghi, Maryam; Jaberzadeh, Shapour
- Date
- 2016
- Type
- Text; Journal article
- Identifier
- http://researchonline.federation.edu.au/vital/access/HandleResolver/1959.17/193104
- Identifier
- vital:18096
- Identifier
-
https://doi.org/10.1111/ejn.13229
- Identifier
- ISSN:0953-816X
- Abstract
- We aimed to assess the effects of concurrent cathodal transcranial direct current stimulation (c‐tDCS) of two targets in a hemisphere, termed unihemispheric concurrent dual‐site cathodal tDCS (c‐tDCSUHCDS), on the size of M1 corticospinal excitability and its lasting effect. Secondary aims were to identify the mechanisms behind the efficacy of c‐tDCSUHCDS and to evaluate the side effects of this new technique. Twelve healthy volunteers received 20 min c‐tDCS under five conditions in a random order: M1 c‐tDCS, c‐tDCSUHCDS of M1–dorsolateral prefrontal cortex (DLPFC), M1–primary sensory cortex (S1), M1–primary visual cortex (V1) and sham. The M1 corticospinal excitability of the first dorsal interossei muscle was assessed before, immediately after, and 30 min, 60 min and 24 h after the interventions. Short‐interval intracortical inhibition (SICI) and intracortical facilitation (ICF) were also assessed, using a paired‐pulse paradigm. Compared to conventional M1 c‐tDCS, corticospinal excitability significantly increased following c‐tDCSUHCDS of M1‐DLPFC and M1‐V1 for up to 24 h (P = 0.001). Significant increases in ICF were observed following c‐tDCSUHCDS of M1‐DLPFC (P = 0.005) and M1‐V1 (P = 0.002). Compared to baseline values, ICF and SICI increased significantly at T60 (P < 0.001) and T24 h (P < 0.001) following the concurrent c‐tDCS of M1 and V1. Sham c‐tDCSUHCDS did not induce any significant alteration. The corticospinal excitability increase was mainly accompanied by ICF increase, which indirectly indicates the activity of glutamergic mechanisms. The findings may help us to more fully understand the brain function and develop future motor learning studies. No significant excitability change induced by sham c‐tDCSUHCDS suggests that there is no placebo effect associated with this new tDCS technique. Corticospinal excitability of primary motor cortex (M1) significantly increased by unihemispheric concurrent dual‐site cathodal tDCS of M1‐dorsolateral prefrontal cortex and M1‐primary visual cortex for up to 24 h. This increase was mainly accompanied with ICF increase, which indirectly indicates the activity of glutamergic mechanisms.
- Publisher
- Blackwell Publishing Ltd
- Relation
- European Journal of Neuroscience Vol. 43, no. 9 (2016), p. 1161-1172
- Rights
- All metadata describing materials held in, or linked to, the repository is freely available under a CC0 licence
- Rights
- Copyright Wiley
- Subject
- Adult; Cerebral Cortex - physiology; Corticospinal excitability; Female; Functional connectivity; Functional Laterality; Human; Humans; Lasting effect; Male; primary motor cortex; Pyramidal Tracts - physiology; Transcranial Direct Current Stimulation -; Stimulation; 3029 Nerosciences; 5202 Biological pyschology
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