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Transcranial alternating current stimulation

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https://www.readbyqxmd.com/read/27901245/transcranial-direct-current-stimulation-for-treatment-resistant-obsessive-compulsive-disorder-report-on-two-cases-and-proposal-for-a-randomized-sham-controlled-trial
#1
Renata de Melo Felipe da Silva, André Russowsky Brunoni, Eurípedes Constantino Miguel, Roseli Gedanke Shavitt
CONTEXT AND OBJECTIVE: Neuromodulation techniques for treating obsessive-compulsive disorder (OCD) have expanded through greater understanding of the brain circuits involved in this disorder. Transcranial direct current stimulation (tDCS), a non-invasive technique, has been studied as an alternative for treatment-resistant OCD. We describe the design of a clinical trial using tDCS for OCD and report on the outcomes from two patients with primary OCD who were resistant to cognitive-behavioral therapy and to selective serotonin reuptake inhibitors, and who received tDCS in an open manner during the training phase for the study procedures...
September 2016: São Paulo Medical Journal, Revista Paulista de Medicina
https://www.readbyqxmd.com/read/27888060/faith-and-oscillations-recovered-on-analyzing-eeg-meg-signals-during-tacs
#2
Toralf Neuling, Philipp Ruhnau, Nathan Weisz, Christoph S Herrmann, Gianpaolo Demarchi
Despite recent success in analyzing brain oscillations recorded during transcranial alternating current stimulation (tACS), the field still requires further research to establish standards in artifact removal methods. This includes taking a step back from the removal of the tACS artifact and thoroughly characterizing the to-be-removed artifact. A recent study by Noury et al. (2016) contributed importantly to this endeavour by showing the existence of nonlinear artefacts in the tACS signal as seen by MEG and EEG...
November 22, 2016: NeuroImage
https://www.readbyqxmd.com/read/27885309/transcranial-direct-current-stimulation-use-in-the-treatment-of-neuropsychiatric-disorders-a-brief-review
#3
Sarah M Szymkowicz, Molly E McLaren, Uma Suryadevara, Adam J Woods
Transcranial direct current stimulation (tDCS) is a non-invasive brain stimulation technique that has grown in popularity over the past two decades as an alternative treatment option for various neuropsychiatric disorders. tDCS modulates cortical excitability through the application of a weak direct current to the scalp via electrodes placed over cortical regions of interest. It has been shown to be a promising and relatively safe treatment tool with few adverse events. In this article, we will briefly review the efficacy of tDCS in depression, bipolar disorder, schizophrenia, and obsessive-compulsive disorder...
November 2016: Psychiatric Annals
https://www.readbyqxmd.com/read/27881788/brain-network-mechanisms-underlying-motor-enhancement-by-transcranial-entrainment-of-gamma-oscillations
#4
Marius Moisa, Rafael Polania, Marcus Grueschow, Christian C Ruff
: Gamma and beta oscillations are routinely observed in motor-related brain circuits during movement preparation and execution. Entrainment of gamma or beta oscillations via transcranial alternating current stimulation (tACS) over primary motor cortex (M1) has opposite effects on motor performance, suggesting a causal role of these brain rhythms for motor control. However, it is largely unknown which brain mechanisms characterize these changes in motor performance brought about by tACS...
November 23, 2016: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/27869996/efficacy-of-noninvasive-brain-stimulation-on-pain-control-in-migraine-patients-a-systematic-review-and-meta-analysis
#5
REVIEW
Lívia Shirahige, Lorena Melo, Fernanda Nogueira, Sérgio Rocha, Kátia Monte-Silva
OBJECTIVE: To evaluate the efficacy of noninvasive brain stimulation (NIBS) on pain control in migraine patients. BACKGROUND: Recent studies have used NIBS as an abortive and prophylactic treatment for migraine; however, its efficacy regarding meaningful clinical effects remains to be critically analyzed. DESIGN: Systematic review of controlled clinical trials. METHODS: Searches were conducted in six databases: MEDLINE (via PubMed), LILACS (via BIREME), CINAHL (via EBSCO), Scopus (via EBSCO), Web of Science, and CENTRAL...
