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Transcranial alternating current stimulation

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https://www.readbyqxmd.com/read/28385876/concurrent-tacs-fmri-reveals-causal-influence-of-power-synchronized-neural-activity-on-resting-state-fmri-connectivity
#1
Marc Bächinger, Valerio Zerbi, Marius Moisa, Rafael Polania, Quanying Liu, Dante Mantini, Christian Ruff, Nicole Wenderoth
Resting state fMRI (rs-fMRI) is commonly used to study the brain's intrinsic neural coupling, which reveals specific spatiotemporal patterns in the form of resting state networks (RSN). It has been hypothesized that slow rs-fMRI oscillations (<0.1 Hz) are driven by underlying electrophysiological rhythms that typically occur at much faster timescales (>5 Hz); however, causal evidence for this relationship is currently lacking. Here we measured rs-fMRI in humans while applying transcranial alternating current stimulation (tACS) to entrain brain rhythms in left and right sensorimotor cortices...
April 6, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28385634/phonological-facilitation-in-picture-naming-when-and-where-a-tdcs-study
#2
Alberto Pisoni, Milena Cerciello, Zaira Cattaneo, Costanza Papagno
Phonological facilitation (PF) refers to a reduction of naming latencies when a phonologically related word is presented concurrently with the target picture, as compared to the presentation of phonologically unrelated words. According to spread of activation models of word production, this effect arises after lexical selection, during phonetic encoding, and is due to the co-activation of the phonemes shared by the target word and the distracter. Conversely, semantic interference (SI) is characterized by longer naming latencies when semantically related distracters are concurrently presented with the target picture...
April 4, 2017: Neuroscience
https://www.readbyqxmd.com/read/28373927/non-invasive-brain-stimulation-for-essential-tremor
#3
REVIEW
Ludy C Shih, Alvaro Pascual-Leone
BACKGROUND: There is increasing interest in the use of non-invasive brain stimulation to characterize and potentially treat essential tremor (ET). Studies have used a variety of stimulation coils, paradigms, and target locations to make these observations. We reviewed the literature to compare prior studies and to evaluate the rationale and the methods used in these studies. METHODS: We performed a systematic literature search of the PubMed database using the terms "transcranial," "noninvasive," "brain stimulation," "transcranial magnetic stimulation (TMS)," "transcranial direct current stimulation (tDCS)," "transcranial alternating current stimulation (tACS)," and "essential tremor...
2017: Tremor and Other Hyperkinetic Movements
https://www.readbyqxmd.com/read/28371170/state-of-the-art-novel-applications-for-cortical-stimulation
#4
REVIEW
Dirk De Ridder, Sanjaya Perera, Sven Vanneste
OBJECTIVE: Electrical stimulation via implanted electrodes that overlie the cortex of the brain is an upcoming neurosurgical technique that was hindered for a long time by insufficient knowledge of how the brain functions in a dynamic, physiological, and pathological way, as well as by technological limitations of the implantable stimulation devices. METHODS: This paper provides an overview of cortex stimulation via implantable devices and introduces future possibilities to improve cortex stimulation...
March 28, 2017: Neuromodulation: Journal of the International Neuromodulation Society
https://www.readbyqxmd.com/read/28348136/driving-human-motor-cortical-oscillations-leads-to-behaviourally-relevant-changes-in-local-gabaa-inhibition-a-tacs-tms-study
#5
Magdalena Nowak, Emily Hinson, Freek van Ede, Alek Pogosyan, Andrea Guerra, Andrew Quinn, Peter Brown, Charlotte J Stagg
Beta and gamma oscillations are the dominant oscillatory activity in the human motor cortex (M1). However, their physiological basis and precise functional significance remain poorly understood. Here, we employed Transcranial Magnetic Stimulation (TMS) to examine the physiological basis and behavioural relevance of driving beta and gamma oscillatory activity in the human M1 using transcranial alternating current stimulation (tACS). tACS was applied using a sham-controlled cross-over design at individualised intensity for 20 min, and TMS was performed at rest (before, during and after tACS) and during movement preparation (before and after tACS)...
