Dementia Associated Apathy.

Inclusion Criteria: * existing medical diagnosis of dementia, independent of the presence or absence of neuropsychiatric symptoms. We include nursing home residents with Informed Consent as documented by signature from the German speaking part of Switzerland with moderate to severe dementia. The presence or absence of apathy serves to assign participants into the appropriate experiments group. Exclusion Criteria: * Known or suspected non-compliance, drug or alcohol abuse, * Inability to follow the procedures of the study, e.g. due to language problems, psychological disorders * Previous enrolment into the current study, * Enrolment of the investigator, his/her family members, employees and other dependent persons, * Medically documented diagnosis of schizophrenia or bipolar disorder or the diagnosis of diminished intelligence.