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TDCS and connectivity

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https://www.readbyqxmd.com/read/30072144/dry-tdcs-tolerability-of-a-novel-multilayer-hydrogel-composite-non-adhesive-electrode-for-transcranial-direct-current-stimulation
#1
Niranjan Khadka, Helen Borges, Adantchede L Zannou, Jongmin Jang, Byunggik Kim, Kiwon Lee, Marom Bikson
BACKGROUND: The adoption of transcranial Direct Current Stimulation (tDCS) is encouraged by portability and ease-of-use. However, the preparation of tDCS electrodes remains the most cumbersome and error-prone step. Here, we validate the performance of the first "dry" electrodes for tDCS. A "dry electrode" excludes 1) any saline or other electrolytes, that are prone to spread and leaving a residue; 2) any adhesive at the skin interface; or 3) any electrode preparation steps except the connection to the stimulator...
July 29, 2018: Brain Stimulation
https://www.readbyqxmd.com/read/30030397/modulating-regional-motor-cortical-excitability-with-non-invasive-brain-stimulation-results-in-neurochemical-changes-in-bilateral-motor-cortices
#2
Velicia Bachtiar, Ainslie Johnstone, Adam Berrington, Clarke Lemke, Heidi Johansen-Berg, Uzay Emir, Charlotte Stagg
Learning a novel motor skill is dependent both on regional changes within the primary motor cortex (M1) contralateral to the active hand, and also on modulation between and within anatomically-distant but functionally-connected brain regions. Inter-regional changes are particularly important in functional recovery after stroke, where critical plastic changes underpinning behavioural improvements are observed in both ipsilesional and contralesional M1s. It is increasingly understood that reduction in γ-aminobutyric acid (GABA) in the contralateral M1 is necessary to allow learning of a motor task...
July 20, 2018: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/30030198/transcranial-direct-current-stimulation-tdcs-facilitates-verb-learning-by-altering-effective-connectivity-in-the-healthy-brain
#3
Valentina Fiori, Lisa Kunz, Philipp Kuhnke, Paola Marangolo, Gesa Hartwigsen
Recent studies have shown that the left inferior frontal gyrus (IFG) plays a key role in language learning. Facilitatory stimulation over this region by means of anodal transcranial direct current stimulation (tDCS) can modulate linguistic abilities in healthy individuals and improve language performance in patients with post-stroke aphasia. Neuroimaging studies in healthy participants have suggested that anodal tDCS decreases task-related activity at the stimulated site when applied during different language tasks, and changes resting-state connectivity in a larger network of areas associated with language processing...
July 17, 2018: NeuroImage
https://www.readbyqxmd.com/read/30009127/the-effect-of-tdcs-on-functional-connectivity-in-primary-progressive-aphasia
#4
Bronte N Ficek, Zeyi Wang, Yi Zhao, Kimberly T Webster, John E Desmond, Argye E Hillis, Constantine Frangakis, Andreia Vasconcellos Faria, Brian Caffo, Kyrana Tsapkini
Transcranial direct current stimulation (tDCS) is an innovative technique recently shown to improve language outcomes even in neurodegenerative conditions such as primary progressive aphasia (PPA), but the underlying brain mechanisms are not known. The present study tested whether the additional language gains with repetitive tDCS (over sham) in PPA are caused by changes in functional connectivity between the stimulated area (the left inferior frontal gyrus (IFG)) and the rest of the language network. We scanned 24 PPA participants (11 female) before and after language intervention (written naming/spelling) with a resting-state fMRI sequence and compared changes before and after three weeks of tDCS or sham coupled with language therapy...
2018: NeuroImage: Clinical
https://www.readbyqxmd.com/read/30006770/transcranial-electrical-stimulation-tes-mechanisms-and-its-effects-on-cortical-excitability-and-connectivity
#5
REVIEW
Thomas Reed, Roi Cohen Kadosh
In this review, we describe transcranial electrical stimulation (tES) techniques currently being used in neuroscientific research, including transcranial direct current (tDCS), alternating current (tACS) and random noise (tRNS) stimulation techniques. We explain how these techniques are used and summarise the proposed mechanisms of action for each technique. We continue by describing how each method has been used to alter endogenous neuronal oscillations and connectivity between brain regions, and we conclude by highlighting the varying effects of stimulation and discussing the future direction of these stimulation techniques in research...