March 27, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28323009/investigation-of-the-effects-of-transcranial-alternating-current-stimulation-tacs-on-self-paced-rhythmic-movements
#6
Manuel Varlet, Alanna Wade, Giacomo Novembre, Peter E Keller
Human rhythmic movements spontaneously entrain to external rhythmic stimuli. Such sensory-motor entrainment can attract movements to different tempi and enhance their efficiency, with potential clinical applications for motor rehabilitation. Here we investigate whether entrainment of self-paced rhythmic movements can be induced via transcranial alternating current stimulation (tACS), which uses alternating currents to entrain spontaneous brain oscillations at specific frequencies. Participants swung a handheld pendulum at their preferred tempo with the right hand while tACS was applied over their left or right primary motor cortex at frequencies equal to their preferred tempo (Experiment 1) or in the alpha (10Hz) and beta (20Hz) ranges (Experiment 2)...
March 18, 2017: Neuroscience
https://www.readbyqxmd.com/read/28322886/high-gamma-oscillations-in-the-motor-cortex-during-visuo-motor-coordination-a-tacs-interferential-study
#7
E Santarnecchi, A Biasella, E Tatti, A Rossi, D Prattichizzo, S Rossi
BACKGROUND: While the role of beta (∼20Hz), theta (∼5Hz) and alpha (∼10Hz) oscillations in the motor areas have been repeatedly associated with defined properties of motor performance, the investigation of gamma (∼40-90Hz) oscillatory activity is a more recent and still not fully understood component of motor control physiology, despite its potential clinical relevance for motor disorders. OBJECTIVE/HYPOTHESIS: We have implemented an online neuromodulation paradigm based on transcranial alternating current stimulation (tACS) of the dominant motor cortex during a visuo-motor coordination task...
March 18, 2017: Brain Research Bulletin
https://www.readbyqxmd.com/read/28288700/externally-induced-frontoparietal-synchronization-modulates-network-dynamics-and-enhances-working-memory-performance
#8
Ines R Violante, Lucia M Li, David W Carmichael, Romy Lorenz, Robert Leech, Adam Hampshire, John C Rothwell, David J Sharp
Cognitive functions such as working memory (WM) are emergent properties of large-scale network interactions. Synchronisation of oscillatory activity might contribute to WM by enabling the coordination of long-range processes. However, causal evidence for the way oscillatory activity shapes network dynamics and behavior in humans is limited. Here we applied transcranial alternating current stimulation (tACS) to exogenously modulate oscillatory activity in a right frontoparietal network that supports WM. Externally induced synchronization improved performance when cognitive demands were high...
March 14, 2017: ELife
https://www.readbyqxmd.com/read/28269179/projected-current-density-comparison-in-tdcs-block-and-smooth-fe-modeling
#9
Aprinda Indahlastari, Munish Chauhan, Rosalind J Sadleir
Current density distribution and projected current density calculation following transcranial direct current stimulation (tDCS) forward model in a human head were compared between two modeling pipelines: block and smooth. Block model was directly constructed from MRI voxel resolution and simulated in C. Smooth models underwent a boundary smoothing process by applying recursive Gaussian filters and simulated in COMSOL. Three smoothing levels were added to determine their effects on current density distribution compared to block models...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28266930/open-ephys-electroencephalography-open-ephys%C3%A2-%C3%A2-%C3%A2-%C3%A2-eeg-a-modular-low-cost-open-source-solution-to-human-neural-recording
#10
Christopher Black, Jakob Voigts, Uday Agrawal, Max Ladow, Juan Santoyo, Christopher Moore, Stephanie Jones
OBJECTIVE: Electroencephalography (EEG) offers a unique opportunity to study human neural activity non-invasively with millisecond resolution using minimal equipment in or outside of a lab setting. EEG can be combined with a number of techniques for closed-loop experiments, where external devices are driven by specific neural signals. However, reliable, commercially available EEG systems are expensive, often making them impractical for individual use and research development. Moreover, by design, a majority of these systems cannot be easily altered to the specification needed by the end user...
