Inclusion Criteria:  Age at study entry ≥ 18 years Stroke (ischemic stroke, non-traumatic intracerebral haemorrhage, subarachnoidal haemorrhage) Incomplete arm paresis (Motricity Index, arm score >1 [Min] and < 100 [Max]) or Visuospatial neglect (clinical signs and NET subtest "star cancellation" score < 50) Candidate able to consent and provides informed consent or legal representative provides informed consent  Exclusion Criteria:  Pregnant or breast feeding Obliged to live in an institution by law or public authority With case presentation arm paresis: another condition that causes arm paresis is present With case presentation visuospatial neglect: another condition that causes a relevant visual-perceptual deficit that cannot be compensated is present; exception: homonymous visual field deficits are not an exclusion criterion