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https://www.readbyqxmd.com/read/29642493/effects-of-tdcs-on-real-time-bci-detection-of-pedaling-motor-imagery
#1
Maria de la Soledad Rodriguez-Ugarte, Eduardo Iáñez, Mario Ortiz-Garcia, José M Azorín
The purpose of this work is to strengthen the cortical excitability over the primary motor cortex (M1) and the cerebro-cerebellar pathway by means of a new transcranial direct current stimulation (tDCS) configuration to detect lower limb motor imagery (MI) in real time using two different cognitive neural states: relax and pedaling MI. The anode is located over the primary motor cortex in Cz, and the cathode over the right cerebro-cerebellum. The real-time brain-computer interface (BCI) designed is based on finding, for each electrode selected, the power at the particular frequency where the most difference between the two mental tasks is observed...
April 8, 2018: Sensors
https://www.readbyqxmd.com/read/29625151/1-ma-cathodal-tdcs-shows-excitatory-effects-in-children-and-adolescents-insights-from-tms-evoked-n100-potential
#2
Vera Moliadze, Ekaterina Lyzhko, Till Schmanke, Saskia Andreas, Christine M Freitag, Michael Siniatchkin
In children and adolescents, 1 mA transcranial direct current stimulation (tDCS) may cause "paradoxical" effects compared with adults: both 1 mA anodal and cathodal tDCS increase amplitude of the motor evoked potential (MEP) as revealed by a single pulse transcranial magnetic stimulation (TMS) of the motor cortex. Here, EEG based evoked potentials induced by a single pulse TMS, particularly the N100 component as marker of motor cortex inhibition, were investigated in order to explain effects of tDCS on the developing brain...
April 3, 2018: Brain Research Bulletin
https://www.readbyqxmd.com/read/29518567/automatic-skull-segmentation-from-mr-images-for-realistic-volume-conductor-models-of-the-head-assessment-of-the-state-of-the-art
#3
Jesper D Nielsen, Kristoffer H Madsen, Oula Puonti, Hartwig R Siebner, Christian Bauer, Camilla Gøbel Madsen, Guilherme B Saturnino, Axel Thielscher
Anatomically realistic volume conductor models of the human head are important for accurate forward modeling of the electric field during transcranial brain stimulation (TBS), electro- (EEG) and magnetoencephalography (MEG). In particular, the skull compartment exerts a strong influence on the field distribution due to its low conductivity, suggesting the need to represent its geometry accurately. However, automatic skull reconstruction from structural magnetic resonance (MR) images is difficult, as compact bone has a very low signal in magnetic resonance imaging (MRI)...
March 5, 2018: NeuroImage
https://www.readbyqxmd.com/read/29513682/single-session-tdcs-over-the-dominant-hemisphere-affects-contralateral-spectral-eeg-power-but-does-not-enhance-neurofeedback-guided-event-related-desynchronization-of-the-non-dominant-hemisphere-s-sensorimotor-rhythm
#4
Valeria Mondini, Anna Lisa Mangia, Angelo Cappello
BACKGROUND AND OBJECTIVE: Transcranial direct current stimulation (tDCS) and neurofeedback-guided motor imagery (MI) have attracted considerable interest in neurorehabilitation, given their ability to influence neuroplasticity. As tDCS has been shown to modulate event-related desynchronization (ERD), the neural signature of motor imagery detected for neurofeedback, a combination of the techniques was recently proposed. One limitation of this approach is that the area targeted for stimulation is the same from which the signal for neurofeedback is acquired...
2018: PloS One
https://www.readbyqxmd.com/read/29476649/efficacy-of-slow-oscillatory-transcranial-direct-current-stimulation-on-eeg-and-memory-contribution-of-an-inter-individual-factor
#5
Ping Chai Koo, Matthias Moelle, Lisa Marshall
Despite many reports on beneficial effects of anodal slow oscillatory-transcranial direct current stimulation (so-tDCS) during non-rapid eye movement (NREM) sleep on memory consolidation, frequent negative outcomes have also been observed. Our working hypothesis is that so-tDCS efficacy is strongly dependent upon the susceptibility of the underlying network. One component determining susceptibility of the network is hypothesized to be reflected in learning or 'task-induced' plastic changes. Another component is hypothesized to represent inter-individual confounds...
