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Motor Evoked Potentials

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https://www.readbyqxmd.com/read/28938143/contribution-of-transcranial-magnetic-stimulation-to-assessment-of-brain-connectivity-and-networks
#1
REVIEW
Mark Hallett, Riccardo Di Iorio, Paolo Maria Rossini, Jung E Park, Robert Chen, Pablo Celnik, Antonio P Strafella, Hideyuki Matsumoto, Yoshikazu Ugawa
The goal of this review is to show how transcranial magnetic stimulation (TMS) techniques can make a contribution to the study of brain networks. Brain networks are fundamental in understanding how the brain operates. Effects on remote areas can be directly observed or identified after a period of stimulation, and each section of this review will discuss one method. EEG analyzed following TMS is called TMS-evoked potentials (TEPs). A conditioning TMS can influence the effect of a test TMS given over the motor cortex...
September 5, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28937468/psychogenic-low-back-pain-and-hysterical-paralysis-in-adolescence
#2
Tsukasa Kanchiku, Hidenori Suzuki, Yasuaki Imajo, Yuichiro Yoshida, Norihiro Nishida, Toshihiko Taguchi
STUDY DESIGN: A retrospective review. OBJECTIVE: The purpose of this study was to investigate the clinical outcomes in adolescents diagnosed with psychogenic low-back pain and hysterical paralysis and to evaluate the efficacy of differential diagnosis methods. SUMMARY OF BACKGROUND DATA: The incidence of low-back pain in adolescence is similar to that in adults, but the causes of low-back pain are difficult to determine in most cases. For these patients, a definitive diagnosis of psychogenic low-back pain and hysterical paralysis as well as adequate treatment are clinically important to avoid unnecessary surgical treatment...
October 2017: Clinical Spine Surgery
https://www.readbyqxmd.com/read/28935187/differentiation-of-motor-evoked-potentials-elicited-from-multiple-forearm-muscles-an-investigation-with-high-density-surface-electromyography
#3
J L Neva, A Gallina, S Peters, S J Garland, L A Boyd
Transcranial magnetic stimulation (TMS) is a non-invasive method to measure corticospinal excitability of the primary motor cortex. However, motor evoked potentials (MEPs) elicited by TMS in a target muscle are variable; inconsistent MEPs may be due to overlapping cortical muscle representations and/or volume conduction from neighbouring muscles. The source of variable muscle responses may not be apparent using conventional bipolar electromyography (EMG), particularly over areas with several distinct neighbouring muscles (e...
September 18, 2017: Brain Research
https://www.readbyqxmd.com/read/28934887/somatosensory-cortex-excitability-changes-due-to-differences-in-instruction-conditions-of-motor-imagery
#4
Takashi Hasegawa, Hironori Miyata, Keita Nishi, Akira Sagari, Takefumi Moriuchi, Takashi Matsuo, Takayuki Tabira, Toshio Higashi
Purpose Vivid motor imagery appears to be associated with improved motor learning efficiency. However, the practical difficulties in measuring vivid motor imagery warrant new analytical approaches. The present study aimed to determine the instruction conditions for which vividness in motor imagery could be more easily seen and the excitability of the sensory cortex as it relates to the motor image. Materials and methods In total, 15 healthy, right-handed volunteers were instructed to imagine grasping a rubber ball under a verbal-only instruction condition (verbal condition), a verbal + visual instruction condition (visual condition), and a verbal + execution (physically grasping a real ball) condition (execution condition)...
September 21, 2017: Somatosensory & Motor Research
https://www.readbyqxmd.com/read/28930862/an-innovative-ergometer-to-measure-neuromuscular-fatigue-immediately-after-cycling
#5
Douglas Doyle-Baker, John Temesi, Mary E Medysky, Robert J Holash, Guillaume Y Millet
PURPOSE: When assessing neuromuscular fatigue (NMF) from dynamic exercise using large muscle mass (e.g. cycling), most studies have delayed measurement for 1-3 min after task failure. This study aimed to determine the reliability of an innovative cycling ergometer permitting the start of fatigue measurement within 1 s after cycling. METHODS: Twelve subjects participated in two experimental sessions. Knee-extensor NMF was assessed by electrical nerve and transcranial magnetic stimulation with both a traditional chair set-up (PRE and POST-Chair, 2 min post-exercise) and the new cycling ergometer (PRE, every 3 min during incremental exercise and POST-Bike, at task failure)...
