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Transcranial magnetic stimulation, TMS

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https://www.readbyqxmd.com/read/28640923/how-much-detail-is-needed-in-modeling-a-transcranial-magnetic-stimulation-figure-8-coil-measurements-and-brain-simulations
#1
Petar I Petrov, Stefano Mandija, Iris E C Sommer, Cornelis A T van den Berg, Sebastiaan F W Neggers
BACKGROUND: Despite TMS wide adoption, its spatial and temporal patterns of neuronal effects are not well understood. Although progress has been made in predicting induced currents in the brain using realistic finite element models (FEM), there is little consensus on how a magnetic field of a typical TMS coil should be modeled. Empirical validation of such models is limited and subject to several limitations. METHODS: We evaluate and empirically validate models of a figure-of-eight TMS coil that are commonly used in published modeling studies, of increasing complexity: simple circular coil model; coil with in-plane spiral winding turns; and finally one with stacked spiral winding turns...
2017: PloS One
https://www.readbyqxmd.com/read/28635523/long-term-paired-associative-stimulation-enhances-motor-output-of-the-tetraplegic-hand
#2
Aleksandra Tolmacheva, Sarianna Savolainen, Erika Kirveskari, Pantelis Lioumis, Linda Kuusela, Nina Maria Brandstack, Aarne Ylinen, Jyrki Mäkelä, Anastasia Shulga
A large proportion of spinal cord injuries are incomplete. Even in clinically complete injuries, silent nonfunctional connections can be present. Therapeutic approaches that can strengthen transmission in weak neural connections to improve motor performance are needed. Our aim was to determine whether long-term delivery of paired associative stimulation (PAS, a combination of transcranial magnetic stimulation (TMS) with peripheral nerve stimulation (PNS)) can enhance motor output in the hands of patients with chronic traumatic tetraplegia, and to compare this technique with long-term PNS...
June 21, 2017: Journal of Neurotrauma
https://www.readbyqxmd.com/read/28629874/neural-activity-during-attentional-conflict-predicts-reduction-in-tinnitus-perception-following-rtms
#3
G A James, J D Thostenson, G Brown, G Carter, H Hayes, S P Tripathi, D J Dobry, R B Govindan, J L Dornhoffer, D K Williams, C D Kilts, M S Mennemeier
BACKGROUND: Subjective idiopathic tinnitus is an intrusive, distracting, and potentially disabling disorder characterized by phantom perception of sounds. Although tinnitus has no approved pharmacologic treatment, recent evidence supports the use of repetitive transcranial magnetic stimulation (rTMS) to alleviate tinnitus symptoms. OBJECTIVE/HYPOTHESIS: Repetitive TMS delivered over the middle superior temporal gyrus (STG) may alter ratings of tinnitus awareness and annoyance more than loudness due to change in attentional processing...
June 2, 2017: Brain Stimulation
https://www.readbyqxmd.com/read/28627417/regulation-of-primary-motor-cortex-excitability-by-repetitive-passive-finger-movement-frequency
#4
Ryoki Sasaki, Masaki Nakagawa, Shota Tsuiki, Shota Miyaguchi, Sho Kojima, Kei Saito, Yasuto Inukai, Mitsuhiro Masaki, Naofumi Otsuru, Hideaki Onishi
Somatosensory input induced by passive movement activates primary motor cortex (M1). We applied repetitive passive movement (RPM) of different frequencies to test if modulation of M1 excitability depends on RPM frequency. Twenty-seven healthy subjects participated in this study. Motor-evoked potentials (MEPs) elicited by transcranial magnetic stimulation (TMS) to left M1 were recorded from the right first dorsal interosseous muscle (FDI) to assess corticospinal excitability (experiment 1: n=15), and F-waves were measured from the right FDI as an index of spinal motoneuron excitability (experiment 2: n=15)...
June 14, 2017: Neuroscience
https://www.readbyqxmd.com/read/28625209/involvement-of-the-left-supramarginal-gyrus-in-manipulation-judgment-tasks-contributions-to-theories-of-tool-use
#5
Mathieu Lesourd, François Osiurak, Jordan Navarro, Emanuelle Reynaud
OBJECTIVES: Two theories of tool use, namely the gesture engram and the technical reasoning theories, make distinct predictions about the involvement of the left inferior parietal lobe (IPL) in manipulation judgement tasks. The objective here is to test these alternative predictions based on previous studies on manipulation judgment tasks using transcranial magnetic stimulations (TMS) targeting the left supramarginal gyrus (SMG). METHODS: We review recent TMS studies on manipulation judgement tasks and confront these data with predictions made by both tool use theories...
