Brain Pathology in Pedophilic Offenders

  • Schiltz K
  • Witzel J
  • Northoff G
 et al. 
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Abstract

Design Amygdalar volume and gray matter of related structures that are critical for sexual development were compared in 15 nonviolent male pedophilic perpetrators (forensic inpatients) and 15 controls using complementary morphometric analyses (voxel-based morphometry and volumetry). Psychosocial adjustment and sexual offenses were also assessed.
Results Pedophilic perpetrators showed a significant decrease of right amygdalar volume, compared with healthy controls (P=.001). We observed reduced gray matter in the right amygdala, hypothalamus (bilaterally), septal regions, substantia innominata, and bed nucleus of the striae terminalis. In 8 of the 15 perpetrators, enlargement of the anterior temporal horn of the right lateral ventricle that adjoins the amygdala could be recognized by routine qualitative clinical assessment. Smaller right amygdalar volumes were correlated with the propensity to commit uniform pedophilic sexual offenses exclusively (P=.006) but not with age (P=.89).
Conclusions Pedophilic perpetrators show structural impairments of brain regions critical for sexual development. These impairments are not related to age, and their extent predicts how focused the scope of sexual offenses is on uniform pedophilic activity. Subtle defects of the right amygdala and closely related structures might be implicated in the pathogenesis of pedophilia and might possibly reflect developmental disturbances or environmental insults at critical periods

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Authors

  • Kolja Schiltz

  • Joachim Witzel

  • Georg Northoff

  • Kathrin Zierhut

  • Udo Gubka

  • Hermann Fellmann

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