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