Inclusion Criteria:  Informed consent People aged between 18 and 50 years People free of acute or chronical diseases limiting their handwriting capabilities (e.g. Parkinson, hand/arm amputee) Education level: at least high school diploma People using a handwriting pen > once per week Sufficient German language skills (min. B2 level - Questionnaire language)  Exclusion Criteria:  People with mental disorders limiting their writing performance People with chronical fatigue syndrome People incapable of concentrating on tasks for more than 30 minutes Non-corrected visual disturbances