July 13, 2018: Journal of Inherited Metabolic Disease
https://www.readbyqxmd.com/read/29974333/prefrontal-tdcs-attenuates-medial-prefrontal-connectivity-upon-being-criticized-in-individuals-scoring-high-on-perceived-criticism
#6
Josefien Dedoncker, Marie-Anne Vanderhasselt, Jonathan Remue, Sara De Witte, Guo-Rong Wu, Jill M Hooley, Rudi De Raedt, Chris Baeken
The mechanisms by which transcranial direct current stimulation (tDCS) influences emotional processing - and whether this is related to individual vulnerability for psychopathology - are still poorly understood. The present study aimed to investigate if one prefrontal tDCS session modulates mood and neural functional connectivity after being exposed to negative information differently in individuals low or high in perceived criticism (PC), which has been related to vulnerability for psychiatric illness. In a randomized cross-over design, one session of MRI-compatible prefrontal tDCS (neuronavigated placement of the anodal electrode at the left dorsolateral prefrontal cortex and the cathodal electrode at the right supraorbital region; vs...
July 4, 2018: Brain Imaging and Behavior
https://www.readbyqxmd.com/read/29929771/anodal-transcranial-direct-current-stimulation-affects-auditory-cortex-plasticity-in-normal-hearing-and-noise-exposed-rats
#7
Fabiola Paciello, Maria Vittoria Podda, Rolando Rolesi, Sara Cocco, Laura Petrosini, Diana Troiani, Anna Rita Fetoni, Gaetano Paludetti, Claudio Grassi
BACKGROUND: Transcranial direct current stimulation (tDCS) is a non-invasive tool capable to modulate cortical functions by affecting neuronal excitability and synaptic plasticity. OBJECTIVE: Here we investigated the effects of anodal tDCS on auditory cortex (ACx) in normal-hearing rats and following a paradigm of noise-induced hearing loss (NIHL), that causes morphological alterations in ACx pyramidal neurons. METHODS: Male rats exposed to intense pure tone (10 kHz) were subsequently subjected to unilateral anodal tDCS of ACx and changes in dendritic morphology and spines were assessed by Golgi-Cox staining 30 days after the onset of the acoustic trauma...
May 31, 2018: Brain Stimulation
https://www.readbyqxmd.com/read/29867330/tracking-the-effect-of-cathodal-transcranial-direct-current-stimulation-on-cortical-excitability-and-connectivity-by-means-of-tms-eeg
#8
Erica Varoli, Alberto Pisoni, Giulia C Mattavelli, Alessandra Vergallito, Alessia Gallucci, Lilia D Mauro, Mario Rosanova, Nadia Bolognini, Giuseppe Vallar, Leonor J Romero Lauro
Transcranial direct current stimulation (tDCS) is increasingly used in both research and therapeutic settings, but its precise mechanisms remain largely unknown. At a neuronal level, tDCS modulates cortical excitability by shifting the resting membrane potential in a polarity-dependent way: anodal stimulation increases the spontaneous firing rate, while cathodal decreases it. However, the neurophysiological underpinnings of anodal/cathodal tDCS seem to be different, as well as their behavioral effect, in particular when high order areas are involved, compared to when motor or sensory brain areas are targeted...
2018: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/29782510/individual-differences-in-learning-correlate-with-modulation-of-brain-activity-induced-by-transcranial-direct-current-stimulation
#9
Brian Falcone, Atsushi Wada, Raja Parasuraman, Daniel E Callan
Transcranial direct current stimulation (tDCS) has been shown to enhance cognitive performance on a variety of tasks. It is hypothesized that tDCS enhances performance by affecting task related cortical excitability changes in networks underlying or connected to the site of stimulation facilitating long term potentiation. However, many recent studies have called into question the reliability and efficacy of tDCS to induce modulatory changes in brain activity. In this study, our goal is to investigate the individual differences in tDCS induced modulatory effects on brain activity related to the degree of enhancement in performance, providing insight into this lack of reliability...
2018: PloS One
https://www.readbyqxmd.com/read/29763453/anisotropic-conductivity-tensor-imaging-for-transcranial-direct-current-stimulation-tdcs-using-magnetic-resonance-diffusion-tensor-imaging-mr-dti
#10
Mun Bae Lee, Hyung Joong Kim, Eung Je Woo, Oh In Kwon
Transcranial direct current stimulation (tDCS) is a widely used non-invasive brain stimulation technique by applying low-frequency weak direct current via electrodes attached on the head. The tDCS using a fixed current between 1 and 2 mA has relied on computational modelings to achieve optimal stimulation effects. Recently, by measuring the tDCS current induced magnetic field using an MRI scanner, the internal current pathway has been successfully recovered. However, up to now, there is no technique to visualize electrical properties including the electrical anisotropic conductivity, effective extracellular ion-concentration, and electric field using only the tDCS current in-vivo...
