scholarly journals Neuroplasticity induction using transcranial magnetic stimulation

2019 ◽  
Keyword(s):  
Synaptic Plasticity ◽  
Transcranial Magnetic Stimulation ◽  
Magnetic Stimulation ◽  
Neuronal Excitability ◽  
Scientific Data ◽  
Dependent Manner ◽  
Global Dynamic ◽  
Endogenous Dopamine ◽  
Ipsilateral Striatum ◽  
The Brain

In this article, we have displayed the results of an analysis of modern scientific data on the induction of neuroplasticity using transcranial magnetic stimulation. We presented the multilevel neuroplastic effects of electromagnetic fields caused by transcranial magnetic stimulation (TMS). The authors of the article determined that transcranial magnetic stimulation uses variable magnetic fields to non-invasively stimulate neurons in the brain. The basis of this method is the modulation of neuroplasticity mechanisms with the subsequent reorganization of neural networks. Repeated TMS (rTMS), which is widely used in neurology, affects neurotransmitters and synaptic plasticity, glial cells and the prevention of neuronal death. The neurotrophic effects of rTMS on dendritic growth, as well as growth and neurotrophic factors, are described. An important aspect of the action of TMS is its effect on neuroprotective mechanisms. A neuroimaging study of patients with Parkinson's disease showed that rTMS increased the concentration of endogenous dopamine in the ipsilateral striatum. After rTMS exposure, the number of β-adrenergic receptors in the frontal and cingulate cortex decreases, but the number of NMDA receptors in the ventromedial thalamus, amygdala, and parietal cortex increases. These processes ultimately lead to the induction of prolonged potentiation. In response to rTMS, neuronal excitability changes due to a shift in ion balance around a population of stimulated neurons; this shift manifests itself as altered synaptic plasticity. Combinations of rTMS treatment and pharmacotherapy (e.g., small doses of memantine) may block the alleviating effect during prolonged potentiation. Studies using models of transient ischemic attack and prolonged ischemia have shown that rTMS protects neurons from death and alters the blood flow and metabolism in the brain. It has been demonstrated that TMS has a proven ability to modulate the internal activity of the brain in a frequency-dependent manner, generate contralateral responses, provide, along with the neuromodulating and neurostimulating effect, affect the brain as a global dynamic system.

scholarly journals Modern non-medicinal methods of influence on neuroplasticity in the system of neurorehabilitation (literature review)

2019 ◽  
Author(s):  
Maksym Chernenko
Keyword(s):  
Synaptic Plasticity ◽  
Transcranial Magnetic Stimulation ◽  
Neurotrophic Factors ◽  
Neuronal Death ◽  
Magnetic Stimulation ◽  
Dependent Manner ◽  
Global Dynamic ◽  
Dendrites Growth ◽  
The Impact ◽  
The Brain

In this article, the authors addressed the impact of non-drug methods on neuroplasticity in the neurorehabilitation system. Multilevel neuroplastic eff ects of electromagnetic fields caused by transcranial magnetic stimulation (TMS) are presented. The effects of TMS on neurotransmitters and synaptic plasticity, glial cells and the prevention of neuronal death are examined. The neurotrophic effects of TMS on the growth of dendrites, growth and neurotrophic factors are described. The eff ect of TMS on the genetic apparatus of neuronsis traced. It has been demonstrated that TMS has a proven ability to modulate the internal activity of the brain in a frequency-dependent manner, generate contralateral responses, provide, along with the neuromodulatory and neurostimulating eff ect, influence the brain as a global dynamic system. Key words: neuroplasticity, neurorehabilitation, synaptic plasticity, transcranial magnetic stimulation

scholarly journals Neurorehabilitation Potentials of Repetitive Transcranial Magnetic Stimulation in Post-stroke Motor and Speech Recovery

2019 ◽  
Author(s):  
Henry Liu
Keyword(s):  
Ischemic Stroke ◽  
Transcranial Magnetic Stimulation ◽  
Magnetic Stimulation ◽  
Neuronal Excitability ◽  
Repetitive Transcranial Magnetic Stimulation ◽  
Stroke Recovery ◽  
Post Stroke ◽  
Speech Rehabilitation ◽  
Cortical Regions ◽  
The Brain

Ischemic stroke is a consequence of diminished cerebral blood flow to cortical regions, resulting in subsequent reductions in excitability. The brain undergoes immense cortical remapping following a stroke, which can be facilitated by neuronal excitability. However, analyses of electrophysiologic recordings, cortical stimulation, and fMRI reveal a decline in the excitability of the ipsilesional hemisphere following an ischemic stroke and an increase in interhemispheric inhibition by the contralesional hemisphere. Recent findings have implicated non-invasive stimulation with post-stroke recovery through the induction of synaptic plasticity and recruitment of neurotrophic factors to the peri-infarct region. The aim of this paper is to review recent research that has beendevoted to repetitive transcranial magnetic stimulation (rTMS) and its use as a therapeutic tool in motor and speech rehabilitation via the alteration of excitability in the brain post-ischemic stroke. 

