Psychopathy Checklist-Revised Scores Research Articles

Performance intelligence, sexual offending and psychopathy

Previous studies have suggested that offenders have lowered verbal intelligence compared to their performance intelligence. This phenomenon has been linked traditionally to childhood risk factors (e.g. deficient education, abuse and neglect). Substantial discrepancies between performance intelligence quotients (PIQ) and verbal intelligence quotients (VIQ), however, might also point to neurobiological impairments which may be associated with specific types of criminal behaviour. From the files of 133 male hospitalized offenders, PIQ, VIQ, full scale IQ (FSIQ) scores and Psychopathy Checklist–Revised (PCL-R) scores were derived, along with information about their criminal histories. PIQ over VIQ discrepancies were most pronounced in sexual offenders, particularly in those who had committed sexual crimes against adult victims. Furthermore, PIQ as well as PIQ higher than VIQ discrepancies correlated modestly, but significantly, with PCL-R scores. The results suggest that lower verbal compared to visual and spatial abilities may be connected specifically to egocentric and narcissistic personality traits which, in turn, may be involved in raising the risk of sexual offending.

Structural, Item, and Test Generalizability of the Psychopathy Checklist—Revised to Offenders With Intellectual Disabilities

The Psychopathy Checklist-Revised (PCL-R) is the most widely used measure of psychopathy in forensic clinical practice, but the generalizability of the measure to offenders with intellectual disabilities (ID) has not been clearly established. This study examined the structural equivalence and scalar equivalence of the PCL-R in a sample of 185 male offenders with ID in forensic mental health settings, as compared with a sample of 1,212 male prisoners without ID. Three models of the PCL-R's factor structure were evaluated with confirmatory factor analysis. The 3-factor hierarchical model of psychopathy was found to be a good fit to the ID PCL-R data, whereas neither the 4-factor model nor the traditional 2-factor model fitted. There were no cross-group differences in the factor structure, providing evidence of structural equivalence. However, item response theory analyses indicated metric differences in the ratings of psychopathy symptoms between the ID group and the comparison prisoner group. This finding has potential implications for the interpretation of PCL-R scores obtained with people with ID in forensic psychiatric settings.

The development of a specialist hostel for the community management of personality disordered offenders

Since the late 1990s, in England and in Wales, there has been increasing interest in the particular challenges of managing offenders with personality disorder (PD). In 1999, a specialist hostel, managed by the probation service but with a high level of forensic mental health service input, was opened to high-risk PD offenders. To describe the first 93 high-risk residents with PD who were completing sentences under life licence, parole or probation, and their outcome. We investigated the nature of the offences residents had previously committed, their psychological profile in terms of personality patterns on the Millon Clinical Multiaxial Inventory (MCMI-III) and the Psychopathy Checklist-Revised (PCL-R), as well as staff commentary on their progress, to establish whether these factors related to outcome in terms of completion of stay in the hostel or premature discharge. Curfew failures and rearrest rates were also measured. Of the 80 men who completed their residency within the two years of the study, the majority (50) left the hostel for positive reasons under mutual agreement. One-fifth were rearrested while resident, which is a lower rate than would be expected for such a group of offenders. PCL-R scores were predictive of outcome, but so was previous offending history. Self-defeating traits on the MCMI-III and negative comments written by hostel staff were also associated with failure. The hostel development demonstrated that probation and health services can work together to manage violent offenders with high levels of psychological dysfunction, and the evaluation provided some indications of how such arrangements might be enhanced.

