Research concerning cognition in depression has often yielded inconsistent findings. The presence of mixed melancholic and non-melancholic subtypes of major depressive disorder (MDD) in most previous research may explain some of the contradictory results (Hickie, 1996).
Primary Dementia Collaborative Research Centre, School of Psychiatry, University of New South Wales, 45 Beach Street (cnr Battery Street), Coogee 2034, Australia. a.withall@unsw.edu.au
