The inclusion criterion is a current or previous diagnosis of a major depressive episode according to the DSM-IV-TR (52). Primary diagnosis of participants therefore included both unipolar and bipolar depressive disorders. Exclusion criteria were previous diagnosis or high screening score of a psychotic disorder, dementia, learning disorder, eating disorder or autistic spectrum disorder or medical conditions affecting the central nervous system (CNS) (e.g., multiple sclerosis, Parkinson’s disease, brain tumor). Healthy controls were required to have no previous or current psychiatric morbidity.
