Brain Stimulation Mechanisms and Therapeutic Effects in Neural Circuits PDF Download

Author: Kevin A. Caulfield
Publisher: Frontiers Media SA
ISBN: 2832541070
Category : Science
Languages : en
Pages : 120

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Author: National Academies of Sciences, Engineering, and Medicine
Publisher: National Academies Press
ISBN: 0309376211
Category : Medical
Languages : en
Pages : 103

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Based on advances in biotechnology and neuroscience, non-invasive neuromodulation devices are poised to gain clinical importance in the coming years and to be of increasing interest to patients, clinicians,health systems, payers, and industry. Evidence suggests that both therapeutic and non-therapeutic applications of non-invasive neuromodulation will continue to expand in coming years, particularly for indications where treatments are currently insufficient, such as drug-resistant depression. Given the growing interest in non-invasive neuromodulation technologies, the Institute of Medicine's Forum on Neuroscience and Nervous System Disorders convened a workshop, inviting a range of stakeholders - including developers of devices and new technologies, researchers, clinicians, ethicists, regulators, and payers - to explore the opportunities, challenges, and ethical questions surrounding the development, regulation, and reimbursement of these devices for the treatment of nervous system disorders as well as for non-therapeutic uses, including cognitive and functional enhancement. This report highlights the presentation and discussion of the workshop.

Author: Tom Dufor
Publisher:
ISBN:
Category :
Languages : en
Pages : 0

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Neuroplasticity is essential for the establishment and strengthening of neural circuits during the critical period of development, and are required for the brain to adapt to its environment. The mechanisms of plasticity vary throughout life, are generally more difficult to induce in the adult brain, and decrease with advancing age. Repetitive transcranial magnetic stimulation (rTMS) is commonly used to modulate cortical excitability and shows promise in the treatment of some neurological disorders. Low intensity magnetic stimulation (LI-rTMS), which does not directly elicit action potentials in the stimulated neurons, have also shown some therapeutic effects, and it is important to determine the biological mechanisms underlying the effects of these low intensity magnetic fields, such as would occur in the regions surrounding the central high-intensity focus of rTMS. We have used a focal low-intensity magnetic stimulation (10mT) to address some of these issues in the mouse cerebellum and olivocerebellar path. The cerebellum model is particularly useful as its development, structure, ageing and function are well described which allows us to easily detect eventual modifications. We assessed effects of in vivo or in vitro LI-rTMS on neuronal morphology, behavior, and post-lesion plasticity. We first showed that LI-rTMS treatment in vivo alters dendritic spines and dendritic morphology, in association with improved spatial memory. These effects were age dependent. To optimize stimulation parameters in order to induce post-lesion reinnervation we used our in vitro model of post-lesion repair to systematically investigate the effects of different LI-rTMS stimulation patterns and frequencies. We showed that the pattern of stimulation is critical for allowing repair, rather than the total number of stimulation pulses. Finally, we looked for potential underlying mechanisms participating in the effects of the LI-rTMS, using mouse mutants in vivo or in vitro. We found that the cryptochromes, which have magnetoreceptor properties, must be present for the response to magnetic stimulation to be transduced into biological effects. The ensemble of our results indicate that the effects of LI-rTMS depend upon the presence of magnetoreceptors, the stimulation protocol, and the age of the animal suggesting that future therapeutic strategies must be adapted to the neuronal context in each individual person.

Author: Jean Paul Buu Cuong Nguyen
Publisher: Frontiers Media SA
ISBN: 2832551874
Category : Medical
Languages : en
Pages : 105

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Numerous publications have attested to the therapeutic efficacy of non-invasive brain stimulation (NIBS) techniques, such as repetitive transcranial magnetic stimulation (rTMS) and low-intensity transcranial electrical stimulation (tES). These methods have been used in the treatment of various neurological-related conditions, such as chronic pain, cognitive disorders, movement disorders, or stroke rehabilitation. Across these different fields, evidence suggests therapeutic efficacy could be improved when combining NIBS technique in combination with another type of more commonly utilized therapeutic approaches (e.g., motor and/or cognitive training, pharmacological, physical and neurorehabilitation).

Author: Murtaza Mogri
Publisher: Stanford University
ISBN:
Category :
Languages : en
Pages : 123

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Optogenetic neuromodulation is giving scientists an unprecedented ability to modulate neural circuits, providing specificity with regards to location, cell type, as well as neuromodulatory effect. On the other hand, electrical stimulation and lesions, methods commonly used to study neural circuits, are lacking in specificity, often affecting both local cells and passing axons, as well as multiple cell types. Our laboratory has been at the forefront of the field of optogenetics, having developed, for use in mammalian systems, Channelrhodopsin-2 (ChR2), an algal light-activated cation channel that depolarizes neurons in response to blue light, and Natronomonas pharaonis halorhodopsin (eNpHR), a chloride pump that hyperpolarizes neurons in response to amber light. These proteins can control neuronal activity with millisecond timescale precision, and through promoters, they can be targeted to specific cell-types in heterogeneous tissue. Along with its specificity, light stimulation with optogenetic tools often allows the recording of neural activity without the artifact that obfuscates recordings with electrical stimulation. The advantages provided by optogenetics allowed us to make a breakthrough in determining the therapeutic mechanism of deep brain stimulation, a robust treatment for Parkinson's disease in which stimulating electrodes are implanted deep in the brain. Using optogenetics, we replicated the effect of deep brain stimulation by modulating cortical inputs into the region where the stimulating electrode is normally placed. Combined with other corroborating publications, a hypothesis is emerging that electrical stimulation deep in the brain actually produces its effect by modulating cortical projections to the deep brain region. Based on this concept, several clinical studies are being done to better understand the cortical role in Parkinson's disease and determine whether cortical stimulation (potentially non-invasive), could be an alternative to the invasive implants currently used. In order to perform these experiments, we studied the transmission of visible light in brain tissue to estimate the volume of activation produced by optogenetic stimulation and developed a device to measure fluorescence in awake, behaving animals, allowing the quantification of virally transfected gene expression over time, as well as the localization of expression along axon bundles. The knowledge gained from these experiments will have a significant impact on future experiments in the broader field of optogenetics.

