title: Motivation and melancholy: a darwinian perspective.
authors.affiliation: University of Michigan, USA.
authors.forename: R M
authors.initials: RM
authors.lastname: Nesse
mesh_terms: D005075:Biological Evolution; D003863:Depression / Q000503:physiopathology* / Q000523:psychology; D003866:Depressive Disorder / Q000503:physiopathology* / Q000523:psychology; D004644:Emotions; D006040:Goals; D006801:Humans; D009042:Motivation; D009769:Object Attachment; D012641:Selection, Genetic