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TDCS and connectivity

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https://www.readbyqxmd.com/read/30261367/polarity-dependent-modulation-of-multi-spectral-neuronal-activity-by-transcranial-direct-current-stimulation
#1
Alex I Wiesman, Mackenzie S Mills, Timothy J McDermott, Rachel K Spooner, Nathan M Coolidge, Tony W Wilson
The ability to preferentially deploy neural resources to the visual space is an important component of normative cognitive function, however, the population-level cortical dynamics that sub-serve this ability are not fully understood. Specifically, rhythmic activity in the occipital cortices (e.g., theta, alpha, and gamma oscillations) has been strongly implicated in this cognitive process, but these neural responses are difficult to non-invasively manipulate in a systematic manner. In this study, transcranial direct-current stimulation (tDCS) was used to modulate brain activity, while high-density magnetoencephalography (MEG) was employed to quantify changes in rhythm-specific neural activity in the occipital cortices of 57 adults performing a visuospatial processing paradigm...
September 1, 2018: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/30209517/the-neural-correlates-of-flow-experience-explored-with-transcranial-direct-current-stimulation
#2
Martin Ulrich, Johannes Niemann, Markus Boland, Thomas Kammer, Filip Niemann, Georg Grön
The experience of flow ensues when humans engage in a demanding task while task demands are balanced with the individual's level of skill or ability. Here, we further tested the hypothesis that the medial prefrontal cortex (MPFC) plays a causal role in mediating flow experience using transcranial direct current stimulation (tDCS) to interfere with MPFC's deactivation evoked by a flow paradigm and measured by magnetic resonance (MR)-based perfusion imaging. In a balanced, within-subjects repeated measure design, three treatments of tDCS (sham, anodal, cathodal) were applied in a sample of 22 healthy male participants...
September 12, 2018: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/30176001/combined-transcranial-magnetic-stimulation-and-electroencephalography-of-the-dorsolateral-prefrontal-cortex
#3
Pantelis Lioumis, Reza Zomorrodi, Itay Hadas, Zafiris J Daskalakis, Daniel M Blumberger
Transcranial magnetic stimulation (TMS) is a non-invasive method that produces neural excitation in the cortex by means of brief, time-varying magnetic field pulses. The initiation of cortical activation or its modulation depends on the background activation of the neurons of the cortical region activated, the characteristics of the coil, its position and its orientation with respect to the head. TMS combined with simultaneous electrocephalography (EEG) and neuronavigation (nTMS-EEG) allows for the assessment of cortico-cortical excitability and connectivity in almost all cortical areas in a reproducible manner...
August 17, 2018: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/30145715/increased-interhemispheric-synchrony-underlying-the-improved-athletic-performance-of-rowing-athletes-by-transcranial-direct-current-stimulation
#4
Xiaoyun Liu, Xi Yang, Zhenghua Hou, Ming Ma, Wenhao Jiang, Caiyun Wang, Yuqun Zhang, Yonggui Yuan
To explore the mechanism of transcranial direct current stimulation (tDCS) on the improved performance of professional rowing athletes. Twelve male professional rowing athletes were randomly divided into two groups (low-stimulation group, 1 mA, n = 6; high-stimulation group, 2 mA, n = 6), and they accepted tDCS for two consecutive weeks while undergoing regular training (20 min each time, five times a week, totally ten times). The assessments of depression, anxiety, executive function, fatigue perception, lactate threshold power (LTP) and isokinetic muscle strength as well as the collection of functional magnetic resonance imaging (fMRI) data were performed at baseline and at follow-up (the end of the fourth week)...
August 25, 2018: Brain Imaging and Behavior
https://www.readbyqxmd.com/read/30135258/cerebello-spinal-tdcs-in-ataxia-a-randomized-double-blind-sham-controlled-crossover-trial
#5
Alberto Benussi, Valentina Dell'Era, Valentina Cantoni, Elisa Bonetta, Roberto Grasso, Rosa Manenti, Maria Cotelli, Alessandro Padovani, Barbara Borroni
OBJECTIVE: To investigate whether a 2-week treatment with cerebellar anodal and spinal cathodal transcranial direct current stimulation (tDCS) could reduce symptoms in patients with neurodegenerative ataxia and could modulate cerebello-motor connectivity at the short and long terms. METHODS: We performed a double-blind, randomized, sham-controlled, crossover trial with cerebello-spinal tDCS (5 d/wk for 2 weeks) in 20 patients with neurodegenerative ataxia. Each patient underwent a clinical evaluation before and after real tDCS or sham stimulation...
September 18, 2018: Neurology
https://www.readbyqxmd.com/read/30072144/dry-tdcs-tolerability-of-a-novel-multilayer-hydrogel-composite-non-adhesive-electrode-for-transcranial-direct-current-stimulation
#6
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...
September 2018: Brain Stimulation
https://www.readbyqxmd.com/read/30030397/modulating-regional-motor-cortical-excitability-with-noninvasive-brain-stimulation-results-in-neurochemical-changes-in-bilateral-motor-cortices
#7
Velicia Bachtiar, Ainslie Johnstone, Adam Berrington, Clark Lemke, Heidi Johansen-Berg, Uzay Emir, Charlotte J 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. Interregional changes are particularly important in functional recovery after stroke, when critical plastic changes underpinning behavioral improvements are observed in both ipsilesional and contralesional M1s. It is increasingly understood that reduction in GABA in the contralateral M1 is necessary to allow learning of a motor task...
August 15, 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
#8
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
#9
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
#10
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
#11
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
#12
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...
September 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
#13
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
#14
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
#15
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
#16
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
#17
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...
September 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
#18
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
#19
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
#20
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
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