2018: PloS One
https://www.readbyqxmd.com/read/29762886/automatic-m1-so-montage-headgear-for-transcranial-direct-current-stimulation-tdcs-suitable-for-home-and-high-throughput-in-clinic-applications
#11
Helena Knotkova, Alexa Riggs, Destiny Berisha, Helen Borges, Henry Bernstein, Vaishali Patel, Dennis Q Truong, Gozde Unal, Denis Arce, Abhishek Datta, Marom Bikson
OBJECTIVES: Non-invasive transcranial direct current stimulation (tDCS) over the motor cortex is broadly investigated to modulate functional outcomes such as motor function, sleep characteristics, or pain. The most common montages that use two large electrodes (25-35 cm2 ) placed over the area of motor cortex and contralateral supraorbital region (M1-SO montages) require precise measurements, usually using the 10-20 EEG system, which is cumbersome in clinics and not suitable for applications by patients at home...
May 15, 2018: Neuromodulation: Journal of the International Neuromodulation Society
https://www.readbyqxmd.com/read/29759944/testing-assumptions-on-prefrontal-transcranial-direct-current-stimulation-comparison-of-electrode-montages-using-multimodal-fmri
#12
Jana Wörsching, Frank Padberg, Stephan Goerigk, Irmgard Heinz, Christine Bauer, Christian Plewnia, Alkomiet Hasan, Birgit Ertl-Wagner, Daniel Keeser
BACKGROUND: Transcranial direct current stimulation (tDCS) of the prefrontal cortex (PFC) has been widely applied in cognitive neurosciences and advocated as a therapeutic intervention, e.g. in major depressive disorder. Although several targets and protocols have been suggested, comparative studies of tDCS parameters, particularly electrode montages and their cortical targets, are still lacking. OBJECTIVE: This study investigated a priori hypotheses on specific effects of prefrontal-tDCS montages by using multimodal functional magnetic resonance imaging (fMRI) in healthy participants...
May 4, 2018: Brain Stimulation
https://www.readbyqxmd.com/read/29750977/high-definition-transcranial-direct-current-stimulation-changes-older-adults-subjective-sleep-and-corresponding-resting-state-functional-connectivity
#13
Jing Sheng, Chao Xie, Dong-Qiong Fan, Xu Lei, Jing Yu
With advanced age, older adults show functional deterioration in sleep. Transcranial direct current stimulation (tDCS), a noninvasive brain stimulation, modulates individuals' behavioral performance in various cognitive domains. However, the modulation effect and neural mechanisms of tDCS on sleep, especially for the elderly population are not clear. Here, we aimed to investigate whether high-definition transcranial direct current stimulation (HD-tDCS) could modulate community-dwelling older adults' subjective sleep and whether these potential improvements are associated with the large-scale brain activity alterations recorded by functional magnetic resonance imaging...
July 2018: International Journal of Psychophysiology
https://www.readbyqxmd.com/read/29741803/modulating-emotional-experience-using-electrical-stimulation-of-the-medial-prefrontal-cortex-a-preliminary-tdcs-fmri-study
#14
Rany Abend, Roy Sar-El, Tal Gonen, Itamar Jalon, Sharon Vaisvaser, Yair Bar-Haim, Talma Hendler
OBJECTIVES: Implicit regulation of emotions involves medial-prefrontal cortex (mPFC) regions exerting regulatory control over limbic structures. Diminished regulation relates to aberrant mPFC functionality and psychopathology. Establishing means of modulating mPFC functionality could benefit research on emotion and its dysregulation. Here, we tested the capacity of transcranial direct current stimulation (tDCS) targeting mPFC to modulate subjective emotional states by facilitating implicit emotion regulation...
May 9, 2018: Neuromodulation: Journal of the International Neuromodulation Society
https://www.readbyqxmd.com/read/29706876/changing-brain-networks-through-non-invasive-neuromodulation
#15
REVIEW
Wing Ting To, Dirk De Ridder, John Hart, Sven Vanneste
Background/Objective : Non-invasive neuromodulation techniques, such as repetitive Transcranial Magnetic Stimulation (rTMS) and transcranial Direct Current Stimulation (tDCS), have increasingly been investigated for their potential as treatments for neurological and psychiatric disorders. Despite widespread dissemination of these techniques, the underlying therapeutic mechanisms and the ideal stimulation site for a given disorder remain unknown. Increasing evidence support the possibility of non-invasive neuromodulation affecting a brain network rather than just the local stimulation target...
