Document Detail

Offline comparison of spatial filters for two-dimensional movement control with noninvasive field potentials.
MedLine Citation:
PMID:  21712569     Owner:  NLM     Status:  Publisher    
Paralyzed individuals can control the movement of an assistive device using changes in electroencephalographic (EEG) power resulting from attempted movements. Simultaneous, proportional control of two-dimensional (2D) device movements can be achieved with the concurrent modulation of brain activity that is associated with the attempted movement and rest of two independent body parts. Movement control may be improved by spatial filtering methods that recombine raw EEGs to form new signals with more focused information about the underlying brain activity. This study compared spatial filters offline for improving simultaneous proportional 2D movement commands from EEGs. Filtering options evaluated were common average referencing, Laplacian, independent component analysis, principle component analysis, and two novel ways of applying common spatial pattern (CSP) analysis. CSP analysis is a supervised algorithm that optimally recombines EEGs collected under two known conditions. Both CSP options resulted in more accurate movement prediction than the other filtering options. CSP was particularly advantageous when separating EEGs associated with neighboring or overlapping areas on the motor homunculus. Finally, CSP performed well using smaller subsets of filtered signals, thus making CSP practical and efficient for simultaneous 2D control. A 2D online cursor control example using CSP filtering is included to show CSP's utility.
S T Foldes; D M Taylor
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-6-28
Journal Detail:
Title:  Journal of neural engineering     Volume:  8     ISSN:  1741-2552     ISO Abbreviation:  -     Publication Date:  2011 Jun 
Date Detail:
Created Date:  2011-6-29     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101217933     Medline TA:  J Neural Eng     Country:  -    
Other Details:
Languages:  ENG     Pagination:  046022     Citation Subset:  -    
Department of Biomedical Engineering, Case Western Reserve University, Cleveland, OH 44106, USA. Cleveland Functional Electrical Stimulation (FES) Center of Excellence, Louis Stokes VA Medical Center, Cleveland, OH 44106, USA.
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