June 19, 2017: Journal of the International Neuropsychological Society: JINS
https://www.readbyqxmd.com/read/28624571/age-related-changes-of-cortical-excitability-and-connectivityin-healthy-humans-non-invasive-evaluation-of-sensorimotor-network-by-means-of-tms-eeg
#6
Florinda Ferreri, Andrea Guerra, Luca Vollero, David Ponzo, Sara Maatta, Esa Mervaala, Giulio Iannello, Vincenzo Di Lazzaro
The sensorimotor cortical system undergoes structural and functional changes across its lifespan. Some of these changes are physiological and parallel the normal aging process, while others might represent pathophysiological mechanisms underlying neurodegenerative disorders. In the last years, the study of possible age-related modifications in brain sensorimotor functional characteristics has been the focus of several research projects. Here we have used the transcranial magnetic stimulation (TMS)-EEG navigated co-registration to investigate the influence of physiological aging on the excitability and connectivity of the human sensorimotor cortical system...
June 14, 2017: Neuroscience
https://www.readbyqxmd.com/read/28624492/cortical-function-and-corticomotoneuronal-adaptation-in-monomelic-amyotrophy
#7
José Manuel Matamala, Nimeshan Geevasinga, William Huynh, Thanuja Dharmadasa, James Howells, Neil G Simon, Parvathi Menon, Steve Vucic, Matthew C Kiernan
OBJECTIVE: To evaluate corticomotoneuronal integrity in monomelic amyotrophy using threshold tracking transcranial magnetic stimulation (TT-TMS). METHODS: Cortical excitability studies were prospectively performed in 8 monomelic amyotrophy patients and compared to 21 early-onset amyotrophic lateral sclerosis (ALS) patients and 40 healthy controls. Motor evoked potentials responses were recorded over abductor pollicis brevis. RESULTS: Maximal motor evoked potential (MEP/CMAP ratio) was significantly increased in monomelic amyotrophy compared with controls (monomelic amyotrophy 51...
May 17, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28615339/interhemispheric-interactions-between-trunk-muscle-representations-of-the-primary-motor-cortex
#8
Loyda Jean-Charles, Jean-François Nepveu, Joan E Deffeyes, Guillaume Elgbeili, Numa Dancause, Dorothy Barthélemy
Unilateral arm movements require trunk stabilization through bilateral contraction of axial muscles. Interhemispheric interactions between primary motor cortices (M1) could enable such coordinated contractions but these mechanisms are largely unknown. Using transcranial magnetic stimulation (TMS), we characterized interhemispheric interactions between M1 representations of the trunk stabilizing muscle erector spinae at 1(st) lumbar vertebra (ES L1) during a right isometric shoulder flexion. These interactions were compared to those of Anterior Deltoid (AD), the main agonist in this task, and the first dorsal interosseous (FDI)...
June 14, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28615277/alterations-in-the-brain-s-connectome-during-recovery-from-severe-traumatic-brain-injury-protocol-for-a-longitudinal-prospective-study
#9
Virginia Conde, Sara Hesby Andreasen, Tue Hvass Petersen, Karen Busted Larsen, Karine Madsen, Kasper Winther Andersen, Irina Akopian, Kristoffer Hougaard Madsen, Christian Pilebæk Hansen, Ingrid Poulsen, Lars Peter Kammersgaard, Hartwig Roman Siebner
INTRODUCTION: Traumatic brain injury (TBI) is considered one of the most pervasive causes of disability in people under the age of 45. TBI often results in disorders of consciousness, and clinical assessment of the state of consciousness in these patients is challenging due to the lack of behavioural responsiveness. Functional neuroimaging offers a means to assess these patients without the need for behavioural signs, indicating that brain connectivity plays a major role in consciousness emergence and maintenance...
June 14, 2017: BMJ Open
https://www.readbyqxmd.com/read/28613974/inhibition-of-lateral-prefrontal-cortex-produces-emotionally-biased-first-impressions-a-transcranial-magnetic-stimulation-and-electroencephalography-study
#10
Regina C Lapate, Jason Samaha, Bas Rokers, Hamdi Hamzah, Bradley R Postle, Richard J Davidson
Optimal functioning in everyday life requires the ability to override reflexive emotional responses and prevent affective spillover to situations or people unrelated to the source of emotion. In the current study, we investigated whether the lateral prefrontal cortex (lPFC) causally regulates the influence of emotional information on subsequent judgments. We disrupted left lPFC function using transcranial magnetic stimulation (TMS) and recorded electroencephalography (EEG) before and after. Subjects evaluated the likeability of novel neutral faces after a brief exposure to a happy or fearful face...