February 24, 2018: European Journal of Neuroscience
https://www.readbyqxmd.com/read/29441471/transcranial-direct-current-stimulation-generates-a-transient-increase-of-small-world-in-brain-connectivity-an-eeg-graph-theoretical-analysis
#6
Fabrizio Vecchio, Riccardo Di Iorio, Francesca Miraglia, Giuseppe Granata, Roberto Romanello, Placido Bramanti, Paolo Maria Rossini
Transcranial direct current stimulation (tDCS) is a non-invasive technique able to modulate cortical excitability in a polarity-dependent way. At present, only few studies investigated the effects of tDCS on the modulation of functional connectivity between remote cortical areas. The aim of this study was to investigate-through graph theory analysis-how bipolar tDCS modulate cortical networks high-density EEG recordings were acquired before and after bipolar cathodal, anodal and sham tDCS involving the primary motor and pre-motor cortices of the dominant hemispherein 14 healthy subjects...
February 13, 2018: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/29429773/left-prefrontal-neuronavigated-electrode-localization-in-tdcs-10-20-eeg-system-versus-mri-guided-neuronavigation
#7
Sara De Witte, Debby Klooster, Josefien Dedoncker, Romain Duprat, Jonathan Remue, Chris Baeken
Transcranial direct current stimulation (tDCS) involves positioning two electrodes at specifically targeted locations on the human scalp. In neuropsychiatric research, the anode is often placed over the left dorsolateral prefrontal cortex (DLPFC), while the cathode is positioned over a contralateral cephalic region above the eye, referred-to as the supraorbital region. Although the 10-20 EEG system is frequently used to locate the DLPFC, due to inter-subject brain variability, this method may lack accuracy...
February 3, 2018: Psychiatry Research
https://www.readbyqxmd.com/read/29392156/concurrent-measurement-of-cerebral-hemodynamics-and-electroencephalography-during-transcranial-direct-current-stimulation
#8
Martina Giovannella, David Ibañez, Clara Gregori-Pla, Michal Kacprzak, Guillem Mitjà, Giulio Ruffini, Turgut Durduran
Transcranial direct current stimulation (tDCS) is currently being used for research and treatment of some neurological and neuropsychiatric disorders, as well as for improvement of cognitive functions. In order to better understand cerebral response to the stimulation and to redefine protocols and dosage, its effects must be monitored. To this end, we have used functional diffuse correlation spectroscopy (fDCS) and time-resolved functional near-infrared spectroscopy (TR-fNIRS) together with electroencephalography (EEG) during and after stimulation of the frontal cortex...
January 2018: Neurophotonics
https://www.readbyqxmd.com/read/29361442/effects-of-tdcs-dosage-on-working-memory-in-healthy-participants
#9
Stevan Nikolin, Donel Martin, Colleen K Loo, Tjeerd W Boonstra
BACKGROUND: Transcranial direct current stimulation (tDCS) has been found to improve working memory (WM) performance in healthy participants following a single session. However, results are mixed and the overall effect size is small. Interpretation of these results is confounded by heterogeneous study designs, including differences in tDCS dose (current intensity) and sham conditions used. AIMS: We systematically investigated the effect of tDCS dose on working memory using behavioural and neurophysiological outcomes...
January 8, 2018: Brain Stimulation
https://www.readbyqxmd.com/read/29335751/transcranial-direct-current-stimulation-enhances-foot-sole-somatosensation-when-standing-in-older-adults
#10
Junhong Zhou, On-Yee Lo, Lewis A Lipsitz, Jue Zhang, Jing Fang, Brad Manor
Foot-sole somatosensation is critical for safe mobility in older adults. Somatosensation arises when afferent input activates a neural network that includes the primary somatosensory cortex. Transcranial direct current stimulation (tDCS), as a strategy to increase somatosensory cortical excitability, may, therefore, enhance foot-sole somatosensation. We hypothesized that a single session of tDCS would improve foot-sole somatosensation, and thus mobility, in older adults. Twenty healthy older adults completed this randomized, double-blinded, cross-over study consisting of two visits separated by one week...
March 2018: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/29223708/comparison-of-neuroplastic-responses-to-cathodal-transcranial-direct-current-stimulation-and-continuous-theta-burst-stimulation-in-subacute-stroke
#11
Pierre Nicolo, Cécile Magnin, Elena Pedrazzini, Gijs Plomp, Anaïs Mottaz, Armin Schnider, Adrian G Guggisberg
OBJECTIVE: To investigate the effects of cathodal transcranial direct current stimulation (tDCS) and continuous theta burst stimulation (cTBS) on neural network connectivity and motor recovery in individuals with subacute stroke. DESIGN: Double-blinded, randomized, placebo-controlled study. SETTING: University hospital rehabilitation unit. PARTICIPANTS: Inpatients with stroke (N=41; mean age, 65y; range, 28-85y; mean weeks poststroke, 5; range, 2-10) with resultant paresis in the upper extremity (mean Fugl-Meyer score, 14; range, 3-48)...