November 2016: Headache
https://www.readbyqxmd.com/read/27857687/transcranial-alternating-current-stimulation-at-beta-frequency-lack-of-immediate-effects-on-excitation-and-interhemispheric-inhibition-of-the-human-motor-cortex
#6
Viola Rjosk, Elisabeth Kaminski, Maike Hoff, Christopher Gundlach, Arno Villringer, Bernhard Sehm, Patrick Ragert
Transcranial alternating current stimulation (tACS) is a form of noninvasive brain stimulation and is capable of influencing brain oscillations and cortical networks. In humans, the endogenous oscillation frequency in sensorimotor areas peaks at 20 Hz. This beta-band typically occurs during maintenance of tonic motor output and seems to play a role in interhemispheric coordination of movements. Previous studies showed that tACS applied in specific frequency bands over primary motor cortex (M1) or the visual cortex modulates cortical excitability within the stimulated hemisphere...
2016: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/27826081/mr-imaging-of-oscillatory-magnetic-field-changes-progressing-from-phantom-to-human
#7
Yuhui Chai, Jingwei Sheng, Weiwei Men, Yang Fan, Bing Wu, Jia-Hong Gao
Detection of ultra-weak oscillatory magnetic field changes using MRI is of great research interest not only for neuronal current MRI of endogenous neuronal oscillations but also for direct visualization of exogenous transcranial currents or iron oxide contrast agent distribution. In this work, we present a novel oscillatory-selective detection (OSD) method that is magnitude-sensitive to the oscillatory magnetic field changes and immune to the main field inhomogeneity. In OSD, a train of 180° pulses with alternating polarity and mirror symmetry are used to refocus and accumulate magnetization changes induced by external oscillatory fields...
November 5, 2016: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/27803651/stimulus-presentation-at-specific-neuronal-oscillatory-phases-experimentally-controlled-with-tacs-implementation-and-applications
#8
Sanne Ten Oever, Tom A de Graaf, Charlie Bonnemayer, Jacco Ronner, Alexander T Sack, Lars Riecke
In recent years, it has become increasingly clear that both the power and phase of oscillatory brain activity can influence the processing and perception of sensory stimuli. Transcranial alternating current stimulation (tACS) can phase-align and amplify endogenous brain oscillations and has often been used to control and thereby study oscillatory power. Causal investigation of oscillatory phase is more difficult, as it requires precise real-time temporal control over both oscillatory phase and sensory stimulation...
2016: Frontiers in Cellular Neuroscience
https://www.readbyqxmd.com/read/27776384/neuro-stimulation-techniques-for-the-management-of-anxiety-disorders-an-update
#9
Sujita Kumar Kar, Siddharth Sarkar
Neuro-stimulation techniques have gradually evolved over the decades and have emerged potential therapeutic modalities for the treatment of psychiatric disorders, especially treatment refractory cases. The neuro-stimulation techniques involves modalities like electroconvulsive therapy (ECT), repetitive transcranial magnetic stimulation (rTMS), transcranial direct current stimulation (tDCS), vagus nerve stimulation (VNS) and others. This review discusses the role of neuro-stimulation techniques in the treatment of anxiety disorders...
November 30, 2016: Clinical Psychopharmacology and Neuroscience: the Official Scientific Journal of the Korean College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/27773729/do-you-see-me-the-role-of-visual-fixation-in-chronic-disorders-of-consciousness-differential-diagnosis
#10
Antonino Naro, Antonino Leo, Antonio Buda, Alfredo Manuli, Alessia Bramanti, Placido Bramanti, Rocco Salvatore Calabrò
Visual fixation (VF) of a target is a possible, although atypical, feature of the Unresponsive Wakefulness Syndrome (UWS). Whether VF may indicate residual awareness in these patients is debatable, since it may simply subtend a series of reflex processes. Objective tools should therefore be used to identify aware VF, which depends on the integrity of visuomotor networks encompassing frontal-parietal-occipital areas. The aim of our study was to detect residual visuomotor network functionality potentially sustaining aware VF...
