Cognitive Dimensions of Major Depressive DisorderMajor depressive disorder (MDD) is one of the most prevalent mental disorders worldwide, and is estimated to affect 300 million people. Most research defines MDD as a categorical disorder and investigations on clinical, functional, and biological correlates are assessed by established diagnostic instruments. However, given the phenotypic and biological heterogeneity of depression, a re focus on the clinical phenotype of MDD is required. Bridging