December 7, 2017: Archives of Physical Medicine and Rehabilitation
https://www.readbyqxmd.com/read/29214483/psychotherapyplus-augmentation-of-cognitive-behavioral-therapy-cbt-with-prefrontal-transcranial-direct-current-stimulation-tdcs-in-major-depressive-disorder-study-design-and-methodology-of-a-multicenter-double-blind-randomized-placebo-controlled-trial
#12
Malek Bajbouj, Sabine Aust, Jan Spies, Ana-Lucia Herrera-Melendez, Sarah V Mayer, Maike Peters, Christian Plewnia, Andreas J Fallgatter, Lukas Frase, Claus Normann, Nora Behler, Linda Wulf, Eva-Lotta Brakemeier, Frank Padberg
Major Depressive Disorder (MDD) is one of the most prevalent psychiatric disorders worldwide. About 20-30% of patients do not respond to the standard psychopharmacological and/or psychotherapeutic interventions. Mounting evidence from neuroimaging studies in MDD patients reveal altered activation patterns in lateral prefrontal brain areas. Successful cognitive behavioral therapy (CBT) is associated with a recovery of these neural alterations. Moreover, it has been demonstrated that transcranial direct current stimulation (tDCS) is capable of influencing prefrontal cortex activity and cognitive functions such as working memory and emotion regulation...
December 6, 2017: European Archives of Psychiatry and Clinical Neuroscience
https://www.readbyqxmd.com/read/29180006/modulation-of-electric-brain-responses-evoked-by-pitch-deviants-through-transcranial-direct-current-stimulation
#13
Isabelle Royal, Benjamin Rich Zendel, Marie-Ève Desjardins, Nicolas Robitaille, Isabelle Peretz
Congenital amusia is a neurodevelopmental disorder, characterized by a difficulty detecting pitch deviation that is related to abnormal electrical brain responses. Abnormalities found along the right fronto-temporal pathway between the inferior frontal gyrus (IFG) and the auditory cortex (AC) are the likely neural mechanism responsible for amusia. To investigate the causal role of these regions during the detection of pitch deviants, we applied cathodal (inhibitory) transcranial direct current stimulation (tDCS) over right frontal and right temporal regions during separate testing sessions...
January 31, 2018: Neuropsychologia
https://www.readbyqxmd.com/read/29172010/extended-multiple-field-high-definition-transcranial-direct-current-stimulation-hd-tdcs-is-well-tolerated-and-safe-in-healthy-adults
#14
Christopher A Turski, Alanna Kessler-Jones, Clara Chow, Bruce Hermann, David Hsu, Jana Jones, Susanne K Seeger, Rick Chappell, Melanie Boly, Chrysanthy Ikonomidou
BACKGROUND: High definition transcranial direct current stimulation (HD-tDCS) has been administered over single brain regions for small numbers of sessions. Safety, feasibility and tolerability of HD-tDCS over multiple brain regions, multiple daily stimulations and long periods are not established. OBJECTIVE: We studied safety, feasibility and tolerability of daily HD-tDCS over 2-4 brain regions for 20 sessions in healthy adults. METHODS: Five healthy adults underwent physical and neurological examination, electrocardiogram (EKG), electroencephalogram (EEG) and cognitive screening (ImpACT) before, during and after HD-tDCS...
