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Sexual Abuse: A Journal of Research and Treatment
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IQ, Handedness, and Pedophilia in Adult Male Patients Stratified by Referral Source

Ray Blanchard

Law and Mental Health Program, Centre for Addiction and Mental Health, Toronto, ON, Canada, Ray_Blanchard{at}camh.net, Department of Psychiatry, University of Toronto, Toronto, ON, Canada

Nathan J. Kolla

Law and Mental Health Program, Centre for Addiction and Mental Health, Toronto, ON, Canada, Department of Psychiatry, University of Toronto, Toronto, ON, Canada

James M. Cantor

Law and Mental Health Program, Centre for Addiction and Mental Health, Toronto, ON, Canada

Philip E. Klassen

Law and Mental Health Program, Centre for Addiction and Mental Health, Toronto, ON, Canada, Department of Psychiatry, University of Toronto, Toronto, ON, Canada

Robert Dickey

Law and Mental Health Program, Centre for Addiction and Mental Health, Toronto, ON, Canada, Department of Psychiatry, University of Toronto, Toronto, ON, Canada

Michael E. Kuban

Law and Mental Health Program, Centre for Addiction and Mental Health, Toronto, ON, Canada

Thomas Blak

Law and Mental Health Program, Centre for Addiction and Mental Health, Toronto, ON, Canada

This study investigated whether the previously observed association of pedophilia with lower IQs is an artifact of heterogeneity in referral source. The subjects were 832 adult male patients referred to a specialty clinic for evaluation of their sexual behavior. The patients' erotic preferences for prepubescent, pubescent, or adult partners were assessed with phallometric testing. Full scale IQ was estimated using six subtests from the WAIS-R. The results showed that the relations between pedophilia and lower IQ, lesser education, and increased rates of non-right-handedness were the same in homogeneous groups referred by lawyers or parole and probation officers as they were in a heterogeneous group referred by a miscellany of other sources. Those results, along with secondary analyses in the study, supported the conclusion that the relation between pedophilia and cognitive function is genuine and not artifactual. The findings were interpreted as evidence for the hypothesis that neurodevelopmental perturbations increase the risk of pedophilia in males.

Key Words: Child pornography • Education • Handedness • IQ • Laterality • Pedophilia • Phallometry • Sexual abuse • Sexual offending • Sinistrality

Sexual Abuse: A Journal of Research and Treatment, Vol. 19, No. 3, 285-309 (2007)
DOI: 10.1177/107906320701900307
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