Psychological Medicine

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Extended psychosis phenotype – yes: single continuum – unlikely

A commentary on ‘Why we need more debate on whether psychotic symptoms lie on a continuum with normality’ by David (2010)

N. Kaymaza1a2 and J. van Osa1a3 c1

a1 Maastricht University Medical Centre, South Limburg Mental Health Research and Teaching Network, EURON, Maastricht, The Netherlands

a2 Mediant GGZ/Mental Health Care, Postbus 775, 7500 AT Enschede, The Netherlands

a3 Division of Psychological Medicine, Institute of Psychiatry, King's College London, De Crespigny Park, Denmark Hill, London, UK

(Received February 07 2010)

(Accepted February 08 2010)

(Online publication March 18 2010)


c1 Address for correspondence: J. van Os, Ph.D., Department of Psychiatry and Psychology, Maastricht University Medical Centre, PO Box 616 (location DOT12), 6200 MD Maastricht, The Netherlands. (Email: