Limbic system dysfunction and inventoried psychopathology among incarcerated pedophiles

Neuropsychological Executive Functions of Adolescent Sex Offenders and Nonsex Offenders

A growing body of research now suggests that a substantial number of criminal offenders display neuropsychological deficits, especially frontal-executive dysfunctions. The present study investigated the possibility of similar deficits by comparing the performance of 60 adolescent sex offenders court-ordered to a residential treatment facility with the performance of 60 nonsexual delinquent offenders matched on several pertinent sociodemographic characteristics and scores on four neuropsychological tests: (1) the Trail Making Test, (2) the Controlled Oral Word Association test of the Multilingual Aphasia Examination, (3) the Tower of London, and (4) the Wisconsin Card-sorting Test. Analysis indicated a pattern of frontal-executive dysfunction in a subset of both groups of offenders; this pattern has both theoretical and treatment implications.

A comparison of rape and molest offenders in prison psychiatric treatment

Differences in offense history, brain functioning, and psychological functioning of rape (n = 45) and molest offenders (n = 15) who were receiving psychiatric treatment while in prison were evaluated. Significant differences were found in each of these domains. Rape offenders were more likely to have histories of high violence offenses other than sexual offense, including murder, serious juvenile offenses, and both juvenile and adult sexual offenses. Rape offenders were more likely to show lower intellectual functioning and diffuse brain dysfunction associated predominantly with temporal and prefrontal brain cortices. Rape offenders were also more likely to display psychological functioning associated with illogical thinking and disordered attachment but less immature self-focus and fewer feelings of alienation than demonstrated by molest offenders. Implications for treatment and social policy for sexual offenders are suggested. Logistic regression demonstrated that these neuropsychological measures resulted in 71.7% accurate prediction and Rorschach measures resulted in 79.2% accurate prediction in differentiating rape from molest offenders. Implications for theoretical understanding of sexual offending are discussed.

Executive dysfunctions in pedophilic and nonpedophilic child molesters

INTRODUCTION

There is some evidence that child molesters show neuropsychological abnormalities which might reflect specific structural and/or functional brain alterations, but there are also inconsistencies in the existing findings which need to be clarified. Most of the different outcomes can either be explained by the fact that different types of child molesters were examined or by not having accounted for basically confounding factors such as age, education/intelligence, or criminality.

AIM

The present study therefore sought to determine whether pedophilic and nonpedophilic child molesters, compared to relevant control groups, show different profiles of executive dysfunction when accounting for potentially confounding factors.

METHODS

The performance of 30 child molesters (15 pedophilic and 15 nonpedophilic) and 33 age- and education-matched controls (16 nonsexual offenders and 17 healthy controls) was assessed regarding several neuropsychological functions.

MAIN OUTCOME MEASURES

Scores on different neurocognitive tests and semistructured diagnostical interviews.

RESULTS

Results indicate that pedophilic child molesters exhibited less performance deficits in cognitive functioning than nonpedophilic child molesters. Compared to healthy controls and nonsexual offenders, the pedophilic child molesters only showed executive dysfunction concerning response inhibition, whereas the nonpedophilic child molesters revealed more severe dysfunction, especially on tasks associated with cognitive flexibility and verbal memory.

CONCLUSIONS

These results enhance our knowledge about executive dysfunction associated with criminality and/or pedophilia, as they suggest different profiles of impairment between groups. In summary, data suggest that nonpedophilic child molesters showed more severe cognitive deficits than pedophilic child molesters. However, as response inhibition is associated with prefrontal (i.e., orbitofrontal) functioning, the deficits observed in both child molester groups indicate dysfunction in the orbitofrontal cortex. This has to be further examined with functional imaging approaches in larger samples and a full-factorial approach which allows for a clear distinction between criminality and pedophilia in a factorial manner.

Neurocognitive differences between pedophilic and nonpedophilic child molesters

Although some evidence exists that child molesters may be characterized by structural and functional brain abnormalities, findings across studies are inconsistent. Past cognitive research in this area has been extensively criticized for relying on conceptually weak batteries, measures of questionable reliability, and poorly defined samples (i.e., failing to distinguish between pedophilic and nonpedophilic child molesters). The present study aimed to address the weaknesses of past research by comparing 40 child molesters (20 pedophilic and 20 nonpedophilic) and 20 demographically matched nonoffender controls on six well-defined neurocognitive composite scores of comparable reliability (i.e., semantic knowledge, executive functioning, processing speed, motor speed, auditory memory, and visual memory). Results indicated that pedophilic child molesters exhibit slower processing speed, nonpedophilic child molesters exhibit poorer semantic knowledge, and both molester groups exhibit executive weaknesses as compared to nonoffender controls. This study is the first to compare the two molester types on neurocognitive functions. The observed differences between the molester groups help explain inconsistencies in past research and demonstrate the need to distinguish between the two types of child molesters when studying neurobiologic underpinnings of sexual offending.

Facial and prosodic affect recognition among pedophilic and nonpedophilic criminal child molesters

The present study compared facial and prosodic affect recognition abilities among pedophilic and nonpedophilic child molesters and community-dwelling controls. Pedophilic child molesters are characterized by primary sexual interest in prepubescent children, whereas nonpedophilic child molesters are characterized by offending against children despite being primarily sexually attracted to adults. The results showed that nonpedophilic child molesters made more errors in recognizing both facial and prosodic affect, performing more poorly than both controls and pedophilic child molesters. These findings are consistent with greater psychopathic tendencies among nonpedophilic molesters as well as with prior findings of smaller amygdala volume among child molesters.