2018: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/29688392/challenge-to-unity-relationship-between-hemispheric-asymmetry-of-the-default-mode-network-and-mind-wandering
#16
Shogo Kajimura, Takanori Kochiyama, Nobuhito Abe, Michio Nomura
The default mode network (DMN) is considered a unified core brain function for generating subjective mental experiences, such as mind wandering. We propose a novel cognitive framework for understanding the unity of the DMN from the perspective of hemispheric asymmetry. Using transcranial direct current stimulation (tDCS), effective connectivity estimation, and machine learning, we show that the bilateral angular gyri (AG), which are core regions of the DMN, exhibit heterogeneity in both inherent network organization and mind wandering regulation...
April 21, 2018: Cerebral Cortex
https://www.readbyqxmd.com/read/29688276/frontal-transcranial-direct-current-stimulation-induces-dopamine-release-in-the-ventral-striatum-in-human
#17
Clara Fonteneau, Jérome Redoute, Frédéric Haesebaert, Didier Le Bars, Nicolas Costes, Marie-Françoise Suaud-Chagny, Jérome Brunelin
A single transcranial direct current stimulation (tDCS) session applied over the dorsolateral prefrontal cortex (DLFPC) can be associated with procognitive effects. Furthermore, repeated DLPFC tDCS sessions are under investigation as a new therapeutic tool for a range of neuropsychiatric conditions. A possible mechanism explaining such beneficial effects is a modulation of meso-cortico-limbic dopamine transmission. We explored the spatial and temporal neurobiological effects of bifrontal tDCS on subcortical dopamine transmission during and immediately after the stimulation...
July 1, 2018: Cerebral Cortex
https://www.readbyqxmd.com/read/29666636/modulating-brain-connectivity-by-simultaneous-dual-mode-stimulation-over-bilateral-primary-motor-cortices-in-subacute-stroke-patients
#18
Jungsoo Lee, Eunhee Park, Ahee Lee, Won Hyuk Chang, Dae-Shik Kim, Yong-Il Shin, Yun-Hee Kim
Repetitive transcranial magnetic stimulation (rTMS) or transcranial direct current stimulation (tDCS) has been used for the modulation of stroke patients' motor function. Recently, more challenging approaches have been studied. In this study, simultaneous stimulation using both rTMS and tDCS (dual-mode stimulation) over bilateral primary motor cortices (M1s) was investigated to compare its modulatory effects with single rTMS stimulation over the ipsilesional M1 in subacute stroke patients. Twenty-four patients participated; 12 participants were assigned to the dual-mode stimulation group while the other 12 participants were assigned to the rTMS-only group...
2018: Neural Plasticity
https://www.readbyqxmd.com/read/29625120/impact-of-transcranial-direct-current-stimulation-on-somatosensory-transfer-learning-when-the-secondary-somatosensory-cortex-comes-into-play
#19
Raphael Hirtz, Thomas Weiss, Ralph Huonker, Otto W Witte
Transfer learning is an immanent feature of perceptual learning. Yet, despite the increasingly widespread application of transcranial direct current stimulation (tDCS) to study learning, transfer effects in response to tDCS have not been studied. Therefore, the present study investigated the transfer of tactile acuity evoked by repeatedly applied anodal tDCS over the left primary somatosensory cortex (S1) over the course of five days from the dominant (right) to the non-dominant (left) index finger (IF). There was a complete transfer of improvement of the right IF to its contralateral homologue by follow-up four weeks later...
June 15, 2018: Brain Research
https://www.readbyqxmd.com/read/29593782/bilateral-transcranial-direct-current-stimulation-reshapes-resting-state-brain-networks-a-magnetoencephalography-assessment
#20
Giovanni Pellegrino, Matteo Maran, Cristina Turco, Luca Weis, Giovanni Di Pino, Francesco Piccione, Giorgio Arcara
Transcranial direct current stimulation (tDCS) can noninvasively induce brain plasticity, and it is potentially useful to treat patients affected by neurological conditions. However, little is known about tDCS effects on resting-state brain networks, which are largely involved in brain physiological functions and in diseases. In this randomized, sham-controlled, double-blind study on healthy subjects, we have assessed the effect of bilateral tDCS applied over the sensorimotor cortices on brain and network activity using a whole-head magnetoencephalography system...
2018: Neural Plasticity
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