Limbic system dysfunction and inventoried psychopathology among incarcerated pedophiles

Abstract

This study explored relationships between "highly probable" neuropathology in the limbic system (as gauged by clinically elevated scores on the Limbic System Checklist-33, or LSCL-33, a screening index for limbic system dysfunction developed by medical researchers at Harvard and Dartmouth) and inventoried psychopathology (as gauged through scores on the MMPI) among a group of adjudicated pedophiles incarcerated for treatment in a specialized prison for criminal sexual psychopaths in a mid-Atlantic state. Principalfindings: Only 33 percent of this sample of incarcerated pedophiles exhibits scores on the LSCL-33 at a level high enough to warrant a medical conclusion of "probable" limbic system dysfunction. When scores on the MMPI are grouped according to critical values for clinically relevant scores on the LSCL-33, significant F ratios in one-way analyses of variance are observed on L, F, K, Hs, D, Hy, Pa, Pt, Sc, and Ma. Mean T scores for "probable" dysfunctionals simultaneously reach elevations at or above the threshold of clinical significance for Pd, Pa, and Sc.On that basis, the categorization psychopathic paranoid schizophrenia readily applies to limbic system dysfunctional child sexual abusers studied in this inquiry, but not to their nondysfunctional counterparts. But significant F ratios are observed neither for the age of the victim(s) in the instant offense(s), for the number of prior arrests for sex offenses, for the number of prior arrests for any and all felony offenses, including sex offenses, nor for the offender's current age. However, a stepwise multiple regression between gross number of prior arrests for any and all offenses (including sex offenses) as the most robust of the indices of past criminal activity and both LSCL-33 and MMPI scores across all offenders represented in this inquiry (i.e., the limbic system dysfunctional, the nondysfunctional, and a mid-range group) proceeds to four steps, achieving a multiple R of .575 and encompassing Pd, Mf, Pa, and LSCL-33 scores as the most efficient interactive post-dictive set. Stepwise multiple regression analyses of past arrest record computed independently for limbic system dysfunctionals and nondysfunctionals progresses among dysfunctionals to seven steps, achieving a multiple R of .867 and encompassing Pd, Hy, Ma, Mf, Si, Pa, and Sc scores as the most efficient interactive post-dictive set; and among nondysfunctionals, to six steps, achieving a multiple R of .797 and encompassing Mf, D, Pt, Hy, Pa, and over-controlled hostility scores as the most efficient interactive post-dictive set. The latter results are interpreted as suggesting that neuropathology and psychopathology interact with and potentiate each other in post-dicting criminal behavior among the pedophiles studied in this inquiry.This study explored relationships between "highly probable" neuropathology in the limbic system, as gauged by clinically elevated scores on the Limbic System Checklist-33 (Teicher, Glod, Surrey & Swett, 1993), a screening index for limbic system

Executive Dysfunctions in Pedophilic and Nonpedophilic Child Molesters

“…The group of nonsexual offenders consisted of mainly habitual violent offenders convicted for various forms of instrumental rather than impulsive crimes. For the child molester groups, however, this finding is consistent with those previous reports, which documented specific frontal, in particular orbitofrontal dysfunction [5,9,15,42–44] in child sexual abusers. Analogue results were found in addicted, compulsive, and impulsive behaviors [45], which could be summarized as obsessive‐compulsive spectrum disorders [46,47], even though, for different reasons, all these syndromes are characterized by concurrent behavioral disinhibition [18,48].…”

Facial and Prosodic Affect Recognition Among Pedophilic and Nonpedophilic Criminal Child Molesters

“…In addition to the obvious motivational differences between pedophilic and nonpedophilic child molesters (Barsetti, Earls, Lalumiere, & Belanger, 1998;Strand, 1995), pedophiles tend to have more victims (sometimes hundreds; e.g., Abel & Osborn, 1992) and higher rates of recidivism than nonpedophilic child molesters. It has been hypothesized that pedophilic child molesters repeatedly offend against children in part because of poor impulse control mediated by weaknesses in frontal-lobe functions (Flor-Henry et al, 1991;Stone & Thompson, 2001) and more importantly, because of strong sexual attraction toward children presumably mediated by temporal-limbic abnormalities (Bogaert, 2001;Cohen & Galynker, 2002;Pallone & Voelbel, 1998;Wright et al, 1990). However, the latter of these mechanisms does not appear applicable to nonpedophilic child molesters.…”

Neurocognitive differences between pedophilic and nonpedophilic child molesters

“…Given the findings of potentially both frontal and temporal lobe abnormalities among child molesters, it has been hypothesized that these men repeatedly offend against children in part because of poor impulse control mediated by weaknesses in frontal lobe functions and in part because of strong sexual attraction toward children presumably mediated by temporal-limbic abnormalities (Bogaert, 2001; Cohen et al, 2002; Pallone & Voelbel, 1998; Wright et al, 1990). Alternatively, it has been argued that because the temporal lobe abnormalities among child molesters are thought to affect primarily the left-hemisphere functions, as is reflected in poorer language skills (Cohen et al, 2002; Joyal et al, 2007; Langevin et al, 1989), it is possible that child molesters’ attraction to children is partly mediated by their in ability to relate normally to adults (Marshall et al, 2000).…”