March 7, 2017: Journal of Neural Engineering
https://www.readbyqxmd.com/read/28250567/feasibility-of-online-neuromodulation-using-transcranial-alternating-current-stimulation-in-schizophrenia
#11
Vanteemar S Sreeraj, Vandita Shanbhag, Hema Nawani, Venkataram Shivakumar, Dinakaran Damodharan, Anushree Bose, Janardhanan C Narayanaswamy, Ganesan Venkatasubramanian
Abnormalities in resting and event-related brain oscillations are known to be associated with cognitive deficits in schizophrenia. Transcranial alternating current stimulation (tACS) modulates these rhythms across the neuronal circuits and could have a potential therapeutic role in psychiatric disorders. In this report, we describe, for the first time, application of online tACS in a schizophrenia patient with working memory deficits. This case report supports the feasibility and potential utility of online tACS in schizophrenia, which needs further systematic research...
January 2017: Indian Journal of Psychological Medicine
https://www.readbyqxmd.com/read/28228580/probing-phase-and-frequency-dependent-characteristics-of-cortical-neurons-using-combined-transcranial-alternating-current-stimulation-and-transcranial-magnetic
#12
Sara Jeanne Hussain, Nivethida Thirugnanasambandam
Paired-pulse transcranial magnetic stimulation (TMS) and peripheral stimulation combined with TMS can be used to study cortical interneuronal circuitry. By combining these procedures with concurrent transcranial alternating current stimulation (tACS), Guerra and colleagues recently showed that different cortical interneuronal populations are differentially modulated by the phase and frequency of tACS-imposed oscillations (Guerra et al. 2016, Phase dependency of the human primary motor cortex and cholinergic inhibition cancellation during beta tACS, Cerebral Cortex 26:3977-2990)...
February 22, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28227409/projected-current-density-comparison-in-tdcs-block-and-smooth-fe-modeling
#13
Aprinda Indahlastari, Munish Chauhan, Rosalind J Sadleir, Aprinda Indahlastari, Munish Chauhan, Rosalind J Sadleir, Aprinda Indahlastari, Munish Chauhan, Rosalind J Sadleir
Current density distribution and projected current density calculation following transcranial direct current stimulation (tDCS) forward model in a human head were compared between two modeling pipelines: block and smooth. Block model was directly constructed from MRI voxel resolution and simulated in C. Smooth models underwent a boundary smoothing process by applying recursive Gaussian filters and simulated in COMSOL. Three smoothing levels were added to determine their effects on current density distribution compared to block models...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28217104/priming-neural-circuits-to-modulate-spinal-reflex-excitability
#14
Stephen P Estes, Jennifer A Iddings, Edelle C Field-Fote
While priming is most often thought of as a strategy for modulating neural excitability to facilitate voluntary motor control, priming stimulation can also be utilized to target spinal reflex excitability. In this application, priming can be used to modulate the involuntary motor output that often follows central nervous system injury. Individuals with spinal cord injury (SCI) often experience spasticity, for which antispasmodic medications are the most common treatment. Physical therapeutic/electroceutic interventions offer an alternative treatment for spasticity, without the deleterious side effects that can accompany pharmacological interventions...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28203084/use-of-transcranial-direct-current-stimulation-for-the-treatment-of-auditory-hallucinations-of-schizophrenia-a-systematic-review
#15
REVIEW
Pedro H Pondé, Eduardo P de Sena, Joan A Camprodon, Arão Nogueira de Araújo, Mário F Neto, Melany DiBiasi, Abrahão Fontes Baptista, Lidia Mvr Moura, Camila Cosmo
INTRODUCTION: Auditory hallucinations are defined as experiences of auditory perceptions in the absence of a provoking external stimulus. They are the most prevalent symptoms of schizophrenia with high capacity for chronicity and refractoriness during the course of disease. The transcranial direct current stimulation (tDCS) - a safe, portable, and inexpensive neuromodulation technique - has emerged as a promising treatment for the management of auditory hallucinations. OBJECTIVE: The aim of this study is to analyze the level of evidence in the literature available for the use of tDCS as a treatment for auditory hallucinations in schizophrenia...