Intoxication and violent women

Alcohol and drugs have been linked to severe violent offending among women as well as men. The purpose of this study was to make a contribution to the limited knowledge of characteristics related to the state of intoxication in violent female offenders. The putative differences in the characteristics of female offenders and their violent offenses in relation to the state of intoxication at the time of the violent offending were examined. Of a nation-wide sample of 109 female offenders found guilty of homicide and other violent crimes and incarcerated in 1999-2000 in Finland, 60 offenders participated in the study. Of these offenders 49 (81.7%) had been intoxicated at the time the of index offenses. These were compared with 11 (18.3%) non-intoxicated offenders using a structured interview, the Structured Clinical Interview II for DSM-IV (SCID-II) and the Hare Psychopathy Checklist-Revised (PCL-R). The prevalence of substance abuse or dependence (73.3% and 0%), personality disorder (89.6% and 36.4%), particularly antisocial personality disorder (66.7% and 0%), as well as a history of criminality (69.4% and 0%) were significantly higher among the intoxicated women than among the non-intoxicated. The PCL-R scores were also significantly higher among the intoxicated offenders than among non-intoxicated offenders. The victims of the intoxicated women (23.9%) were less often emotionally close to the perpetrator than were the victims of the non-intoxicated women (66.6%). No differences emerged between the groups in experiences of childhood and adulthood abuse or stressful life events prior to the index crime. The findings indicate that intoxicated violent female offenders exhibit more of the characteristics previously found in violent men, than do the non-intoxicated female offenders. Moreover, the non-intoxicated group comprises both psychotic non-responsible and non-psychotic, fairly well-adjusted women, who are educated, working or studying at the time of the offense and has no history of criminality. Substance misuse constitutes an obvious risk factor for violent behavior in women, and therefore the prevention should include substance abuse treatment.

Comparison of Personality Traits in Pedophiles, Abstinent Opiate Addicts, and Healthy Controls

To investigate the model of pedophilia as a disorder of addictive behavior, pedophiles and chemically addicted individuals were compared on personality traits potentially associated with impaired behavioral inhibition. Twenty-nine pedophiles, 25 opiate addicts (OA's), and 27 healthy controls were administered the Barratt Impulsivity Scale, Hare Psychopathy Checklist-Revised (PCL-R), and Structured Clinical Interview for DSM-V for Axis-II. OA's scored higher than either pedophiles or controls on the Barratt. Pedophiles and OA's scored higher than controls on all 3 Psychopathy Checklist-Revised scores but OA's scored marginally higher than pedophiles on factor 2 (behavioral) and total scores. On Structured Clinical Interview for DSM-V for Axis-II, pedophiles scored higher than controls on paranoid and schizoid scores whereas OA's did so on paranoid scores. Thus, both pedophiles and OA's may have elevated psychopathic traits and propensity toward cognitive distortions, as reflected in cluster A traits. Such similarities support the conceptualization of pedophilia as a behavioral addiction. Pedophiles may be less impulsive than OA's, however, and more prone toward cognitive distortions.

Does interrater (dis)agreement on Psychopathy Checklist scores in sexually violent predator trials suggest partisan allegiance in forensic evaluations?

Many studies reveal strong interrater agreement for Hare's Psychopathy Checklist-Revised (PCL-R) when used by trained raters in research contexts. However, no systematic research has examined agreement between PCL-R scores from independent clinicians who are retained by opposing sides in adversarial legal proceedings. We reviewed all 43 sexual-offender civil-commitment trials in one state and identified 23 cases in which opposing evaluators reported PCL-R total scores for the same individual. Differences between scores from opposing evaluators were usually in a direction that supported the party who retained their services. These score differences were greater in size than would be expected based on the instrument's standard error of measurement or the rater agreement values reported in previous PCL-R research. The intraclass correlation for absolute agreement for the PCL-R Total score from a single rater (ICC 1,A = .39) was well below levels of agreement observed for the PCL-R in research contexts, and below published test-retest values for the PCL-R. Results raise concerns about the potential for a forensic evaluator's "partisan allegiance" to influence PCL-R scores in adversarial proceedings.

