Motor imagery learning across a sequence of trials in stroke patients

Title
Motor imagery learning across a sequence of trials in stroke patients
Authors
김래현이민지박창현임창환김정훈권규현장원혁김연희
Keywords
Motor imagery; stroke; electroencephalography; brain?computer interfaces; SPM
Issue Date
2016-08
Publisher
Restorative neurology and neuroscience
Citation
VOL 34, 635-645
Abstract
PURPOSE: In brain-computer interfaces (BCIs), electrical brain signals during motor imagery are utilized as commands connecting the brain to a computer. To use BCI in patients with stroke, unique brain signal changes should be characterized during motor imagery process. This study aimed to examine the trial-dependent motor-imagery-related activities in stroke patients. METHODS: During the recording of electroencephalography (EEG) signals, 12 chronic stroke patients and 11 age-matched healthy controls performed motor imagery finger tapping at 1.3  sec intervals. Trial-dependent brain signal changes were assessed by analysis of the mu and beta bands. RESULTS: Neuronal activity in healthy controls was observed over bilateral hemispheres at the mu and beta bands regardless of changes in the trials, whereas neuronal activity in stroke patients was mainly seen over the ipsilesional hemisphere at the beta band. With progression to repeated trials, healthy controls displayed a decrease in cortical activity in the contralateral hemisphere at the mu band and in bilateral hemispheres at the beta band. In contrast, stroke patients showed a decreasing trend in cortical activity only over the ipsilesional hemisphere at the beta band. CONCLUSIONS: Trial-dependent changes during motor imagery learning presented in a different manner in stroke patients. Understanding motor imagery learning in stroke patients is crucial for enhancing the effectiveness of motor-imagery-based BCIs.
URI
http://pubs.kist.re.kr/handle/201004/59802
ISSN
09226028
Appears in Collections:
KIST Publication > Article
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