2017: Neuropsychiatric Disease and Treatment
https://www.readbyqxmd.com/read/28197084/transcranial-alternating-current-stimulation-tacs-enhances-mental-rotation-performance-during-and-after-stimulation
#16
Florian H Kasten, Christoph S Herrmann
Transcranial alternating current stimulation (tACS) has been repeatedly demonstrated to modulate endogenous brain oscillations in a frequency specific manner. Thus, it is a promising tool to uncover causal relationships between brain oscillations and behavior or perception. While tACS has been shown to elicit a physiological aftereffect for up to 70 min, it remains unclear whether the effect can still be elicited if subjects perform a complex task interacting with the stimulated frequency band. In addition, it has not yet been investigated whether the aftereffect is behaviorally relevant...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28159637/transcranial-magnetic-stimulation-tms-responses-elicited-in-hindlimb-muscles-as-an-assessment-of-synaptic-plasticity-in-spino-muscular-circuitry-after-chronic-spinal-cord-injury
#17
Hayk A Petrosyan, Valentina Alessi, Sue A Sisto, Mark Kaufman, Victor L Arvanian
Electromagnetic stimulation applied at the cranial level, i.e. transcranial magnetic stimulation (TMS), is a technique for stimulation and neuromodulation used for diagnostic and therapeutic applications in clinical and research settings. Although recordings of TMS elicited motor-evoked potentials (MEP) are an essential diagnostic tool for spinal cord injured (SCI) patients, they are reliably recorded from arm, and not leg muscles. Mid-thoracic contusion is a common SCI that results in locomotor impairments predominantly in legs...
March 6, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/28137971/transcranial-alternating-current-stimulation-attenuates-neuronal-adaptation
#18
Kohitij Kar, Jacob Duijnhouwer, Bart Krekelberg
We previously showed that brief application of 2 mA (peak-to-peak) transcranial currents alternating at 10 Hz significantly reduces motion adaptation in humans. This is but one of many behavioral studies showing that weak currents applied to the scalp modulate neural processing. Transcranial stimulation has been shown to improve perception, learning, and a range of clinical symptoms. Few studies, however, have measured the neural consequences of transcranial current stimulation. We capitalized on the strong link between motion perception and neural activity in the middle temporal (MT) area of the macaque monkey to study the neural mechanisms that underlie the behavioral consequences of transcranial alternating current stimulation...
March 1, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28119510/interpersonal-synchrony-enhanced-through-20-hz-phase-coupled-dual-brain-stimulation
#19
Giacomo Novembre, Günther Knoblich, Laura Dunne, Peter E Keller
Synchronous movement is a key component of social behaviour in several species including humans. Recent theories have suggested a link between interpersonal synchrony of brain oscillations and interpersonal movement synchrony. The present study investigated this link. Using transcranial alternating current stimulation (tACS) applied over the left motor cortex, we induced beta band (20 Hz) oscillations in pairs of individuals who both performed a finger-tapping task with the right hand. In-phase or anti-phase oscillations were delivered during a preparatory period prior to movement and while the tapping task was performed...
January 24, 2017: Social Cognitive and Affective Neuroscience
https://www.readbyqxmd.com/read/28064346/effects-of-cerebellar-transcranial-alternating-current-stimulation-on-motor-cortex-excitability-and-motor-function
#20
Antonino Naro, Alessia Bramanti, Antonino Leo, Alfredo Manuli, Francesca Sciarrone, Margherita Russo, Placido Bramanti, Rocco Salvatore Calabrò
The cerebellum regulates several motor functions through two main mechanisms, the cerebellum-brain inhibition (CBI) and the motor surround inhibition (MSI). Although the exact cerebellar structures and functions involved in such processes are partially known, Purkinje cells (PC) and their surrounding interneuronal networks may play a pivotal role concerning CBI and MSI. Cerebellar transcranial alternating current stimulation (tACS) has been proven to shape specific cerebellar components in a feasible, safe, effective, and non-invasive manner...
January 7, 2017: Brain Structure & Function
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