2017: Restorative Neurology and Neuroscience
https://www.readbyqxmd.com/read/29163341/effects-of-transcranial-direct-current-stimulation-transcranial-pulsed-current-stimulation-and-their-combination-on-brain-oscillations-in-patients-with-chronic-visceral-pain-a-pilot-crossover-randomized-controlled-study
#15
Aurore Thibaut, Cristina Russo, Aura Maria Hurtado-Puerto, Jorge Leon Morales-Quezada, Alícia Deitos, John Christopher Petrozza, Steven Freedman, Felipe Fregni
Objective: Chronic visceral pain (CVP) syndromes are persistently painful disorders with a remarkable lack of effective treatment options. This study aimed at evaluating the effects of different neuromodulation techniques in patients with CVP on cortical activity, through electreocephalography (EEG) and on pain perception, through clinical tests. Design: A pilot crossover randomized controlled study. Settings: Out-patient. Subjects: Adults with CVP (>3 months)...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/29160761/fronto-parietal-coherence-response-to-tdcs-modulation-in-patients-with-disorders-of-consciousness
#16
Yang Bai, Xiaoyu Xia, Yong Wang, Yongkun Guo, Yi Yang, Jianghong He, Xiaoli Li
AIM OF THE STUDY: A transcranial direct current stimulation (tDCS) protocol (20 min, 2 mA, anodal electrode at the left dorsolateral prefrontal cortex and cathodal electrode at the right supraorbital area) was applied in patients with different degrees of disorders of consciousness (DoC). Although previous research indicates that it could improve patients' coma recovery scale-revised (CRS-R) scores, the brain's electrophysiological responses to tDCS are still unclear. Therefore, the present study was performed to explore the underlying brain responses of patients in a minimally conscious state (MCS) and an unresponsive wakefulness syndrome (UWS) to tDCS modulation...
November 23, 2017: International Journal of Neuroscience
https://www.readbyqxmd.com/read/29156988/high-definition-transcranial-direct-current-stimulation-in-early-onset-epileptic-encephalopathy-a-case-study
#17
Oded Meiron, Rena Gale, Julia Namestnic, Odeya Bennet-Back, Jonathan David, Nigel Gebodh, Devin Adair, Zeinab Esmaeilpour, Marom Bikson
PRIMARY OBJECTIVE: Early onset epileptic encephalopathy is characterized by high daily seizure-frequency, multifocal epileptic discharges, severe psychomotor retardation, and death at infancy. Currently, there are no effective treatments to alleviate seizure frequency and high-voltage epileptic discharges in these catastrophic epilepsy cases. The current study examined the safety and feasibility of High-Definition transcranial direct current stimulation (HD-tDCS) in reducing epileptiform activity in a 30-month-old child suffering from early onset epileptic encephalopathy...
2018: Brain Injury: [BI]
https://www.readbyqxmd.com/read/29019148/modulating-what-is-and-what-could-have-been-the-effect-of-transcranial-direct-current-stimulation-on-the-evaluation-of-attained-and-unattained-decision-outcomes
#18
Mascha van 't Wout, Hannah Silverman
The affective evaluation of decision outcomes, whether attained (e.g., disappointment) or based on the conscious realization that a decision made differently would have led to a better or worse outcome (e.g., regret), greatly influence future decisions. Prior research has demonstrated a role of the medial and orbitofrontal cortex (M/OFC) in decision valuation and the experience of regret and relief. Here we examined whether inhibitory transcranial direct current stimulation (tDCS) could dampen the experience of decision-induced affect, with a focus on regret and relief...
December 2017: Cognitive, Affective & Behavioral Neuroscience
https://www.readbyqxmd.com/read/28813921/effect-on-the-classification-of-motor-imagery-in-eeg-after-applying-anodal-tdcs-with-a-4%C3%A3-1-ring-montage-over-the-motor-cortex
#19
I N Angulo-Sherman, M Rodriguez-Ugarte, E Ianez, M Ortiz, J M Azorin
Transcranial direct stimulation (tDCS) is a technique for modulating brain excitability that has potential to be used in motor neurorehabilitation by enhancing motor activity, such as motor imagery (MI). tDCS effects depend on different factors, like current density and the position of the stimulating electrodes. This study presents preliminary results of the evaluation of the effect of current density on MI performance by measuring right-hand/feet MI accuracy of classification from electroencephalographic (EEG) measurements after anodal tDCS is applied with a 4×1 ring montage over the right-hand or feet motor cortex...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28729822/low-intensity-focused-tdcs-over-the-motor-cortex-shows-inefficacy-to-improve-motor-imagery-performance
#20
Irma N Angulo-Sherman, Marisol Rodríguez-Ugarte, Eduardo Iáñez, Jose M Azorín
Transcranial direct current stimulation (tDCS) is a brain stimulation technique that can enhance motor activity by stimulating the motor path. Thus, tDCS has the potential of improving the performance of brain-computer interfaces during motor neurorehabilitation. tDCS effects depend on several aspects, including the current density, which usually varies between 0.02 and 0.08 mA/cm(2), and the location of the stimulation electrodes. Hence, testing tDCS montages at several current levels would allow the selection of current parameters for improving stimulation outcomes and the comparison of montages...
2017: Frontiers in Neuroscience
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