title: Comparison of Features for Movement Prediction from Single-Trial Movement-Related Cortical Potentials in Healthy Subjects and Stroke Patients.
abstract: Detection of movement intention from the movement-related cortical potential (MRCP) derived from the electroencephalogram (EEG) signals has shown to be important in combination with assistive devices for effective neurofeedback in rehabilitation. In this study, we compare time and frequency domain features to detect movement intention from EEG signals prior to movement execution. Data were recoded from 24 able-bodied subjects, 12 performing real movements, and 12 performing imaginary movements. Furthermore, six stroke patients with lower limb paresis were included. Temporal and spectral features were investigated in combination with linear discriminant analysis and compared with template matching. The results showed that spectral features were best suited for differentiating between movement intention and noise across different tasks. The ensemble average across tasks when using spectral features was (error = 3.4 ± 0.8%, sensitivity = 97.2 ± 0.9%, and specificity = 97 ± 1%) significantly better (P < 0.01) than temporal features (error = 15 ± 1.4%, sensitivity: 85 ± 1.3%, and specificity: 84 ± 2%). The proposed approach also (error = 3.4 ± 0.8%) outperformed template matching (error = 26.9 ± 2.3%) significantly (P > 0.001). Results imply that frequency information is important for detecting movement intention, which is promising for the application of this approach to provide patient-driven real-time neurofeedback.
authors.affiliation: Department of Health Science and Technology, Aalborg University, 9220 Aalborg, Denmark.
authors.forename: Ernest Nlandu
authors.initials: EN
authors.lastname: Kamavuako
authors.affiliation: Department of Health Science and Technology, Aalborg University, 9220 Aalborg, Denmark.
authors.forename: Mads
authors.initials: M
authors.lastname: Jochumsen
authors.affiliation: Department of Health Science and Technology, Aalborg University, 9220 Aalborg, Denmark ; Center for Chiropractic Research, New Zealand College of Chiropractic, Auckland 1060, New Zealand ; Faculty of Health & Environmental Sciences, Health & Rehabilitation Research Institute, AUT University, Auckland 1060, New Zealand.
authors.forename: Imran Khan
authors.initials: IK
authors.lastname: Niazi
authors.affiliation: Department of Health Science and Technology, Aalborg University, 9220 Aalborg, Denmark.
authors.forename: Kim
authors.initials: K
authors.lastname: Dremstrup
mesh_terms: D000328:Adult; D000368:Aged; D000465:Algorithms; D002540:Cerebral Cortex / Q000502:physiology*; D016002:Discriminant Analysis; D004569:Electroencephalography; D005071:Evoked Potentials / Q000502:physiology*; D005260:Female; D064368:Healthy Volunteers; D006801:Humans; D007092:Imagination / Q000502:physiology; D033182:Intention; D008297:Male; D008875:Middle Aged; D009068:Movement / Q000502:physiology*; D010291:Paresis / Q000503:physiopathology; D012815:Signal Processing, Computer-Assisted; D020521:Stroke / Q000503:physiopathology*