نتایج جستجو برای: intracortical

تعداد نتایج: 2386  

2014
David Andrew Rice Peter John McNair Gwyn Nancy Lewis Nicola Dalbeth

INTRODUCTION Marked weakness of the quadriceps muscles is typically observed following injury, surgery or pathology affecting the knee joint. This is partly due to ongoing neural inhibition that prevents the central nervous system from fully activating the quadriceps, a process known as arthrogenic muscle inhibition (AMI). This study aimed to further investigate the mechanisms underlying AMI by...

Journal: :Journal of athletic training 2011
Louis De Beaumont David Mongeon Sébastien Tremblay Julie Messier François Prince Suzanne Leclerc Maryse Lassonde Hugo Théoret

CONTEXT The known detrimental effects of sport concussions on motor system function include balance problems, slowed motor execution, and abnormal motor cortex excitability. OBJECTIVE To assess whether these concussion-related alterations of motor system function are still evident in collegiate football players who sustained concussions but returned to competition more than 9 months before te...

Journal: :Clinics (Sao Paulo, Brazil) 2008
Adriana B. Conforto Renata Laurenti dos Santos Suzete Nascimento Farias Suely Kazue Nagahashi Marie Nadia Mangini Leonardo G. Cohen

INTRODUCTION Somatosensory stimulation of the paretic upper limb enhances motor performance and excitability in the affected hemisphere, and increases activity in the unaffected hemisphere, in chronic stroke patients. We tested the hypothesis that somatosensory stimulation of the paretic hand would lead to changes in excitability of the unaffected hemisphere in these patients, and we investigat...

Journal: :Journal of neurophysiology 2003
Young H Sohn Nguyet Dang Mark Hallett

To investigate the effect of negative motor imagery on corticospinal excitability, we performed transcranial magnetic stimulation (TMS) studies in seven healthy subjects during imagination of suppressing movements. Subjects were asked to imagine suppression of TMS-induced twitching movement of their nondominant left hands by attempting to increase the amount of relaxation after receiving an aud...

Journal: :Magnetic resonance in medicine 2008
Sung-Hong Park Kazuto Masamoto Kristy Hendrich Iwao Kanno Seong-Gi Kim

Rat brain vasculature was imaged at 9.4T with blood oxygenation level-dependent (BOLD) microscopy. Data were acquired without exogenous contrast agent in <35 min using 3D gradient-echo imaging with 78-microm isotropic resolution. Detailed vascular patterns including intracortical veins and some branches were observed in simple magnitude-contrast data acquired at an experimentally optimized echo...

Journal: :Stroke 2011
Jodi D Edwards Sean K Meehan Adrian R Levy Philip A Teal Meghan A Linsdell Lara A Boyd

BACKGROUND AND PURPOSE A transient ischemic attack (TIA) is a brief ischemic episode characterized by rapid clinical resolution and not associated with permanent cerebral infarction. Whether changes in intracortical excitability persist and are related to clinical predictors of stroke risk after TIA remains unknown. METHODS Participants were individuals with clinically resolved motor TIA with...

Journal: :The Journal of neuroscience : the official journal of the Society for Neuroscience 2014
Zhen Ni Carolyn Gunraj Paramjit Kailey Robin F H Cash Robert Chen

Inductions of long-term potentiation (LTP) and depression (LTD) are modulated if they are preceded by a priming protocol, in a manner consistent with metaplasticity. Depotentiation refers to reversal of LTP by a subsequent protocol that has no effect by itself. Paired associative stimulation (PAS) at interstimulus interval of 25 ms (PAS25) and 10 ms (PAS10) produces spike timing-dependent LTP-l...

Journal: :The Journal of comparative neurology 2000
M A Silver M P Stryker

Two days of monocular deprivation (MD) of kittens during a critical period of development is known to produce a loss of visual responses in the primary visual cortex to stimulation of the nondeprived eye, and 7 days of deprivation results in retraction of axon branches and loss of presynaptic sites from deprived-eye geniculocortical arbors. The rapid loss of responsiveness to deprived-eye visua...

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