scholarly journals Electrifying discourse: Anodal tDCS of the primary motor cortex selectively reduces action appraisal in naturalistic narratives

Cortex ◽  
2020 ◽  
Vol 132 ◽  
pp. 460-472
Author(s):  
Agustina Birba ◽  
Francesca Vitale ◽  
Iván Padrón ◽  
Martín Dottori ◽  
Manuel de Vega ◽  
...  
Keyword(s):  
Motor Cortex ◽  
Primary Motor Cortex ◽  
Anodal Tdcs

scholarly journals Expanding the parameter space of anodal transcranial direct current stimulation of the primary motor cortex

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Desmond Agboada ◽  
Mohsen Mosayebi Samani ◽  
Asif Jamil ◽  
Min-Fang Kuo ◽  
Michael A. Nitsche
Keyword(s):  
Motor Cortex ◽  
Parameter Space ◽  
Primary Motor Cortex ◽  
Cortical Excitability ◽  
Motor Evoked Potentials ◽  
Anodal Tdcs ◽  
Stimulation Parameters ◽  
Motor Cortex Excitability ◽  
The Impact ◽  
Motor Cortex Plasticity

AbstractSize and duration of the neuroplastic effects of tDCS depend on stimulation parameters, including stimulation duration and intensity of current. The impact of stimulation parameters on physiological effects is partially non-linear. To improve the utility of this intervention, it is critical to gather information about the impact of stimulation duration and intensity on neuroplasticity, while expanding the parameter space to improve efficacy. Anodal tDCS of 1–3 mA current intensity was applied for 15–30 minutes to study motor cortex plasticity. Sixteen healthy right-handed non-smoking volunteers participated in 10 sessions (intensity-duration pairs) of stimulation in a randomized cross-over design. Transcranial magnetic stimulation (TMS)-induced motor-evoked potentials (MEP) were recorded as outcome measures of tDCS effects until next evening after tDCS. All active stimulation conditions enhanced motor cortex excitability within the first 2 hours after stimulation. We observed no significant differences between the three stimulation intensities and durations on cortical excitability. A trend for larger cortical excitability enhancements was however observed for higher current intensities (1 vs 3 mA). These results add information about intensified tDCS protocols and suggest that the impact of anodal tDCS on neuroplasticity is relatively robust with respect to gradual alterations of stimulation intensity, and duration.

scholarly journals Anodal tDCS over the primary motor cortex improves motor imagery benefits on postural control: A pilot study

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Elodie Saruco ◽  
Franck Di Rienzo ◽  
Susana Nunez-Nagy ◽  
Miguel A. Rubio-Gonzalez ◽  
Philip L. Jackson ◽  
...  
Keyword(s):  
Pilot Study ◽  
Motor Cortex ◽  
Postural Control ◽  
Motor Imagery ◽  
Primary Motor Cortex ◽  
Anodal Tdcs

scholarly journals Treadmill training combined with transcranial direct current stimulation over the primary motor cortex in a child with cerebral palsy and hydrocephalus: A case report.

2014 ◽  
Vol 12 ◽  
pp. 210
Author(s):  
Fernanda Lobo Rezende ◽  
Natália De Almeida Carvalho Duarte ◽  
Luanda André Collange Grecco ◽  
Claudia Santos Oliveira
Keyword(s):  
Cerebral Palsy ◽  
Motor Cortex ◽  
Direct Current ◽  
Transcranial Direct Current Stimulation ◽  
Primary Motor Cortex ◽  
Treadmill Training ◽  
Anodal Tdcs ◽  
Direct Current Stimulation ◽  
Eyes Closed ◽  
Intervention Protocol

Introduction: Transcranial direct current stimulation (tDCS) is a promising technique that stimulates the cortex with a direct, low-intensity electric current and can potentiate motor learning. Objective: Describe the results of an intervention protocol involving anodal stimulation over the primary motor cortex combined with treadmill training in a child with cerebral palsy. Method: The intervention was comprised of ten sessions of anodal tDCS (1mA) over the primary motor cortex during the treadmill training. Stabilometric analysis was evaluated one week before and one week after the intervention. Results: A reduction in oscillations of the COP was found under both conditions (eyes opened and eyes closed. Conclusion: Our findings suggest that anodal tDCS over primary motor cortex can potentiate the results of treadmill training.