June 1, 2017: Psychological Science
https://www.readbyqxmd.com/read/28611693/paired-associative-stimulation-induced-long-term-potentiation-like-motor-cortex-plasticity-in-healthy-adolescents
#11
Jonathan C Lee, Paul E Croarkin, Stephanie H Ameis, Yinming Sun, Daniel M Blumberger, Tarek K Rajji, Zafiris J Daskalakis
OBJECTIVE: The objective of this study was to evaluate the feasibility of using paired-associative stimulation (PAS) to study excitatory and inhibitory plasticity in adolescents while examining variables that may moderate plasticity (such as sex and environment). METHODS: We recruited 34 healthy adolescents (aged 13-19, 13 males, 21 females). To evaluate excitatory plasticity, we compared mean motor-evoked potentials (MEPs) elicited by single-pulse transcranial magnetic stimulation (TMS) before and after PAS at 0, 15, and 30 min...
2017: Frontiers in Psychiatry
https://www.readbyqxmd.com/read/28610848/modulating-phonemic-fluency-performance-in-healthy-subjects-with-transcranial-magnetic-stimulation-over-the-left-or-right-lateral-frontal-cortex
#12
Daniela Smirni, Patrizia Turriziani, Giuseppa Renata Mangano, Martina Bracco, Massimiliano Oliveri, Lisa Cipolotti
A growing body of evidence have suggested that non-invasive brain stimulation techniques, such as transcranial magnetic stimulation (TMS) and transcranial direct current stimulation (tDCS), can improve the performance of aphasic patients in language tasks. For example, application of inhibitory rTMS or tDCs over the right frontal lobe of dysphasic patients resulted in improved naming abilities. Several studies have also reported that in healthy controls (HC) tDCS application over the left prefrontal cortex (PFC) improve performance in naming and semantic fluency tasks...
June 10, 2017: Neuropsychologia
https://www.readbyqxmd.com/read/28606723/changes-in-cortical-excitability-during-paired-associative-stimulation-in-parkinson-s-disease-patients-and-healthy-subjects
#13
Aleksandra Kačar, Sladjan D Milanović, Saša R Filipović, Miloš R Ljubisavljević
Paired associative stimulation (PAS) combines repetitive peripheral nerve stimulation with motor cortex (M1) transcranial magnetic stimulation (TMS), to induce plastic-like changes of cortical excitability. While much attention has been dedicated to post-PAS effects little is known about processes during PAS. We compared the time-course of changes in M1 excitability during standard facilitatory PAS intervention among patients with Parkinson's disease (PD), known to have diminished post-PAS response, and healthy subjects...
June 9, 2017: Neuroscience Research
https://www.readbyqxmd.com/read/28606388/the-role-of-dorsal-premotor-cortex-in-mental-rotation-a-transcranial-magnetic-stimulation-study
#14
Giorgia Cona, Giulia Panozzo, Carlo Semenza
Although activation of dorsal premotor cortex (PMd) has been consistently observed in the neuroimaging studies of mental rotation, the functional meaning of PMd activation is still unclear and multiple alternative explanations have been suggested. The present study used repetitive transcranial magnetic stimulation (rTMS) to investigate the role of PMd in mental rotation. Two tasks were used, involving mental rotation of hands and abstract objects, with either matching (same stimuli) or mirror stimuli. Compared to sham stimulation, TMS over right and left PMd regions significantly affected accuracy in the object task, specifically for the same stimuli...
August 2017: Brain and Cognition
https://www.readbyqxmd.com/read/28604171/abnormal-eeg-responses-to-tms-during-the-cortical-silent-period-are-associated-with-hand-function-in-chronic-stroke
#15
Whitney A Gray, Jacqueline A Palmer, Steven L Wolf, Michael R Borich
BACKGROUND: Abnormal brain excitability influences recovery after stroke at which time a prolonged transcranial magnetic stimulation (TMS)-induced electromyographic silent period is thought to reflect abnormal inhibitory interneuron excitability. Cortical excitability can be probed directly during the silent period using concurrent electroencephalography (EEG) of TMS-evoked responses. OBJECTIVE: The primary study objectives were to characterize TMS-evoked cortical potentials (TEPs) using EEG and to investigate associations with persistent hand and arm motor dysfunction in individuals with chronic stroke...
