Feasibility of a new application of noninvasive Brain Computer Interface (BCI): a case study of training for recovery of volitional motor control after stroke.
OBJECTIVE
A large proportion of individuals with stroke have persistent deficits for which current interventions have not restored normal motor behavior. Noninvasive brain computer interfaces (BCIs) have potential advantages for restoration of function. There are also potential advantages for combining BCI with functional electrical stimulation (FES). We tested the feasibility of combined BCI + FES for motor learning after stroke.


METHODS
The participant was a 43-year-old woman who was 10 months post-stroke. She was unable to produce isolated movement of any of the digits of her involved hand. With effort she exhibited simultaneous mass hyperextension of metacarpal phalangeal joints of all four fingers and thumb with simultaneous flexion of proximal interphalangeal and distal interphalangeal joints of all fingers.


METHODS
Brain signals from the lesioned hemisphere were used to trigger FES for movement practice. The BCI + FES intervention consisted of trials of either attempted finger movement and relax conditions or imagined finger movement and relax conditions. The training was performed three times per week for three weeks (nine sessions total).


RESULTS
: The participant exhibited highly accurate control of brain signal in the first session for attempted movement (97%), imagined movement (83%), and some difficulties with attempted relaxation (65%). By session 6, control of relaxation (deactivation of brain signal) improved to >80%. After nine sessions (three per week) of BCI + FES intervention, the participant demonstrated recovery of volitional isolated index finger extension.


CONCLUSIONS
BCI + FES training for motor learning after stroke was feasible. A highly accurate brain signal control was achieved, and this signal could be reliably used to trigger the FES device for isolated index finger extension. With training, volitional control of isolated finger extension was attained in a small number of sessions. The source of motor recovery could be attributable to BCI, FES, combined BCI + FES, or whole arm or hand motor task practice.
Daly
Janis J
JJ
Cognitive and Motor Learning Research Program, Louis Stokes Cleveland Department of Veterans Affairs Medical Center, Ohio, USA.
Cheng
Roger
R
Rogers
Jean
J
Litinas
Krisanne
K
Hrovat
Kenneth
K
Dohring
Mark
M
D000328:Adult; D001921:Brain / Q000503:physiopathology*; D001931:Brain Mapping; D004185:Disability Evaluation; D004599:Electric Stimulation Therapy; D004569:Electroencephalography; D005260:Female; D006225:Hand / Q000503:physiopathology*; D006801:Humans; D008279:Magnetic Resonance Imaging; D008606:Mental Processes; D020521:Stroke / Q000503:physiopathology; D000071939:Stroke Rehabilitation; D014584:User-Computer Interface