Motor Imagery BCI Rehabilitation After Stroke

Inclusion Criteria: \> 6 months since first time stroke onset and with remaining hemiparesis in upper extremity; able to participate fully in the intervention, able to perform Functional Magnetic Resonance Imaging (fMRI); able to passively extend the wrist 15 degrees and extend fingers fully with a neutral position of the wrist. In addition, participants need to be able to voluntarily control the power of their grip when requested according to the Visuomotor force tracking method and/or according to the clinical assessment of a therapist (while holding the patient´s hand). According to the Fugl- Meyer Upper Extremity (UE) scale participants should accomplish \<14 points on the hand subscale and \<2 points in finger flexion and extension (C) in addition to \< 47 points on the total motor score (equivalent to moderate disability in the upper extremity. Exclusion Criteria: * other neurological or musculoskeletal disease/injury, or contagious disease. * If the research person is regularly treated with botulinum toxin in the upper extremity, 3 weeks should have passed before the first baseline assessment. * current or history of epilepsy, * severe hearing or visual impairments, * metal implants in the brain/skull cochlear implants, * any implanted neurostimulator, cardiac pacemaker or cardiac implants of metal, infusion device, * any other neurological disorder, * pregnancy, * current or history of severe psychiatric disorder with need for pharmacological treatment