June 1, 2017: Neurorehabilitation and Neural Repair
https://www.readbyqxmd.com/read/28602998/the-right-hemisphere-is-independent-from-the-left-hemisphere-in-allocating-visuospatial-attention
#16
Arianna Zuanazzi, Luigi Cattaneo
The capacity to allocate visuospatial attention is traditionally considered right-lateralized according to the effects of unilateral cerebral lesions. Contralateral hemi-spatial neglect occurs much more frequently after lesions of the right hemisphere, which has therefore been dubbed as 'dominant'. This pattern of symptoms is supported by functional models that postulate either independence or reciprocal influences between the two hemispheres. Here we specifically explored the dependency of the right hemisphere (RH) from the left hemisphere (LH) in spatial attention...
June 9, 2017: Neuropsychologia
https://www.readbyqxmd.com/read/28586349/comparison-of-the-induced-fields-using-different-coil-configurations-during-deep-transcranial-magnetic-stimulation
#17
Mai Lu, Shoogo Ueno
Stimulation of deeper brain structures by transcranial magnetic stimulation (TMS) plays a role in the study of reward and motivation mechanisms, which may be beneficial in the treatment of several neurological and psychiatric disorders. However, electric field distributions induced in the brain by deep transcranial magnetic stimulation (dTMS) are still unknown. In this paper, the double cone coil, H-coil and Halo-circular assembly (HCA) coil which have been proposed for dTMS have been numerically designed. The distributions of magnetic flux density, induced electric field in an anatomically based realistic head model by applying the dTMS coils were numerically calculated by the impedance method...
2017: PloS One
https://www.readbyqxmd.com/read/28579362/changes-in-transcranial-magnetic-stimulation-outcome-measures-in-response-to-upper-limb-physical-training-in-stroke-a-systematic-review-of-randomized-controlled-trials
#18
REVIEW
Louis-David Beaulieu, Marie-Hélène Milot
BACKGROUND: Physical training is known to be an effective intervention to improve sensorimotor impairments after stroke. However, the link between brain plastic changes, assessed by transcranial magnetic stimulation (TMS), and sensorimotor recovery in response to physical training is still misunderstood. We systematically reviewed reports of randomized controlled trials (RCTs) involving the use of TMS over the primary motor cortex (M1) to probe brain plasticity after upper-limb physical training interventions in people with stroke...
June 1, 2017: Annals of Physical and Rehabilitation Medicine
https://www.readbyqxmd.com/read/28572764/the-effects-of-modified-constraint-induced-movement-therapy-in-acute-subcortical-cerebral-infarction
#19
Changshen Yu, Wanjun Wang, Yue Zhang, Yizhao Wang, Weijia Hou, Shoufeng Liu, Chunlin Gao, Chen Wang, Lidong Mo, Jialing Wu
Background: Constraint-induced movement therapy (CIMT) promotes upper extremity recovery post stroke, however, it is difficult to implement clinically due to its high resource demand and safety of the restraint. Therefore, we propose that modified CIMT (mCIMT) be used to treat individuals with acute subcortical infarction. Objective: To evaluate the therapeutic effects of mCIMT in patients with acute subcortical infarction, and investigate the possible mechanisms underlying the effect. Methods: The role of mCIMT was investigated in 26 individuals experiencing subcortical infarction in the preceding 14 days...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28565833/high-frequency-repetitive-transcranial-magnetic-stimulation-for-treating-moderate-traumatic-brain-injury-in-rats-a-pilot-study
#20
Xia Lu, Xinjie Bao, Jiantao Li, Guanghao Zhang, Jian Guan, Yunzhou Gao, Peilin Wu, Zhaohui Zhu, Xiaolin Huo, Renzhi Wang
Transcranial magnetic stimulation (TMS) is a method of noninvasive brain stimulation that causes neuromodulation by activating neurons or changing excitability in a certain brain area. Considering the known effects of TMS and the pathophysiology of traumatic brain injury (TBI), TMS was proposed to have potential for treating this condition. Moderate TBI was induced in adult male Sprague Dawley rats using Feeney's weight-dropping method. Injured rats were divided into a TMS group and a control group. Repetitive TMS (rTMS) was administered to rats in the TMS group from post-TBI day 2...
May 2017: Experimental and Therapeutic Medicine
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