October 20, 2016: Brain Research
https://www.readbyqxmd.com/read/27766075/measures-to-predict-the-individual-variability-of-corticospinal-responses-following-transcranial-direct-current-stimulation
#11
Nathan D Nuzum, Ashlee M Hendy, Aaron P Russell, Wei-Peng Teo
Individual responses to transcranial direct current stimulation (tDCS) are varied and therefore potentially limit its application. There is evidence that this variability is related to the contributions of Indirect waves (I-waves) recruited in the cortex. The latency of motor-evoked potentials (MEPs) can be measured through transcranial magnetic stimulation (TMS), allowing an individual's responsiveness to tDCS to be determined. However, this single-pulse method requires several different orientations of the TMS coil, potentially affecting its reliability...
2016: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/27759809/transcranial-magnetic-stimulation-and-transcranial-direct-current-stimulation-appear-to-be-safe-neuromodulatory-techniques-useful-in-the-treatment-of-anxiety-disorders-and-other-neuropsychiatric-disorders
#12
Aline Iannone, Antonio Pedro de Mello Cruz, Joaquim Pereira Brasil-Neto, Raphael Boechat-Barros
Transcranial magnetic stimulation (TMS) has recently been investigated as a possible adjuvant treatment for many neuropsychiatric disorders, and has already been approved for the treatment of drug-resistant depression in the United States and in Brazil, among other countries. Although its use in other neuropsychiatric disorders is still largely experimental, many physicians have been using it as an off-label add-on therapy for various disorders. More recently, another technique, transcranial direct current stimulation (tDCS), has also become available as a much cheaper and portable alternative to TMS, although its mechanisms of action are different from those of TMS...
October 2016: Arquivos de Neuro-psiquiatria
https://www.readbyqxmd.com/read/27745724/-noninvasive-cerebral-stimulation-for-treatment-of-adhd-a-review-of-the-literature
#13
L Brandejsky, J-A Micoulaud Franchi, R Lopez, S Bioulac, D Da Fonseca, C Daudet, L Boyer, R Richieri, C Lançon
OBJECTIVES: The aim of this review is to summarize the available data in the literature about the therapeutic applications of transcranial magnetic stimulation and transcranial direct current stimulation in attention-deficit hyperactivity disorder (ADHD). METHOD: The scientific literature search of international articles was performed in February 2016 using the PubMed electronic database. The following MeSH terms were employed: "attention-deficit disorder with hyperactivity" AND "transcranial magnetic stimulation", "attention-deficit disorder with hyperactivity" AND "transcranial direct current stimulation"...
October 10, 2016: L'Encéphale
https://www.readbyqxmd.com/read/27727241/modulation-of-fear-extinction-processes-using-transcranial-electrical-stimulation
#14
R Abend, I Jalon, G Gurevitch, R Sar-El, T Shechner, D S Pine, T Hendler, Y Bar-Haim
Research associates processes of fear conditioning and extinction with treatment of anxiety and stress-related disorders. Manipulation of these processes may therefore be beneficial for such treatment. The current study examines the effects of electrical brain stimulation on fear extinction processes in healthy humans in order to assess its potential relevance for treatment enhancement. Forty-five participants underwent a 3-day fear conditioning and extinction paradigm. Electrical stimulation targeting the medial prefrontal cortex was applied during the extinction-learning phase (Day 2)...
October 11, 2016: Translational Psychiatry
https://www.readbyqxmd.com/read/27697061/therapeutic-noninvasive-brain-stimulation-in-alzheimer-s-disease
#15
Irene Gonsalvez, Roey Baror, Peter Fried, Emiliano Santarnecchi, Alvaro Pascual-Leone
Alzheimer's disease (AD) is a looming public health crisis that currently lacks an effective treatment. Noninvasive Brain Stimulation (NBS), particularly transcranial magnetic stimulation (TMS) and transcranial direct current stimulation (tDCS), offers a promising alternative approach to pharmacological interventions for an increasing number of neurological and psychiatric conditions. The aim of this review is summarize data from therapeutic trials of NBS in AD and other dementing illnesses. Despite the potential of NBS, there is limited theoretical framework and a lack of guidelines for its applications to AD...
