scholarly journals High‐definition transcranial direct current stimulation of the occipital cortices induces polarity dependent effects within the brain regions serving attentional reorientation

2022 ◽  
Author(s):  
Yasra Arif ◽  
Christine M. Embury ◽  
Rachel K. Spooner ◽  
Hannah J. Okelberry ◽  
Madelyn P. Willett ◽  
...  
Keyword(s):  
Direct Current ◽  
Transcranial Direct Current Stimulation ◽  
Brain Regions ◽  
High Definition ◽  
Direct Current Stimulation ◽  
The Brain ◽  
Stimulation Of

High-definition transcranial direct-current stimulation of the right M1 further facilitates left M1 excitability during crossed facilitation

2018 ◽  
Vol 119 (4) ◽  
pp. 1266-1272 ◽  
Author(s):  
Vincent Cabibel ◽  
Makii Muthalib ◽  
Wei-Peng Teo ◽  
Stephane Perrey
Keyword(s):  
Direct Current ◽  
Transcranial Direct Current Stimulation ◽  
Primary Motor Cortex ◽  
Motor Evoked Potentials ◽  
Single Pulse ◽  
High Definition ◽  
Maximum Voluntary Isometric Contraction ◽  
Direct Current Stimulation ◽  
The Right ◽  
Stimulation Of

The crossed-facilitation (CF) effect refers to when motor-evoked potentials (MEPs) evoked in the relaxed muscles of one arm are facilitated by contraction of the opposite arm. The aim of this study was to determine whether high-definition transcranial direct-current stimulation (HD-tDCS) applied to the right primary motor cortex (M1) controlling the left contracting arm [50% maximum voluntary isometric contraction (MVIC)] would further facilitate CF toward the relaxed right arm. Seventeen healthy right-handed subjects participated in an anodal and cathodal or sham HD-tDCS session of the right M1 (2 mA for 20 min) separated by at least 48 h. Single-pulse transcranial magnetic stimulation (TMS) was used to elicit MEPs and cortical silent periods (CSPs) from the left M1 at baseline and 10 min into and after right M1 HD-tDCS. At baseline, compared with resting, CF (i.e., right arm resting, left arm 50% MVIC) increased left M1 MEP amplitudes (+97%) and decreased CSPs (−11%). The main novel finding was that right M1 HD-tDCS further increased left M1 excitability (+28.3%) and inhibition (+21%) from baseline levels during CF of the left M1, with no difference between anodal and cathodal HD-tDCS sessions. No modulation of CSP or MEP was observed during sham HD-tDCS sessions. Our findings suggest that CF of the left M1 combined with right M1 anodal or cathodal HD-tDCS further facilitated interhemispheric interactions during CF from the right M1 (contracting left arm) toward the left M1 (relaxed right arm), with effects on both excitatory and inhibitory processing. NEW & NOTEWORTHY This study shows modulation of the nonstimulated left M1 by right M1 HD-tDCS combined with crossed facilitation, which was probably achieved through modulation of interhemispheric interactions.

Double transcranial direct current stimulation of the brain increases cerebral energy levels and systemic glucose tolerance in men

2019 ◽  
Vol 31 (4) ◽  
pp. e12688 ◽  
Author(s):  
Ewelina K. Wardzinski ◽  
Lisa Friedrichsen ◽  
Sina Dannenberger ◽  
Alina Kistenmacher ◽  
Uwe H. Melchert ◽  
...  
Keyword(s):  
Glucose Tolerance ◽  
Direct Current ◽  
Transcranial Direct Current Stimulation ◽  
Energy Levels ◽  
Direct Current Stimulation ◽  
The Brain ◽  
Stimulation Of

COMPUTATIONAL MODELING OF TRANSCRANIAL DIRECT CURRENT STIMULATION IN THE CHILD BRAIN: IMPLICATIONS FOR THE TREATMENT OF REFRACTORY CHILDHOOD FOCAL EPILEPSY

2014 ◽  
Vol 24 (02) ◽  
pp. 1430006 ◽  
Author(s):  
MARTA PARAZZINI ◽  
SERENA FIOCCHI ◽  
ILARIA LIORNI ◽  
ALBERTO PRIORI ◽  
PAOLO RAVAZZANI
Keyword(s):  
Electric Field ◽  
Computational Modeling ◽  
Direct Current ◽  
Transcranial Direct Current Stimulation ◽  
Focal Epilepsy ◽  
Brain Area ◽  
Epileptiform Activity ◽  
Brain Regions ◽  
Direct Current Stimulation ◽  
The Brain

Transcranial direct current stimulation (tDCS) was recently proposed for the treatment of epilepsy. However, the electrode arrangement for this case is debated. This paper analyzes the influence of the position of the anodal electrode on the electric field in the brain. The simulation shows that moving the anode from scalp to shoulder does influence the electric field not only in the cortex, but also in deeper brain regions. The electric field decreases dramatically in the brain area without epileptiform activity.

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