Inclusion criteria

Inclusion criteria are checked during an initial telephone interview once the participants register to the study via a contact form. Participants should be willing to participate in the planned follow-up examinations. They should have normal or corrected-to-normal vision and hearing and fulfill standard inclusion criteria for blood donation and MRI measurements.

Exclusion criteria were history of diseases such as:

• neurological diseases, e.g. stroke, dementia, Parkinson disease
• cardiovascular diseases, e.g. heart attack, bleeding tendency, severe heart disease
• oncological diseases, e.g. tumors of the head
• psychiatric disorders, e.g. schizophrenia, obsessive-compulsive disorder, anxiety disorders (such as claustrophobia), severe depression, current addictions
• head injuries, head surgery, head implants
• eye diseases (cataract, glaucoma, blindness in one eye)
• accidents that limit physical fitness and mobility
• no use of psychotropic drugs and neuroleptics and other drugs that affect the nervous system

Accepted are blood thinners, hormones, antihypertensives, cholesterol reducers