scholarly journals Transcranial direct current stimulation of the motor cortex in waking resting state induces motor imagery

2015 ◽  
Vol 36 ◽  
pp. 298-305 ◽  
Author(s):  
Jana Speth ◽  
Clemens Speth ◽  
Trevor A. Harley
Keyword(s):  
Motor Cortex ◽  
Motor Imagery ◽  
Direct Current ◽  
Transcranial Direct Current Stimulation ◽  
Resting State ◽  
Direct Current Stimulation ◽  
Stimulation Of

Effect of Transcranial Direct Current Stimulation of Motor Cortex in Cerebral Palsy

2018 ◽  
Vol 30 (1) ◽  
pp. 67-71 ◽  
Author(s):  
Natália de Almeida Carvalho Duarte ◽  
Luanda André Collange Grecco ◽  
Roberta Delasta Lazzari ◽  
Hugo Pasini Neto ◽  
Manuela Galli ◽  
...  
Keyword(s):  
Cerebral Palsy ◽  
Motor Cortex ◽  
Direct Current ◽  
Transcranial Direct Current Stimulation ◽  
Direct Current Stimulation ◽  
Stimulation Of

Cathodal transcranial direct current stimulation of the primary motor cortex improves selective muscle activation in the ipsilateral arm

2011 ◽  
Vol 105 (6) ◽  
pp. 2937-2942 ◽  
Author(s):  
Alana B. McCambridge ◽  
Lynley V. Bradnam ◽  
Cathy M. Stinear ◽  
Winston D. Byblow
Keyword(s):  
Motor Cortex ◽  
Upper Limb ◽  
Direct Current ◽  
Transcranial Direct Current Stimulation ◽  
Muscle Activation ◽  
Primary Motor Cortex ◽  
Selectivity Ratio ◽  
Direct Current Stimulation ◽  
Antagonist Muscles ◽  
Stimulation Of

Proximal upper limb muscles are represented bilaterally in primary motor cortex. Goal-directed upper limb movement requires precise control of proximal and distal agonist and antagonist muscles. Failure to suppress antagonist muscles can lead to abnormal movement patterns, such as those commonly experienced in the proximal upper limb after stroke. We examined whether noninvasive brain stimulation of primary motor cortex could be used to improve selective control of the ipsilateral proximal upper limb. Thirteen healthy participants performed isometric left elbow flexion by contracting biceps brachii (BB; agonist) and left forearm pronation (BB antagonist) before and after 20 min of cathodal transcranial direct current stimulation (c-tDCS) or sham tDCS of left M1. During the tasks, motor evoked potentials (MEPs) in left BB were acquired using single-pulse transcranial magnetic stimulation of right M1 150–270 ms before muscle contraction. As expected, left BB MEPs were facilitated before flexion and suppressed before pronation. After c-tDCS, left BB MEP amplitudes were reduced compared with sham stimulation, before pronation but not flexion, indicating that c-tDCS enhanced selective muscle activation of the ipsilateral BB in a task-specific manner. The potential for c-tDCS to improve BB antagonist control correlated with BB MEP amplitude for pronation relative to flexion, expressed as a selectivity ratio. This is the first demonstration that selective muscle activation in the proximal upper limb can be improved after c-tDCS of ipsilateral M1 and that the benefits of c-tDCS for selective muscle activation may be most effective in cases where activation strategies are already suboptimal. These findings may have relevance for the use of tDCS in rehabilitation after stroke.

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