SUBMISSION OF MANUSCRIPTS Manuscripts should be submitted online via our manuscript submission and tracking site, http://www.editorialmanager.com/psm/. Full instructions for electronic submission are available directly from this site. To facilitate rapid reviewing, communications for peer review will be electronic and authors will need to supply a current e-mail address when registering to use the system. Papers for publication from Europe (except those on genetic topics, irrespective of

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... ), and all papers on imaging topics, should be submitted to the UK Offi ce. Papers from the Americas, Asia, Africa, Australasia and the Middle East (except those dealing with imaging topics), and all papers dealing with genetic topics, irrespective of country, should be sent to US Offi ce. Generally papers should not have text more than 4500 words in length (excluding these sections) and should not have more than a combined total of 5 tables and/or fi gures. Papers shorter than these limits are encouraged. For papers of unusual importance the editors may waive these requirements. A structured abstract of no more than 250 words should be given at the beginning of the article using the headings: Background; Methods; Results; Conclusions. REFERENCES (1) The Harvard (author-date) system should be used in the text and a complete list of References cited given at the end of the article. In a text citation of a work by more than two authors cite the fi rst author's name followed by et al. (but the names of all of the authors should be given in the References section). Where several references are cited together they should be listed in rising date order. (2) The References section should be supplied in alphabetical order (authors' names in bold, journal titles in full), following the text. Some examples follow: Miller PM, Byrne M, Hodges A, Lawrie SM, Johnstone EC (2002). Childhood behaviour, psychotic symptoms and psychosis onset in young people at high risk of schizophrenia: early fi ndings from the Edinburgh high risk study. Psychological Medicine 32, 173-179. Cleckley HJ (1941). The Mask of Sanity, 2nd edn. Mosby: St. Louis, MO. Brewer WJ, Wood SJ, DeLuca C, Pantelis C (2006). Models of olfaction for exploring neurodevelopment. In Olfaction and the Brain (ed. W. J. Brewer, D. Castle and C. Pantelis), pp. 97-121. Cambridge University Press: Cambridge. (3) Online citations doi (when published online prior to printed issue) Lauritsen MB, Pedersen CB, Mortensen CB (2004). The incidence and prevalence of pervasive developmental disorders: a Danish population-based study. Psychological Medicine.