September 19, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28925006/evidence-based-source-modeling-of-nociceptive-cortical-responses-a-direct-comparison-of-scalp-and-intracranial-activity-in-humans
#6
Claire Bradley, Hélène Bastuji, Luis Garcia-Larrea
BACKGROUND: Source modeling of EEG traditionally relies on interplay between physiological hypotheses and mathematical estimates. We propose to optimize the process by using evidence gathered from brain imaging and intracortical recordings. METHODS: We recorded laser-evoked potentials in 18 healthy participants, using high-density EEG. Brain sources were modeled during the first second poststimulus, constraining their initial position to regions where nociceptive-related activity has been ascertained by intracranial EEG...
September 18, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28917695/the-impact-of-gabaergic-drugs-on-tms-induced-brain-oscillations-in-human-motor-cortex
#7
Isabella Premoli, Til O Bergmann, Matteo Fecchio, Mario Rosanova, Andrea Biondi, Paolo Belardinelli, Ulf Ziemann
Brain responses to transcranial magnetic stimulation (TMS) as measured with electroencephalography (EEG) have so far been assessed either by TMS-evoked EEG potentials (TEPs), mostly reflecting phase-locked neuronal activity, or time-frequency-representations (TFRs), reflecting oscillatory power arising from a mixture of both evoked (i.e., phase-locked) and induced (i.e., non-phase-locked) responses. Single-pulse TMS of the human primary motor cortex induces a specific pattern of oscillatory changes, characterized by an early (30-200 ms after TMS) synchronization in the α- and β-bands over the stimulated sensorimotor cortex and adjacent lateral frontal cortex, followed by a late (200-400 ms) α- and β-desynchronization over the stimulated and contralateral sensorimotor cortex...
September 14, 2017: NeuroImage
https://www.readbyqxmd.com/read/28916867/reorganization-of-motor-representations-in-patients-with-brain-lesions-a-navigated-transcranial-magnetic-stimulation-study
#8
Lucia Bulubas, Nico Sollmann, Noriko Tanigawa, Claus Zimmer, Bernhard Meyer, Sandro M Krieg
This is an explorative study applying presurgical navigated transcranial magnetic stimulation (nTMS) to investigate the spatial distributions of motor sites to reveal tumor-induced brain plasticity in patients with brain tumors. We analyzed nTMS-based motor maps derived from presurgical mapping of 100 patients with motor eloquently located brain tumors (tumors in the frontal lobe, the precentral gyrus [PrG], the postcentral gyrus [PoG], the remaining parietal lobe, or the temporal lobe). Based on these motor maps, we systematically investigated changes in motor evoked potential (MEP) counts among 4 gyri (PrG, PoG, medial frontal gyrus, and superior frontal gyrus) between subgroups of patients according to the tumor location in order to depict the tumor's influence on reorganization...
September 15, 2017: Brain Topography
https://www.readbyqxmd.com/read/28915323/hair-cell-transduction-tuning-and-synaptic-transmission-in-the-mammalian-cochlea
#9
Robert Fettiplace
Sound pressure fluctuations striking the ear are conveyed to the cochlea, where they vibrate the basilar membrane on which sit hair cells, the mechanoreceptors of the inner ear. Recordings of hair cell electrical responses have shown that they transduce sound via submicrometer deflections of their hair bundles, which are arrays of interconnected stereocilia containing the mechanoelectrical transducer (MET) channels. MET channels are activated by tension in extracellular tip links bridging adjacent stereocilia, and they can respond within microseconds to nanometer displacements of the bundle, facilitated by multiple processes of Ca2+-dependent adaptation...
September 12, 2017: Comprehensive Physiology
https://www.readbyqxmd.com/read/28910407/the-spectral-features-of-eeg-responses-to-transcranial-magnetic-stimulation-of-the-primary-motor-cortex-depend-on-the-amplitude-of-the-motor-evoked-potentials
#10
Matteo Fecchio, Andrea Pigorini, Angela Comanducci, Simone Sarasso, Silvia Casarotto, Isabella Premoli, Chiara-Camilla Derchi, Alice Mazza, Simone Russo, Federico Resta, Fabio Ferrarelli, Maurizio Mariotti, Ulf Ziemann, Marcello Massimini, Mario Rosanova
Transcranial magnetic stimulation (TMS) of the primary motor cortex (M1) can excite both cortico-cortical and cortico-spinal axons resulting in TMS-evoked potentials (TEPs) and motor-evoked potentials (MEPs), respectively. Despite this remarkable difference with other cortical areas, the influence of motor output and its amplitude on TEPs is largely unknown. Here we studied TEPs resulting from M1 stimulation and assessed whether their waveform and spectral features depend on the MEP amplitude. To this aim, we performed two separate experiments...
