COMPuter-assisted Self-training to Improve EXecutive Function

Who May Qualify: - A diagnose of stroke, cardiac arrest or Parkinson's disease. - Aged 18 years or older. - Impaired working memory measured with CABPad working memory test, cut off for inclusion: 5 symbols or less backwards - Computer and internet access at home. - Providing willing to sign a consent form. Inclusion criteria specific for stroke - Inclusion within 6 months post-stroke - Stroke confirmed by clinical findings and imaging, both AIS and ICH is allowed. - Initial stroke severity \>/= NIHSS 3. Inclusion criteria specific for cardiac arrest • Inclusion within 6 months post ictus. Inclusion criteria specific for Parkinson's disease - Clinical diagnosis of PD. - Anti-parkinsonian medical treatment (dopaminergic or other). Who Should NOT Join This Trial: - willing to sign a consent form not provided - Other neurological or psychiatric disease which is expected to influence the patient's ability to participate in the trial according to the investigator - Not able to participate according to investigator Exclusion criteria specific for stroke - Patients with massive anosognosia for executive dysfunction or patients with no subjective feeling of executive dysfunction (Patient sustains total denial of executive symptoms over time) - Patients with severe aphasia, in which it is unclear whether the patient's performance on a neuropsychological test-battery is due to aphasia and not executive dysfunction. Exclusion criteria specific for cardiac arrest • None Exclusion criteria specific for PD • Diagnosis of PD Dementia according to the MDS PD Dementia criteria Always talk to your doctor about whether this trial is right for you.