. Enfants and F. Toulouse, UMR 1043; F-31059 Toulouse, France. 3 Université de Toulouse; UPS; Centre de Physiopathologie de Toulouse-Purpan

S. Cassidy, Prader-Willi syndrome., Journal of Medical Genetics, vol.34, issue.11, pp.917-923, 1997.
DOI : 10.1136/jmg.34.11.917

A. Goldstone, A. Holland, B. Hauffa, A. Hokken-koelega, and M. Tauber, Recommendations for the Diagnosis and Management of Prader-Willi Syndrome, The Journal of Clinical Endocrinology & Metabolism, vol.93, issue.11, pp.4183-4197, 2008.
DOI : 10.1210/jc.2008-0649

D. Clarke, H. Boer, J. Whittington, A. Holland, J. Butler et al., Prader--Willi syndrome, compulsive and ritualistic behaviours: the first population-based survey, The British Journal of Psychiatry, vol.180, issue.4, pp.358-362, 2002.
DOI : 10.1192/bjp.180.4.358

A. Dimitropoulos and R. Schultz, Autistic-like symptomatology in Prader-Willi syndrome: A review of recent findings, Current Psychiatry Reports, vol.16, issue.Suppl1, pp.159-164, 2007.
DOI : 10.1007/s11920-007-0086-7

K. Koenig, A. Klin, and R. Schultz, Deficits in Social Attribution Ability in Prader?Willi Syndrome, Journal of Autism and Developmental Disorders, vol.96, issue.2, pp.573-582, 2004.
DOI : 10.1007/s10803-004-2551-z

D. Swaab, J. Purba, and M. Hofman, Alterations in the hypothalamic paraventricular nucleus and its oxytocin neurons (putative satiety cells) in Prader-Willi syndrome: a study of five cases, J Clin Endocrinol Metab, vol.80, pp.573-579, 1995.

Z. Donaldson and L. Young, Oxytocin, Vasopressin, and the Neurogenetics of Sociality, Science, vol.322, issue.5903, pp.900-904, 2008.
DOI : 10.1126/science.1158668

G. Domes, M. Heinrichs, A. Michel, C. Berger, and S. Herpertz, Oxytocin Improves ???Mind-Reading??? in Humans, Biological Psychiatry, vol.61, issue.6, pp.731-733, 2007.
DOI : 10.1016/j.biopsych.2006.07.015

G. Domes, A. Lischke, C. Berger, A. Grossmann, K. Hauenstein et al., Effects of intranasal oxytocin on emotional face processing in women, Psychoneuroendocrinology, vol.35, issue.1, pp.83-93, 2010.
DOI : 10.1016/j.psyneuen.2009.06.016

B. Ditzen, M. Schaer, B. Gabriel, G. Bodenmann, U. Ehlert et al., Intranasal Oxytocin Increases Positive Communication and Reduces Cortisol Levels During Couple Conflict, Biological Psychiatry, vol.65, issue.9, pp.728-731, 2009.
DOI : 10.1016/j.biopsych.2008.10.011

A. Guastella, P. Mitchell, and M. Dadds, Oxytocin Increases Gaze to the Eye Region of Human Faces, Biological Psychiatry, vol.63, issue.1, pp.3-5, 2008.
DOI : 10.1016/j.biopsych.2007.06.026

A. Guastella, S. Einfeld, K. Gray, N. Rinehart, B. Tonge et al., Intranasal Oxytocin Improves Emotion Recognition for Youth with Autism Spectrum Disorders, Biological Psychiatry, vol.67, issue.7, pp.692-696, 2010.
DOI : 10.1016/j.biopsych.2009.09.020

E. Hollander, J. Bartz, W. Chaplin, A. Phillips, J. Sumner et al., Oxytocin Increases Retention of Social Cognition in Autism, Biological Psychiatry, vol.61, issue.4, pp.498-503, 2007.
DOI : 10.1016/j.biopsych.2006.05.030

A. Marsh, H. Yu, D. Pine, and R. Blair, Oxytocin improves specific recognition of positive facial expressions, Psychopharmacology, vol.2, issue.3, pp.225-257, 2010.
DOI : 10.1007/s00213-010-1780-4

S. Baron-cohen, H. Tager-flusberg, and D. Cohen, Understanding other minds: Perpectives from developmental neuroscience, 2000.
DOI : 10.1093/acprof:oso/9780199692972.001.0001

N. Eisenberg and F. Fabes, Prosocial development Handbook of Child Psychology: Social, Emotional, and Personality Development Wiley, pp.646-718

P. Copet, J. Jauregi, V. Laurier, V. Ehlinger, C. Arnaud et al., Cognitive profile in a large french cohort of adults with Prader-Willi syndrome: differences between genotypes, Journal of Intellectual Disability Research, vol.51, issue.3, pp.204-215, 2010.
DOI : 10.1111/j.1365-2788.2010.01251.x

J. Jauregi, C. Arias, O. Vegas, F. Alen, S. Martinez et al., A neuropsychological assessment of frontal cognitive functions in Prader?Willi syndrome, Journal of Intellectual Disability Research, vol.17, issue.5, pp.350-365, 2007.
DOI : 10.1046/j.1365-2214.2003.00364.x

S. Baron-cohen, A. Leslie, and U. Frith, Does the autistic child have a ???theory of mind??? ?, Cognition, vol.21, issue.1, pp.37-46, 1985.
DOI : 10.1016/0010-0277(85)90022-8

S. Baron-cohen, S. Wheelwright, J. Hill, and Y. Raste, The "Reading the Mind in the Eyes" Test Revised Version: A Study with Normal Adults, and Adults with Asperger Syndrome or High-functioning Autism, Journal of Child Psychology and Psychiatry, vol.42, issue.2, pp.241-251, 2001.
DOI : 10.1111/1469-7610.00715

C. Mantoulan, P. Payoux, G. Diene, M. Glattard, B. Roge et al., PET Scan Perfusion Imaging in the Prader???Willi Syndrome: New Insights into the Psychiatric and Social Disturbances, Journal of Cerebral Blood Flow & Metabolism, vol.157, issue.2, pp.275-82, 2011.
DOI : 10.1093/brain/awn099