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Archives of Sexual Behavior

, Volume 44, Issue 8, pp 2161–2172 | Cite as

Diffusion Tensor Imaging of Pedophilia

  • James M. CantorEmail author
  • Sophie Lafaille
  • Debra W. Soh
  • Massieh Moayedi
  • David J. Mikulis
  • Todd A. Girard
Original Paper

Abstract

Pedophilia is a principal motivator of child molestation, incurring great emotional and financial burdens on victims and society. Even among pedophiles who never commit any offense, the condition requires lifelong suppression and control. Previous comparison using voxel-based morphometry (VBM) of MR images from a large sample of pedophiles and controls revealed group differences in white matter. The present study therefore sought to verify and characterize white matter involvement using diffusion tensor imaging (DTI), which better captures the microstructure of white matter than does VBM. Pedophilic sex offenders (n = 24) were compared with healthy, age-matched controls with no criminal record and no indication of pedophilia (n = 32). White matter microstructure was analyzed with Tract-Based Spatial Statistics, and the trajectories of implicated fiber bundles were identified by probabilistic tractography. Groups showed significant, highly focused differences in DTI parameters which related to participants’ genital responses to sexual depictions of children, but not to measures of psychopathy or to childhood histories of physical abuse, sexual abuse, or neglect. Some previously reported gray matter differences were suggested under highly liberal statistical conditions (p uncorrected < .005), but did not survive ordinary statistical correction (whole brain per voxel false discovery rate of 5 %). These results confirm that pedophilia is characterized by neuroanatomical differences in white matter microstructure, over and above any neural characteristics attributable to psychopathy and childhood adversity, which show neuroanatomic footprints of their own. Although some gray matter structures were implicated previously, only few have emerged reliably.

Keywords

DSM-5 Fractional anisotropy Hebephilia Paraphilia Pedophilia Probabilistic tractography 

Notes

Acknowledgments

This research was supported by Canadian Institutes for Health Research (CIHR) grant 89719 awarded to James Cantor. Portions of these results have been presented at the International Association for the Treatment of Sexual Offenders, Porto, Portugal, September 2014.

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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  • James M. Cantor
    • 1
    • 2
    • 3
    • 9
    Email author
  • Sophie Lafaille
    • 2
  • Debra W. Soh
    • 4
  • Massieh Moayedi
    • 5
  • David J. Mikulis
    • 6
    • 7
  • Todd A. Girard
    • 8
  1. 1.Campbell Family Mental Health Research InstituteCentre for Addiction and Mental HealthTorontoCanada
  2. 2.Complex Mental Illness ProgramCentre for Addiction and Mental HealthTorontoCanada
  3. 3.Department of PsychiatryUniversity of TorontoTorontoCanada
  4. 4.Department of PsychologyYork UniversityTorontoCanada
  5. 5.Department of Neuroscience, Physiology and PharmacologyUniversity College LondonLondonUK
  6. 6.Toronto Western Research InstituteUniversity Health NetworkTorontoCanada
  7. 7.Department of Medical ImagingUniversity of TorontoTorontoCanada
  8. 8.Department of PsychologyRyerson UniversityTorontoCanada
  9. 9.Complex Mental Illness ProgramCentre for Addiction and Mental HealthTorontoCanada

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