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Title: Stable ratio of ipsilateral to contralateral sensory motor cortex activity despite varying effort and peripheral nerve block.
Austin Authors: Archer, John S ;Abbott, David F ;Jackson, Graeme D 
Affiliation: Brain Research Institute, Austin and Repatriation Medical Centre, Banksia Street, Vic. 3081, Heidelberg West, Australia
Issue Date: 1-Jan-2004
Publication information: Journal of Clinical Neuroscience : Official Journal of the Neurosurgical Society of Australasia; 11(1): 46-52
Abstract: Ipsilateral sensory motor cortex (SMC) activation can occur during hand movements following cerebral injury. We studied the effect of increasing task difficulty and temporary peripheral paralysis on patterns of motor system activation.Six healthy subjects completed a functional MRI paradigm of right finger abduction with four stages; light resistance, strong resistance, imagined movement and attempted abduction after ulnar nerve blockade. Activation maps compared images acquired during rest and task, while region of interest analysis measured numbers of activated pixels.All subjects showed some ipsilateral SMC activation. Across all subjects and all tasks involving hand movement, contralateral activation was proportional to ipsilateral activation (2.1:1; r=0.86).The relationship between ipsilateral and contralateral SMC activation remained stable despite differing effort or hand paralysis. The contralateral and ipsilateral SMC appear to act in a coordinated fashion during unilateral hand movements.
Gov't Doc #: 14642365
Type: Journal Article
Subjects: Adult
Brain Mapping
Functional Laterality.physiology
Image Processing, Computer-Assisted
Magnetic Resonance Imaging.methods
Motor Cortex.blood supply.physiology
Nerve Block.methods
Peripheral Nerves.drug effects.physiology
Physical Exertion.physiology
Somatosensory Cortex.blood supply.physiology
Appears in Collections:Journal articles

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