Inclusion criteria:  Pat. with bipolar disorder, with an age between 18 and 85 years. Euthymic/ maximum mildly depressed at the time of consent (for this, the severity of depression will be determined using the Hamilton Depression Scale, this will also be included in any calculations).  Exclusion criteria:  Pat. refuses participation Currently severely depressed/manic episode at the time of consent Other currently active severe mental/ brain organic disease (epilepsy, brain tumor..) St.p. severe craniocerebral trauma/ brain surgery. Reduced intelligence (IQ< 70) Moderate/ severe dementia (Mini Mental Status Examination, MMSE, 20 and above) Clearly substance-induced clinical picture  Inclusion criteria healthy controls:  For the whole procedure, made controls (age, gender) are needed. For this purpose we recruit controls by word of mouth or ask relatives of bipolar patients if they would like to participate. Patients are tested for the presence of a possible mental illness using Mini-DIPS (Diagnostisches Interview bei psychischen Störungen) Inclusion criteria: 18-75 years, no severe mental illness (depression, mania, psychosis; severe anxiety or obsessive-compulsive disorder requiring treatment, addictive disorder other than nicotine).  Exclusion criteria:  First-degree relatives with severe mental illness. Severe active drug dependence (i.e. alcohol, benzodiazepines morphines) Current major depressive/ manic episode Other currently active severe mental/ brain illness (epilepsy, brain tumor..) St.p. severe craniocerebral trauma/ brain surgery. Congenital/ early childhood acquired intelligence impairment Moderate/ severe dementia (from MMSE 20)