Author: Irving Reti
Publisher: John Wiley & Sons
ISBN: 111856829X
Category : Medical
Languages : en
Pages : 364

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Brain stimulation technologies are both tools to probe brain function and to provide therapeutic options for patients with neuropsychiatric disease where pharmacological options are not viable. Although the field has been in existence for over seventy years, research interest in brain stimulation has been on the rise particularly in the last two decades. Brain Stimulation: Methodologies and Interventions is an introduction to the field of brain stimulation technology and its applications. The book explores how brainstimulating technologies work in the context of brain pathways that mediate normal and abnormal brain function. Chapters cover neuroanatomy and activity dependent changes in neuronal function triggered by brain stimulation, as well as applications of brain stimulation technologies themselves, including noninvasive procedures that rely on convulsive or seizure therapeutics, and non-convulsive therapies such as magnetic and electrical brain stimulation. Authored by an international group of leaders in the field, Brain Stimulation is a valuable resource for both neuroscience researchers and clinicians.

Author: Masahito Yamagata
Publisher: Frontiers Media SA
ISBN: 2889711498
Category : Science
Languages : en
Pages : 294

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Author: Stephanie Grehl
Publisher:
ISBN:
Category :
Languages : en
Pages :

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[Truncated abstract] Electromagnetic fields are widely used to non-invasively stimulate the human brain in clinical treatment and research. Repetitive transcranial magnetic stimulation (rTMS) in humans is applied with maximal high-intensity fields of ~1-2.5 Tesla (T), however the coils used induce currents both at the site of maximum stimulation and in surrounding brain regions, albeit at lower intensities. Importantly, low intensity repetitive transcranial magnetic stimulation in humans (mT range) modifies cortical function, brain oscillations and is beneficial for the treatment of depression. While the effects of magnetic stimulation have been suggested to vary according to frequency and intensity, mechanisms called into action by these parameters and adjacent lowintensity subthreshold stimulation remain unknown. We investigated the effects of different low intensity repetitive magnetic stimulation (LI-rMS) parameters (10-13 mT) in vitro and describe key aspects of custom tailored LIrMS delivery for the in vitro setting. We applied LI-rMS at different frequencies to primary cortical cultures for 4 days and assessed survival and morphological changes. To understand underlying mechanisms, we measured intracellular calcium flux during LI-rMS and subsequent changes in gene expression. Our results show stimulationspecific effects of LI-rMS. In cortical cultures, straight high frequencies (10 Hz and 100 Hz) affected cell survival, while neuronal outgrowth and branching were inhibited only by 1 Hz stimulation. Moreover, all frequencies induced calcium release from intracellular stores and induced stimulation-specific changes in expression of genes related to apoptosis and neurite outgrowth.

Author:
Publisher: Oxford University Press
ISBN: 0192568256
Category : Psychology
Languages : en
Pages : 1249

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Transcranial stimulation encompasses noninvasive methods that transmit physical fields-such as magnetic, electric, ultrasound, and light-to the brain to modulate its function. The most widespread approach, transcranial magnetic stimulation (TMS), has emerged as an important tool in several areas of neuroscience as well as in clinical applications in psychiatry and neurology. Originally envisioned as a way to measure the responsiveness and conduction speed of neurons and synapses in the brain and spinal cord, TMS has also become an important tool for changing the activity of brain neurons and the functions they subserve as well as an causal adjunct to brain imaging and mapping techniques. Along with transcranial electrical stimulation techniques, TMS has diffused far beyond the borders of clinical neurophysiology and into cognitive, perceptual, behavioural, and therapeutic investigation and attracted a highly diverse group of users and would-be users. Another major success of TMS has been as a treatment in psychiatry, where it is now in routine use worldwide. The field of noninvasive neuromodulation has matured and diversified considerably in the past decade, with an expansion in the number of tools available and our understanding of their mechanisms of action. This second edition of The Oxford Handbook of Transcranial Stimulation brings together the latest developments and important advances in all areas of Transcranial stimulation. The new volume captures the rapid progress made since the first edition, and provides an authoritative and comprehensive review of the state of the art. It also highlights challenges, opportunities, and future directions for this rapidly changing field. The book focuses on the scientific and technical background required to understand transcranial stimulation techniques and a wide-ranging survey of their burgeoning applications in neurophysiology, neuroscience, and therapy. Each of its six sections deals with a major area and is edited by an international authority therein. It will serve researchers, clinicians, students, and others as the definitive text in this area for years to come.

Author: Daniel Laskowitz
Publisher: CRC Press
ISBN: 1498766579
Category : Medical
Languages : en
Pages : 388

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Traumatic brain injury (TBI) remains a significant source of death and permanent disability, contributing to nearly one-third of all injury related deaths in the United States and exacting a profound personal and economic toll. Despite the increased resources that have recently been brought to bear to improve our understanding of TBI, the developme