Running Title: REDUCED HRV IN SCHIZOPHRENIA AND BIPOLAR DISORDERS Reduced heart rate variability in schizophrenia and bipolar disorder compared to healthy controls Daniel S. Quintana 1 , Lars T. Westlye 1, 2 , Tobias Kaufmann 1 , Øyvind Rustan 1 , Christine L. Brandt 1 , Beathe Haatveit 1 , Nils Eiel Steen 1, 3 , Ole A. Andreassen 1 * 1 NORMENT, KG Jebsen Centre for Psychosis Research, Division of Mental Health and Addiction, University of Oslo, and Oslo University Hospital, Oslo, Norway 2 Department of Psychology, University of Oslo, Oslo, Norway 3 Drammen Outpatient Clinic, Clinic of Mental Health and Addiction, Vestre Viken Hospital Trust, Drammen, Norway * Correspondence: Ole A. Andreassen, NORMENT, KG Jebsen Centre for Psychosis Research, Building 49, Oslo University Hospital, Ullevål, Kirkeveien 166, PO Box 4956 Nydalen, 0424 Oslo, Norway, Ph: +47 23 02 73 50 (22 11 78 43 dir), fax: +47 23 02 73 33, email: o.a.andreassen@medisin.uio.no