Neuropsychological Functioning in Sexual Offenders With and Without Pedophilic Disorder

This study sought to examine neuropsychological functioning in men with pedophilic disorder (PD), in order to assess whether findings from prior neuropsychological studies are replicated in a diverse sample including men with non-contact sexual offenses. It was hypothesized that when non-contact offenders are included in the study, a slowed processing speed will emerge as the only finding unique to men with PD. A comprehensive neuropsychological battery was administered to 58 men convicted of a sexual offense, 20 of whom were classified as having PD. The sample included men with contact sexual offenses (n = 33), non-contact sexual offenses (n = 5), and child sexual abuse material (CSAM) offenses (n = 20). Test performance was compared by PD status. Participants with PD performed significantly better on verbal memory and visual discrimination than those without PD. Men with PD made more errors on a set-shifting task but no significant differences were seen in domains of attention, intellectual functioning, visual learning and memory, visuospatial ability, or language ability. Effect sizes were generally small, although some medium effects were seen (visual discrimination and verbal learning and memory). Scores in both groups (with and without PD) were generally in the average range across tasks. Within the subgroup of CSAM offenders, minimal differences emerged between those with and without PD, although those with PD were slower on visuomotor set-shifting but made fewer errors (d = - 0.89). CSAM offenders with PD were in the high average range on many tasks of intellectual functioning; however, a potential trend was identified such that CSAM offenders without PD had lower scores on a task of verbal learning and memory, with medium effect sizes observed. As few differences in neuropsychological functioning emerged when comparing offenders with and without PD, differences demonstrated in prior research may be better attributed to contact offending status rather than sexual interest.