September 30, 2016: Current Alzheimer Research
https://www.readbyqxmd.com/read/27677678/application-and-outcomes-of-therapy-combining-transcranial-direct-current-stimulation-and-virtual-reality-a-systematic-review
#16
Thais Massetti, Tânia Brusque Crocetta, Talita Dias da Silva, Isabela Lopes Trevizan, Claudia Arab, Fátima Aparecida Caromano, Carlos Bandeira de Mello Monteiro
PURPOSE: To evaluate the methods and major outcomes of transcranial direct current stimulation (tDCS) combined with virtual reality (VR) therapy in randomized controlled trials. METHOD: A systematic review was performed following PRISMA guidelines using PubMed, PubMed Central, Web of Science and CAPES periodic databases, with no time restriction. The studies were screened for the following inclusion criteria: human subjects, combination of VR and tDCS methods, and randomized controlled study design...
September 27, 2016: Disability and Rehabilitation. Assistive Technology
https://www.readbyqxmd.com/read/27662531/effects-of-transcranial-stimulating-electrode-montages-over-the-head-for-lower-extremity-transcranial-motor-evoked-potential-monitoring
#17
Ryosuke Tomio, Takenori Akiyama, Takayuki Ohira, Kazunari Yoshida
OBJECTIVE The aim of this study was to determine the most effective electrode montage to elicit lower-extremity transcranial motor evoked potentials (LE-tMEPs) using a minimum stimulation current. METHODS A realistic 3D head model was created from T1-weighted images. Finite element methods were used to visualize the electric field in the brain, which was generated by transcranial electrical stimulation via 4 electrode montage models. The stimulation threshold level of LE-tMEPs in 52 patients was also studied in a practical clinical setting to determine the effects of each electrode montage...
September 23, 2016: Journal of Neurosurgery
https://www.readbyqxmd.com/read/27616188/probing-the-causal-role-of-prestimulus-interregional-synchrony-for-perceptual-integration-via-tacs
#18
Rolandas Stonkus, Verena Braun, Jess R Kerlin, Gregor Volberg, Simon Hanslmayr
The phase of prestimulus oscillations at 7-10 Hz has been shown to modulate perception of briefly presented visual stimuli. Specifically, a recent combined EEG-fMRI study suggested that a prestimulus oscillation at around 7 Hz represents open and closed windows for perceptual integration by modulating connectivity between lower order occipital and higher order parietal brain regions. We here utilized brief event-related transcranial alternating current stimulation (tACS) to specifically modulate this prestimulus 7 Hz oscillation, and the synchrony between parietal and occipital brain regions...
2016: Scientific Reports
https://www.readbyqxmd.com/read/27607431/phase-and-frequency-dependent-effects-of-transcranial-alternating-current-stimulation-on-motor-cortical-excitability
#19
Hisato Nakazono, Katsuya Ogata, Tsuyoshi Kuroda, Shozo Tobimatsu
Transcranial alternating current stimulation (tACS) can entrain ongoing brain oscillations and modulate the motor system in a frequency-dependent manner. Recent animal studies have demonstrated that the phase of a sinusoidal current also has an important role in modulation of neuronal activity. However, the phase effects of tACS on the human motor system are largely unknown. Here, we systematically investigated the effects of tACS phase and frequency on the primary motor cortex (M1) by using motor evoked potentials (MEPs) with transcranial magnetic stimulation (TMS)...
2016: PloS One
https://www.readbyqxmd.com/read/27590833/prefrontal-cortex-and-impulsivity-interest-of-noninvasive-brain-stimulation
#20
REVIEW
Charlotte Brevet-Aeby, Jerome Brunelin, Sylvain Iceta, Catherine Padovan, Emmanuel Poulet
INTRODUCTION: Impulsivity has been reported in many psychiatric conditions and includes deficits in several cognitive functions such as attention, inhibitory control, risk taking, delay discounting and planning. Many studies have shown that noninvasive brain stimulation (NIBS) techniques modulate the activity of the prefrontal cortex and the functions involved in impulsivity. OBJECTIVE: This article aims to review the literature on the effect of NIBS on impulsivity in healthy subjects aged 18-65 years old, and to highlight research avenues to develop therapeutic alternatives for such disorders...
August 30, 2016: Neuroscience and Biobehavioral Reviews
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