2017: PloS One
https://www.readbyqxmd.com/read/28910370/intra-and-inter-session-reliability-of-rapid-transcranial-magnetic-stimulation-stimulus-response-curves-of-tibialis-anterior-muscle-in-healthy-older-adults
#11
Elisabetta Peri, Emilia Ambrosini, Vera Maria Colombo, Mark van de Ruit, Michael J Grey, Marco Monticone, Giorgio Ferriero, Alessandra Pedrocchi, Giancarlo Ferrigno, Simona Ferrante
OBJECTIVE: The clinical use of Transcranial Magnetic Stimulation (TMS) as a technique to assess corticospinal excitability is limited by the time for data acquisition and the measurement variability. This study aimed at evaluating the reliability of Stimulus-Response (SR) curves acquired with a recently proposed rapid protocol on tibialis anterior muscle of healthy older adults. METHODS: Twenty-four neurologically-intact adults (age:55-75 years) were recruited for this test-retest study...
2017: PloS One
https://www.readbyqxmd.com/read/28906346/time-course-of-changes-in-corticospinal-excitability-after-short-term-forearm-hand-immobilization
#12
Tetsuya Karita, Akihiro Matsuura, Yoshihiro Kondo, Kohta Tomimura, Nao Nakada, Futoshi Mori
The short-term joint immobilization induces a decrease of corticospinal excitability; however, detailed time course of the immobilization-induced central nervous system changes and their extent have not yet been clarified. To evaluate the time course of changes in corticospinal excitability during forearm/hand immobilization for 24 h and investigate the effect on muscle strength, adhesive casting tape was used to immobilize the nondominant forearm/hand. The amplitude of the motor-evoked potential of the flexor pollicis brevis muscle induced by transcranial magnetic stimulation was measured during immobilization and after cast removal...
September 12, 2017: Neuroreport
https://www.readbyqxmd.com/read/28904571/transcranial-magnetic-stimulation-as-an-additional-diagnostic-tool-in-children-with-acute-inflammatory-demyelinating-polyneuropathy
#13
Voitenkov Vladislav Voitenkov, Klimkin Andrey, Skripchenko Natalia, Aksenova Anastasia
CONTEXT: The diagnosis of polyneuropathy may be challenging at the early stages of the disease. Despite electromyography (EMG) efficacy in the establishment of polyneuropathy diagnosis, in some cases, results are dubious and neurophysiologists may implement additional techniques to ensure that conduction is affected. AIMS: The aim of the study was to evaluate motor-evoked potential (MEP) characteristics in children with acute inflammatory demyelinating polyneuropathy (AIDP)...
April 2017: Journal of Pediatric Neurosciences
https://www.readbyqxmd.com/read/28900413/impaired-cerebellum-to-primary-motor-cortex-associative-plasticity-in-parkinson-s-disease-and-spinocerebellar-ataxia-type-3
#14
Ming-Kuei Lu, Jui-Cheng Chen, Chun-Ming Chen, Jeng-Ren Duann, Ulf Ziemann, Chon-Haw Tsai
BACKGROUND: Functional perturbation of the cerebellum (CB)-motor cortex (M1) interactions may underlie pathophysiology of movement disorders, such as Parkinson's disease (PD) and spinocerebellar ataxia type 3 (SCA3). Recently, M1 motor excitability can be bidirectionally modulated in young subjects by corticocortical paired associative stimulation (PAS) on CB and contralateral M1 with transcranial magnetic stimulation (TMS), probably through the cerebello-dentato-thalamo-cortical (CDTC) circuit...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28899835/successful-treatment-by-microvascular-decompression-surgery-of-a-patient-with-hemiparesis-due-to-vertebral-artery-compression-of-the-medulla-oblongata-a-case-report-and-literature-review
#15
Jibin Ren, Hongtao Sun, Yunfeng Diao, Xuegang Niu, Hang Wang, Zhengjun Wei, Fei Yuan
Little literature is available on hemiparesis caused by vascular medullary compression, which may occur as a result of dolichoectasia of the vertebrobasilar arterial system. In this paper, we report a case of vertebral artery compression of the medulla oblongata in a 67-year old woman. The patient was hypertensive and developed hemiparesis and intermittent spasms for five years, which became worsened for one year. Cranial nerve MRI showed compression of the medulla oblongata by the left vertebral artery. Motor evoked potential (MEP) examination showed abnormal conduction of MEPs of bilateral toe abductors...