Application of anodal tDCS at primary motor cortex immediately after practice of a motor sequence does not improve offline gain

2019 ◽  
Vol 238 (1) ◽  
pp. 29-37
Author(s):  
Jing Chen ◽  
Austin McCulloch ◽  
Hakjoo Kim ◽  
Taewon Kim ◽  
Joohyun Rhee ◽  
...  
Keyword(s):  
Motor Cortex ◽  
Primary Motor Cortex ◽  
Anodal Tdcs ◽  
Motor Sequence

scholarly journals Sensorimotor Robotic Measures of tDCS- and HD-tDCS-Enhanced Motor Learning in Children

2018 ◽  
Vol 2018 ◽  
pp. 1-13 ◽  
Author(s):  
Lauran Cole ◽  
Sean P. Dukelow ◽  
Adrianna Giuffre ◽  
Alberto Nettel-Aguirre ◽  
Megan J. Metzler ◽  
...  
Keyword(s):  
Motor Cortex ◽  
Motor Learning ◽  
Primary Motor Cortex ◽  
Medium Effect ◽  
Sensorimotor Function ◽  
Anodal Tdcs ◽  
Visually Guided ◽  
Direction Error ◽  
Visually Guided Reaching ◽  
The Right

Transcranial direct-current stimulation (tDCS) enhances motor learning in adults. We have demonstrated that anodal tDCS and high-definition (HD) tDCS of the motor cortex can enhance motor skill acquisition in children, but behavioral mechanisms remain unknown. Robotics can objectively quantify complex sensorimotor functions to better understand mechanisms of motor learning. We aimed to characterize changes in sensorimotor function induced by tDCS and HD-tDCS paired motor learning in children within an interventional trial. Healthy, right-handed children (12–18 y) were randomized to anodal tDCS, HD-tDCS, or sham targeting the right primary motor cortex during left-hand Purdue pegboard test (PPT) training over five consecutive days. A KINARM robotic protocol quantifying proprioception, kinesthesia, visually guided reaching, and an object hit task was completed at baseline, posttraining, and six weeks later. Effects of the treatment group and training on changes in sensorimotor parameters were explored. Twenty-four children (median 15.5 years, 52% female) completed all measures. Compared to sham, both tDCS and HD-tDCS demonstrated enhanced motor learning with medium effect sizes. At baseline, multiple KINARM measures correlated with PPT performance. Following training, visually guided reaching in all groups was faster and required less corrective movements in the trained arm (H(2) = 9.250,p=0.010). Aspects of kinesthesia including initial direction error improved across groups with sustained effects at follow-up (H(2) = 9.000,p=0.011). No changes with training or stimulation were observed for position sense. For the object hit task, the HD-tDCS group moved more quickly with the right hand compared to sham at posttraining (χ2(2) = 6.255,p=0.044). Robotics can quantify complex sensorimotor function within neuromodulator motor learning trials in children. Correlations with PPT performance suggest that KINARM metrics can assess motor learning effects. Understanding how tDCS and HD-tDCS enhance motor learning may be improved with robotic outcomes though specific mechanisms remain to be defined. Exploring mechanisms of neuromodulation may advance therapeutic approaches in children with cerebral palsy and other disabilities.

Effects of Anodal Tdcs Over Left Primary Motor Cortex on Bimanual Isometric Force Control

2017 ◽  
Vol 98 (12) ◽  
pp. e172
Author(s):  
Yan Jin ◽  
Sejun Oh ◽  
JaeHyuk Lee ◽  
Maria Celeste Flores Gimenez ◽  
BumChul Yoon
Keyword(s):  
Motor Cortex ◽  
Force Control ◽  
Primary Motor Cortex ◽  
Isometric Force ◽  
Anodal Tdcs

Transcranial direct current stimulation effects on I-wave activity in humans

2011 ◽  
Vol 105 (6) ◽  
pp. 2802-2810 ◽  
Author(s):  
Nicolas Lang ◽  
Michael A. Nitsche ◽  
Michele Dileone ◽  
Paolo Mazzone ◽  
Javier De Andrés-Arés ◽  
...  
Keyword(s):  
Motor Cortex ◽  
Direct Current ◽  
Transcranial Direct Current Stimulation ◽  
Cortical Neurons ◽  
Primary Motor Cortex ◽  
Motor Evoked Potential ◽  
Anodal Tdcs ◽  
Direct Current Stimulation ◽  
Cathodal Tdcs ◽  
Motor Cortex Excitability

Transcranial direct current stimulation (tDCS) of the human cerebral cortex modulates cortical excitability noninvasively in a polarity-specific manner: anodal tDCS leads to lasting facilitation and cathodal tDCS to inhibition of motor cortex excitability. To further elucidate the underlying physiological mechanisms, we recorded corticospinal volleys evoked by single-pulse transcranial magnetic stimulation of the primary motor cortex before and after a 5-min period of anodal or cathodal tDCS in eight conscious patients who had electrodes implanted in the cervical epidural space for the control of pain. The effects of anodal tDCS were evaluated in six subjects and the effects of cathodal tDCS in five subjects. Three subjects were studied with both polarities. Anodal tDCS increased the excitability of cortical circuits generating I waves in the corticospinal system, including the earliest wave (I1 wave), whereas cathodal tDCS suppressed later I waves. The motor evoked potential (MEP) amplitude changes immediately following tDCS periods were in agreement with the effects produced on intracortical circuitry. The results deliver additional evidence that tDCS changes the excitability of cortical neurons.

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