DRD2 and ANKK1 genotype in alcohol-dependent patients with psychopathic traits: Association and interaction study

The TaqI-A polymorphism of the ANKK1 gene, adjacent to the DRD2 gene, has been associated with alcoholism and other psychiatric conditions, although other DRD2 gene variants, such as the C957T polymorphism, could be related to these phenotypic traits. To investigate the contribution of the TaqI-A and the C957T polymorphisms to the presence of psychopathic traits in patients with alcoholism. We performed association and interaction analyses of the polymorphisms in 150 controls and 176 male alcohol-dependent patients assessed for the presence of dissocial personal disorder, using the Psychopathy Checklist-Revised (PCL-R). There was a significant association of the TaqI-A and C957T polymorphisms when both genotypes were present, with PCL-R scores of F(1-171=0.13) (P=0.01) and a frequency of dissocial personal disorder OR=10.52, P<0.001. The TaqI-A of the ANKK1 gene and the C957T of the DRD2 gene are epistatically associated with psychopathic traits in alcohol-dependent patients.

Age at onset of substance abuse: A crucial covariate of psychopathic traits and aggression in adult offenders

To examine age at onset of substance abuse in relation to other factors of relevance to criminal behavior, we compared Life History of Aggression (LHA) scores, traits of psychopathy according to the Psychopathy Checklist — Revised (PCL-R), and violent recidivism in 100 violent offenders with early (before the age of 18) versus late onset of abuse or dependence. Of 56 subjects with a history of alcohol and/or drug abuse, an early onset was ascertained in 31. The duration of abuse did not correlate with the LHA and PCL-R scores or with violent recidivism, but the age at onset correlated strongly with all these factors and also remained their strongest correlate in multivariate models including childhood-onset attention deficit/hyperactivity disorder, conduct disorder, and drug abuse as covariates. Strong mathematical associations with aggression, psychopathy, and recidivism pointed to age at onset of substance abuse as a marker of possible complications that require preventive social, educational and medical measures.

Score Metric Equivalence of the Psychopathy Checklist–Revised (PCL-R) Across Criminal Offenders in North America and the United Kingdom

David Cooke and colleagues have published a series of item response theory (IRT) studies investigating the equivalence of the Psychopathy Checklist-Revised (PCL-R) for European versus North American (NA) male criminal offenders. They have consistently concluded that PCL-R scores are not equivalent, with European offenders receiving scores up to five points lower than those in NA when matched according to the latent trait. In this article, the authors critique the Cooke et al. analyses and demonstrate how their anchor item selection method is responsible for their final conclusions concerning the apparent lack of equivalence. The authors provide a competing IRT analysis using an iterative purification strategy for anchor item selection and show how this more justifiable approach leads to very different conclusions regarding the equivalence of the PCL-R. More generally, it is argued that strong interpretations of IRT analyses in the presence of uncorroborated anchor items can be highly misleading when evaluating score metric equivalence.

Association of psychopathic traits and symptomatology with violence in patients with schizophrenia

The main aim of the current study is to investigate the association of psychopathic traits and symptomatology with violence in male patients with schizophrenia. The Psychopathy Checklist-Revised (PCL-R) and the Brief Psychiatric Rating Scale (BPRS) were administered to 35 hospitalized male patients diagnosed with schizophrenia. Based on their history of violence, the sample was divided into violent ( N = 19) and nonviolent ( N = 16) groups. Data were analyzed using parametric, nonparametric and regression analyses. The mean psychopathy and hostility (component of the BPRS) scores were significantly higher for the violent group. Only three patients (16%), all from the violent group, met the diagnostic cutoff for psychopathy (a PCL-R score ≥ 30). Regression analyses suggest that both the hostility component of the BPRS and the behavioral component of the PCL-R (Factor 2) are significant predictors of violent behavior in male patients with schizophrenia. However, when the psychopathy scores are high, the probability for violence is already considerable and the level of hostility has only a slight effect. These findings suggest that improvement in illness condition may not reduce the likelihood for violence in male patients with a high psychopathic profile.