Stereotactic Brain Biopsy in Eloquent Areas Assisted by Navigated Transcranial Magnetic Stimulation: a Technical Case Report

2018 ◽  
Vol 17 (3) ◽  
pp. E124-E129 ◽  
Author(s):  
Jiri Bartek ◽  
Gerald Cooray ◽  
Mominul Islam ◽  
Margret Jensdottir
Keyword(s):  
Transcranial Magnetic Stimulation ◽  
Magnetic Stimulation ◽  
Stereotactic Biopsy ◽  
Brain Biopsy ◽  
Awake Surgery ◽  
Histopathological Diagnosis ◽  
Navigated Transcranial Magnetic Stimulation ◽  
Stereotactic Brain Biopsy ◽  
Eloquent Areas ◽  
The Brain

Abstract BACKGROUND AND IMPORTANCE Stereotactic brain biopsy (SB) is an important part of the neurosurgical armamentarium, with the possibility of achieving histopathological diagnosis in otherwise inaccessible lesions of the brain. Nevertheless, the procedure is not without the risk of morbidity, which is especially true for lesions in eloquent parts of the brain, where even a minor adverse event can result in significant deficits. Navigated transcranial magnetic stimulation (nTMS) is widely used to chart lesions in eloquent areas, successfully guiding maximal safe resection, while its potential role in aiding with the planning of a stereotactic biopsy is so far unexplored. CLINICAL PRESENTATION Magnetic resonance imaging of a 67-yr-old woman presenting with dysphasia revealed a noncontrast enhancing left-sided lesion in the frontal and parietal pars opercularis. Due to the location of the lesion, nTMS was used to chart both primary motor and language cortex, utilizing this information to plan a safe SB trajectory and sampling area according to the initial work-up recommendations from the multidisciplinary neuro-oncology board. The SB was uneventful, with histology revealing a ganglioglioma, WHO I. The patient was discharged the following day, having declined to proceed with tumor resection (awake surgery) due to the non-negligible risk of morbidity. Upon 1- and 3-mo follow-up, she showed no signs of any procedure-related deficits. CONCLUSION nTMS can be implemented to aid with the planning of a stereotactic biopsy procedure in eloquent areas of the brain, and should be considered part of the neurosurgical armamentarium.

Direct Causal Networks for the Study of Transcranial Magnetic Stimulation Effects on Focal Epileptiform Discharges

2015 ◽  
Vol 25 (05) ◽  
pp. 1550006 ◽  
Author(s):  
Dimitris Kugiumtzis ◽  
Vasilios K. Kimiskidis
Keyword(s):  
Transcranial Magnetic Stimulation ◽  
Network Structure ◽  
Magnetic Stimulation ◽  
Brain Connectivity ◽  
Effective Connectivity ◽  
Epileptic Focus ◽  
Sham Stimulation ◽  
Focal Seizures ◽  
Epileptiform Discharges ◽  
The Brain

Background: Transcranial magnetic stimulation (TMS) can have inhibitory effects on epileptiform discharges (EDs) of patients with focal seizures. However, the brain connectivity before, during and after EDs, with or without the administration of TMS, has not been extensively explored. Objective: To investigate the brain network of effective connectivity during ED with and without TMS in patients with focal seizures. Methods: For the effective connectivity a direct causality measure is applied termed partial mutual information from mixed embedding (PMIME). TMS-EEG data from two patients with focal seizures were analyzed. Each EEG record contained a number of EDs in the majority of which TMS was administered over the epileptic focus. As a control condition, sham stimulation over the epileptogenic zone or real TMS at a distance from the epileptic focus was also performed. The change in brain connectivity structure was investigated from the causal networks formed at each sliding window. Conclusion: The PMIME could detect distinct changes in the network structure before, within, and after ED. The administration of real TMS over the epileptic focus, in contrast to sham stimulation, terminated the ED prematurely in a node-specific manner and regained the network structure as if it would have terminated spontaneously.

scholarly journals Segregated brain state during hypnosis

2019 ◽  
Author(s):  
Jarno Tuominen ◽  
Sakari Kallio ◽  
Valtteri Kaasinen ◽  
Henry Railo
Keyword(s):  
Transcranial Magnetic Stimulation ◽  
Magnetic Stimulation ◽  
Brain Activation ◽  
Brain State ◽  
Neural Connectivity ◽  
Single Word ◽  
Electrophysiological Response ◽  
Hypnotic Induction ◽  
Brain States ◽  
The Brain

Can the brain be shifted into a different state using a simple social cue, as tests on highly hypnotisable subjects would suggest? Demonstrating an altered brain state is difficult. Brain activation varies greatly during wakefulness and can be voluntarily influenced. We measured the complexity of electrophysiological response to transcranial magnetic stimulation (TMS) in one “hypnotic virtuoso”. Such a measure produces a response outside the subject’s voluntary control and has been proven adequate for discriminating conscious from unconscious brain states. We show that a single-word hypnotic induction robustly shifted global neural connectivity into a state where activity remained sustained but failed to ignite strong, coherent activity in frontoparietal cortices. Changes in perturbational complexity indicate a similar move toward a more segregated state. We interpret these findings to suggest a shift in the underlying state of the brain, likely moderating subsequent hypnotic responding. [preprint updated 20/02/2020]

Neurostimulation therapies

2020 ◽  
pp. 217-232
Author(s):  
Daniel W. O’Connor ◽  
Christos Plakiotis ◽  
Peter Farnbach
Keyword(s):  
Cognitive Impairment ◽  
Deep Brain Stimulation ◽  
Transcranial Magnetic Stimulation ◽  
Side Effects ◽  
Magnetic Stimulation ◽  
Obsessive Compulsive ◽  
Compulsive Disorder ◽  
Treatment Of Depression ◽  
Electrical Impulses ◽  
The Brain

Electroconvulsive therapy (ECT), transcranial magnetic stimulation (TMS) and deep brain stimulation (DBS) all entail the delivery of electrical impulses to the brain with the aim of relieving mental disorders. ECT is an effective treatment of depression, mania and catatonia and, to a lesser extent, of schizophrenia. Its side effects, principally cognitive impairment, are mitigated through the use of individually tailored, unilateral delivery. TMS is more convenient but of lesser effectiveness. DBS, while reversible and thus safer than lesional surgery, is a major undertaking that is reserved at present for profoundly disabling depression, obsessive-compulsive disorder (OCD), and Tourette’s syndrome.

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