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Title

EEG alpha band synchrony predicts cognitive and motor performance in patients with ischemic stroke

Authors
Gillabert, Nicole
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Published in Behavioural Neurology. 2013, vol. 26, no. 3, p. 187-9
Abstract Functional brain networks are known to be affected by focal brain lesions. However, the clinical relevance of these changes remains unclear. This study assesses resting-state functional connectivity (FC) with electroencephalography (EEG) and relates observed topography of FC to cognitive and motor deficits in patients three months after ischemic stroke. Twenty patients (mean age 61.3 years, range 37-80, 9 females) and nineteen age-matched healthy participants (mean age 66.7 years, range 36-88, 13 females) underwent a ten-minute EEG-resting state examination. The neural oscillations at each grey matter voxel were reconstructed using an adaptive spatial filter and imaginary component of coherence (IC) was calculated as an index of FC. Maps representing mean connectivity value at each voxel were correlated with the clinical data. Compared to healthy controls, alpha band IC of stroke patients was locally reduced in brain regions critical to observed behavioral deficits. A voxel-wise Pearson correlation of clinical performances with FC yielded maps of the neural structures implicated in motor, language, and executive function. This correlation was again specific to alpha band coherence. Ischemic lesions decrease the synchrony of alpha band oscillations between affected brain regions and the rest of the brain. This decrease is linearly related to cognitive and motor deficits observed in the patients.
Keywords AgedAlpha Rhythm/physiologyAttention/physiologyBrain Ischemia/psychologyCognition/physiologyElectroencephalography Phase SynchronizationExecutive FunctionFemaleFunctional Laterality/physiologyHumansMaleMemory, Short-Term/physiologyMiddle AgedMotor Skills/physiologyNerve Net/physiologyNervous System Diseases/etiology/psychologyPredictive Value of TestsPsychomotor Performance/physiologyStroke/psychologyVerbal Behavior/physiology
Identifiers
PMID: 22713421
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Structures
Research groups Lésions cérébrales et attention spatiale (705)
Amnésie (289)
Neuroréhabilitation assistée par imagerie (910)
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DUBOVIK, Sviatlana et al. EEG alpha band synchrony predicts cognitive and motor performance in patients with ischemic stroke. In: Behavioural Neurology, 2013, vol. 26, n° 3, p. 187-9. https://archive-ouverte.unige.ch/unige:39280

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Deposited on : 2014-08-07

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