September 9, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28894145/characterization-of-volume-based-changes-in-cortical-auditory-evoked-potentials-and-prepulse-inhibition
#16
Thomas Potter, Sheng Li, Thinh Nguyen, Trac Nguyen, Nuri Ince, Yingchun Zhang
The auditory evoked startle reflex is a conserved response resulting in neurological and motor activity. The presence of a mild prepulse immediately before the main pulse inhibits startle responses, though the mechanism for this remains unknown. In this study, the electroencephalography (EEG) data recorded from 15 subjects was analyzed to study the N1 and P2 components of cortical auditory evoked potentials (CAEPs) evoked by 70, 80, 90, 100, and 110 dB stimuli both in the presence and absence of 70 dB prepulses...
September 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28887545/human-to-human-closed-loop-control-based-on-brain-to-brain-interface-and-muscle-to-muscle-interface
#17
M Ebrahim M Mashat, Guangye Li, Dingguo Zhang
Novel communication techniques have always been fascinating for humankind. This pilot study presents an approach to human interaction by combining direct brain-to-brain interface (BBI) and muscle-to-muscle interface (MMI) in a closed-loop pattern. In this system, artificial paths (data flows) functionally connect natural paths (nerves). The intention from one subject (sender) is recognized using electroencephalography (EEG) based brain-computer interface (BCI), which is sent out to trigger transcranial magnetic stimulation (TMS) on the other subject (receiver) and induce hand motion; meanwhile TMS results in a significant change on the motor evoked potentials (MEP) recorded by electromyography (EMG) of the receiver's arm, which triggers functional electrical stimulation (FES) applied to the sender's arm and generates hand motion...
September 8, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28885782/evaluation-of-pulse-width-of-spinal-nerve-stimulation-in-a-rat-model-of-bladder-micturition-reflex
#18
Xin Su, Heather A Simenson, David A Dinsmoor, Heather D Orser
OBJECTIVES: The spinal nerve stimulation (SNS) evoked motor threshold (Tmot ) response across different pulse-widths (PWs) was first explored and a subset of selected stimulation PWs were further assessed with respect to bladder reflex contraction (BRC). MATERIALS AND METHODS: In anesthetized female rats, wire electrodes were placed under each of the L6 spinal nerves to produce bilateral SNS. The relationship of Tmot response with PW was analyzed using a monoexponential nonlinear regression...
September 8, 2017: Neuromodulation: Journal of the International Neuromodulation Society
https://www.readbyqxmd.com/read/28881588/experimental-study-of-brachial-plexus-and-vessel-compression-evaluation-of-combined-central-and-peripheral-electrodiagnostic-approach
#19
Chaoqun Yang, Jianguang Xu, Jie Chen, Shulin Li, Yu Cao, Yi Zhu, Lei Xu
INTRODUCTION: We sought to investigate the reliability of a new electrodiagnostic method for identifying Electrodiagnosis of Brachial Plexus & Vessel Compression Syndrome (BPVCS) in rats that involves the application of transcranial electrical stimulation motor evoked potentials (TES-MEPs) combined with peripheral nerve stimulation compound muscle action potentials (PNS-CMAPs). RESULTS: The latencies of the TES-MEP and PNS-CMAP were initially elongated in the 8-week group...
August 1, 2017: Oncotarget
https://www.readbyqxmd.com/read/28879576/effects-of-acute-resistance-training-modality-on-corticospinal-excitability-intra-cortical-and-neuromuscular-responses
#20
Christopher Latella, Wei-Peng Teo, Dale Harris, Brendan Major, Dan VanderWesthuizen, Ashlee M Hendy
OBJECTIVE: Although neural adaptations from strength training are known to occur, the acute responses associated with heavy-strength (HST) and hypertrophy training (HYT) remain unclear. Therefore, we aimed to compare the acute behaviour of corticospinal responses following a single session of HST vs HYT over a 72-h period. METHODS: Fourteen participants completed a random counterbalanced, crossover study that consisted of a single HST session [5 sets × 3 repetition maximum (RM)], a HYT session (3 sets × 12 RM) of the leg extensors and a control session (CON)...
September 6, 2017: European Journal of Applied Physiology
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