Results 151 to 160 of about 107,978 (189)

Plasticity and Primary Motor Cortex

Annual Review of Neuroscience, 2000
One fundamental function of primary motor cortex (MI) is to control voluntary movements. Recent evidence suggests that this role emerges from distributed networks rather than discrete representations and that in adult mammals these networks are capable of modification.
Jerome N. Sanes, John P. Donoghue
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Primary motor cortex isolation: complete paralysis with preserved primary motor cortex

Journal of the Neurological Sciences, 1998
We present a left-sided hemiplegic patient with a cerebrovascular lesion involving the medial part of the right frontal and parietal lobes and the corpus callosum, but sparing the hand area of right primary motor cortex (M1). Several studies using transcranial magnetic stimulation demonstrated functional integrity of the efferent pathways from the ...
Masahiko Suzuki, Emiko Kojima, Katsuyuki Sakai, Yoshikazu Ugawa, Ichiro Kanazawa, Yasuo Terao, Ritsuko Hanajima   +6 more
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Somatotopy in the ipsilateral primary motor cortex

NeuroReport, 2002
Conflicting reports exist about the occurrence, reliability and localization of activation in the ipsilateral primary motor cortex (M1). We re-examined this issue with functional magnetic resonance imaging in 12 volunteers performing right hand, finger, wrist, elbow, foot and tongue movements in two separate sessions.
Hatem Alkadhi, Spyros Kollias, Marie-Claude Hepp-Reymond, Sabina Hotz Boendermaker, Gerard Crelier   +4 more
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Postnatal Development of the Motor Representation in Primary Motor Cortex

Journal of Neurophysiology, 2000
The purpose of this study was to examine when the muscles and joints of the forelimb become represented in primary motor cortex (M1) during postnatal life and how local representation patterns change. We examined these questions in cats that were anesthetized (45–90 days, n = 14; adults, n = 3) and awake ( n = 4; 52–86 days).
Samit Chakrabarty, John H. Martin
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Early consolidation in human primary motor cortex [PDF]

Nature, 2002
Behavioural studies indicate that a newly acquired motor skill is rapidly consolidated from an initially unstable state to a more stable state, whereas neuroimaging studies demonstrate that the brain engages new regions for performance of the task as a result of this consolidation.
Nguyet Dang, Mark Hallett, Wolf Muellbacher, Joerg Wissel, Markus Kofler, Ulf Ziemann, Ulf Ziemann, Babak Boroojerdi, Werner Poewe, Stefano Facchini   +9 more
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Primary motor cortex hyperexcitability in Fabry’s disease

Clinical Neurophysiology, 2013
Involvement of pyramidal cells and/or changes in excitability of brain areas remote from an ischemic stroke has been demonstrated. Since in Fabry disease (FD), specific cerebrovascular lesions are present, we thought to investigate motor cortex excitability, using transcranial magnetic stimulation.Resting (RMT) and active (AMT) motor threshold, input ...
Ortu E, Fancellu L, Sau G, Falchi P, Traccis S, PES, Giovanni Mario, GANAU, Antonello, SECHI, Gianpietro   +7 more
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TMS: A navigator for NIRS of the primary motor cortex?

Journal of Neuroscience Methods, 2011
Near-infrared spectroscopy (NIRS) is a non-invasive optical imaging technique, which is increasingly used to measure hemodynamic responses in the motor cortex. The location at which the NIRS optodes are placed on the skull is a major factor in measuring the hemodynamic responses optimally.
Koenraadt, K.L.M., Munneke, M., Munneke, M., Munneke, M., Duysens, J.E.J., Keijsers, N.L.W.   +5 more
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A Model of Reaching Dynamics in Primary Motor Cortex [PDF]

Journal of Cognitive Neuroscience, 1998
Features of virtually all voluntary movements are represented in the primary motor cortex. The movements can be ongoing, imminent, delayed, or imagined. Our goal was to investigate the dynamics of movement representation in the motor cortex. To do this we trained a fully recurrent neural network to continually output the direction and magnitude of ...
Sohie Lee Moody, David Zipser
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Is the human primary motor cortex involved in motor imagery?

Cognitive Brain Research, 2004
Participation of the primary motor cortex (M1) in motor imagery was addressed using functional magnetic resonance imaging at 2.0 T and 2 x 2 x 4 mm3 resolution in six right-handed subjects. Paradigms comprised visually cued execution and imagination of a sequential finger-to-thumb opposition task (12 s) contrasted with motor rest and visual imagery (18
Peter Dechent, Klaus-Dietmar Merboldt, Jens Frahm   +2 more
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Ipsilateral involvement of primary motor cortex during motor imagery

European Journal of Neuroscience, 2000
AbstractTo investigate whether motor imagery involves ipsilateral cortical regions, we studied haemodynamic changes in portions of the motor cortex of 14 right‐handed volunteers during actual motor performance (MP) and kinesthetic motor imagery (MI) of simple sequences of unilateral left or right finger movements, using functional magnetic resonance ...
PORRO, Carlo Adolfo, Cettolo, V., Francescato, M. P., BARALDI, Patrizia   +3 more
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