This trial will include healthy first-degree relatives (sub-study 1) and bipolar disorder (BD) patients in partial or full remission (defined as a score of ≤14 on the Hamilton Depression Rating Scale 17-items and the Young Mania Rating Scale (sub-study 2) with objectively-verified cognitive dysfunction. Participants will be recruited from Psychiatric Centres in The Mental Health Services in the Capital Region of Denmark, consultant psychiatrists in the Capital Region of Denmark, as well as through advertisements on relevant websites.