Inclusion Criteria:  (Group 1 = mNCD) clinical diagnosis of 'Mild Neurocognitive Disorder' (mNCD) according to the International Classification of Diseases 11th Revision (ICD-XI) OR (Group 2 = sMCI) patients screened for mild cognitive impairment (sMCI) according to the following criteria: (a) informant (i.e. healthcare professionals)-based suspicion of MCI confirmed by (b) an objective screening of MCI based on the German Version of the Quick Mild Cognitive Impairment Screen with (b1) a recommended cut-off score for cognitive impairment (MCI or dementia) of < 62/100, while (b2) not falling below the cut-off score for dementia (i.e. < 45/100), while (c) activities of daily living remain intact. fully vaccinated against coronavirus (SARS-CoV-2) with a Federal Office of Public Health (FOPH)-approved mRNA vaccine German speaking age ≥ 50 years able to stand at least for 10 min without assistance  Exclusion Criteria:  mobility impairments (i.e. gait, balance) that prevent experiment participation presence of additional neurological disorders (i.e. epilepsy, stroke, multiple sclerosis, Parkinson's disease, brain tumors, or traumatic disorders of the nervous system) presence of any other unstable or uncontrolled diseases  additional Covid-19 specific exclusion criteria (according to the Federal Office of Public Health):  high blood pressure (self-reported; systolic ≥ 140 mmHg and/or Diastolic ≥ 90 mmHg) Chronic respiratory condition Diabetes Condition or therapy that weakens the immune system Cardiovascular Disease Cancer (present and/or under treatment) Serious obesity (BMI ≥ 40 kg/m2)