Movement-associated cortical potentials in unilateral cerebral lesions

Shibasaki, Hiroshi

doi:10.1007/bf00312541

Cited by 15 publications

(4 citation statements)

References 22 publications

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“…MRPs constitute a waveform that is obtained by taking the ÔaverageÕ EEG, in terms of onset of movement or myo-electrical activity of the prime mover [3,4]. Many studies demonstrated topographical alterations of some MRP components during the recovery period after a stroke [5][6][7][8][9][10][11]. The analysis of MRP, however, presents methodological difficulties because of its low signal to noise ratio [12].…”

Section: Introductionmentioning

confidence: 99%

Symmetry of post‐movement beta‐ERS and motor recovery from stroke: a low‐resolution EEG pilot study

Eder

Sokić²,

Covickovic-Sternic³

et al. 2006

Euro J of Neurology

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The inter-hemispheric symmetry of electroencephalographic (EEG) post-movement beta-event-related synchronization (PMBS) after movements on a drawing board was studied in eight acute stroke subjects with mild hemiparesis and eight normal subjects. A follow-up testing was conducted 3 months after the initial recordings with a twofold purpose: (1) to validate the reproducibility of the experimental protocol in normal subjects; and (2) to study changes of inter-hemispheric PMBS-symmetry as a response to recovery of motor function. PMBS values were calculated and their topographic distributions illustrated at various time instances following movement offset. Significant PMBS patterns were present in all normal subjects, with only minor differences within consecutive recordings. The side of hemiparesis in acute stroke subjects could be distinguished (P = 0.04) on the basis of the signed symmetry index, a quantitative measure of lateralization. The follow-up testing on three recovered stroke subjects revealed a trend of changes in the lateralization towards the contralateral side of movement, an indication that the cortical organization of movement following recovery turned out as reported for normal subjects. Further clinical investigations need to be carried out to evaluate the relationship between recovery and PMBS symmetry on a large number of subjects, using the method presented here.

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Section: Introductionmentioning

confidence: 99%

Symmetry of post‐movement beta‐ERS and motor recovery from stroke: a low‐resolution EEG pilot study

Eder

Sokić²,

Covickovic-Sternic³

et al. 2006

Euro J of Neurology

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“…11 However, only few studies exist that examined hemiparetic patients. [12][13][14] Moreover, sample sizes were small, or patients with brain lesions of different etiologies were examined.…”

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confidence: 99%

Reorganization of Motor Execution Rather Than Preparation in Poststroke Hemiparesis

Wiese

Stude

Sarge

et al. 2005

Stroke

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Background and Purpose-The aim of the present study was to examine movement-related potentials (MRPs) in patients in the "chronic" stage after cortical stroke with recovered hemiparesis compared with healthy control subjects. Methods-Right index finger MRPs were derived from 12 patients Ն1 year after infarction in the territory of the left middle cerebral artery as well as from 12 control subjects. MRP components were compared between groups. Results-In the patient group, the component directly preceding movement onset (negative slope [NS]) was significantly reduced over the lesioned hemisphere contralateral to the movement. Furthermore, increased motor potentials (MPs) were observed over the contralesional hemisphere during movement execution. No changes in the early MRP (Bereitschaftspotential) reflecting movement preparation were found. Conclusions-Because the NS is supposed to be generated by the primary motor cortex, the decreased component over the lesioned hemisphere is interpreted to represent impaired contralateral M1 functioning in stroke patients. Contralesional activity has been reported as a probable sign of brain plasticity by functional imaging studies. Our results broaden these findings, giving new insights into the temporal course of movement-related brain activity in recovered cortical stroke patients. The data point to a functional reorganization of motor execution rather than preparation in poststroke hemiparesis.

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“…Abschlicßond sei noch erwähnt, daß unsere Ergebnisse nicht im Widerspruch zu den bereits bekannten Veröffentlichungen (7, 16,18). stchen.…”

Section: Movement -Helated Potentials -Readiness Potenlials -Vobntaryunclassified

Prämotorische Potentiale bei Halbseitengelähmten

Gebhardt¹,

Gutjahr²,

Hinrichs³

1993

Klin Neurophysiol

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Movement-associated cortical potentials in unilateral cerebral lesions

Cited by 15 publications

References 22 publications

Symmetry of post‐movement beta‐ERS and motor recovery from stroke: a low‐resolution EEG pilot study

Symmetry of post‐movement beta‐ERS and motor recovery from stroke: a low‐resolution EEG pilot study

Reorganization of Motor Execution Rather Than Preparation in Poststroke Hemiparesis

Prämotorische Potentiale bei Halbseitengelähmten

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