An empirical investigation of psychopathy in a noninstitutionalized and noncriminal sample

This study examined the construct of psychopathy using the Psychopathy Checklist-Revised (PCL-R) in 54 participants from the general population. To obtain a sample of community participants with psychopathic characteristics, participants were recruited using advertisements for a "personality study" that incorporated the characteristics of psychopathy in a nonpejorative manner. The methodology successfully recruited community participants with moderately elevated PCL-R scores. Participants exhibited the personality features of psychopathy (Factor 1) to a greater extent than the behavioral features (Factor 2), which is consistent with the results obtained with the PCL-R normative samples. Roughly 40% of the sample reported no history of involvement with the criminal justice system, yet these participants exhibited moderately elevated PCL-R scores. Moreover, a sizeable portion of the noncriminal participants reported a substantial history of violent behavior. Comparisons of PCL-R scores between participants with and without a criminal history suggest that these two groups differ in ways unrelated to criminal justice system involvement.

Patterns of attachment and alcohol abuse in sexual and violent non-sexual offenders

Two studies related to substance abuse and sexual offending were conducted. In the first study, a sample of 94 sexual offenders and 21 violent non-sexual offenders, incarcerated within the Ontario Region of Correctional Service of Canada (CSC), were administered the Michigan Alcohol Screening Test (MAST), the Drug Abuse Screening Test (DAST) and the Relationship Styles Questionnaire (RSQ). The Hare Psychopathy Checklist–Revised (PCL-R) was also scored for the majority of offenders included in the present study. Results indicated that the groups differed on PCL-R score, with both rapists and violent non-sexual offenders scoring significantly higher than the child molesters with reference to total PCL-R score. Sex offenders’ mean score on the MAST were significantly higher than those of the violent non-sexual offenders. The mean score on the MAST for sex offenders was in the problem drinking range. With reference to attachment pattern, sex offenders were found to be more preoccupied than violent non-sexual comparison subjects. In the second study, a sample of sexual offenders, all of whom exhibited elevated levels of alcohol abuse as measured by the MAST, were divided into two groups based on whether or not they had completed a substance abuse treatment programme. Sexual offenders (all of whom received sex offender-specific treatment) who also received substance abuse treatment evidenced significantly lower levels of general recidivism than those who did not complete such treatment. Results are discussed in light of previous findings in relation to differing patterns of substance abuse between sexual and violent non-sexual offenders observed in the literature as well as with reference to Marshall's attachment theory.

The Evidentiary Introduction of Psychopathy Checklist-Revised Assessed Psychopathy in U.S. Courts: Extent and Appropriateness.

We examine the application of Psychopathy Checklist Revised (PCL-R) assessed psychopathy in U.S. courts from the time of the introduction of the PCL-R in 1991, through the end of 2004, and consider the PCL-R in light of relevant evidentiary standards and the empirical support for the construct of psychopathy. Our review of the Westlaw legal database indicates that the evidentiary introduction of PCL-R assessed psychopathy extends across state and federal jurisdictions, and has increased considerably in recent years. We identify nine contexts in which PCL-R evidence has been introduced and examine the appropriateness of such introduction. In most contexts the PCL-R was considered with regard to the prediction of violence in the community, and in such context the introduction of PCL-R scores appears appropriate, at least with regard to European American male offenders. However, PCL-R assessments may not meet relevant evidentiary standards with regard to the prediction of institutional violence and violence among females, adolescents and ethnic minorities.

Sex Offenders’ Response to Treatment and its Association with Recidivism as a Function of Psychopathy

This study examined the relationship between recidivism and ratings of response to specialized cognitive behavioral treatment conducted in a prison setting among 418 sex offenders released to the community for an average follow-up period of over 5 years. As well as testing for a main effect for treatment ratings, the potential role of psychopathy assessed using the Psychopathy Checklist-Revised (PCL-R) as a moderator of response to treatment was investigated. Ratings of response to treatment failed to predict either serious (violent including sexual) or sexual recidivism. For the more inclusive outcome of serious recidivism, there was no significant interaction between psychopathy and treatment ratings; however, the ubiquitous effect of psychopathy on recidivism was found to be significant. For sexual recidivism, psychopathy was not significant as a main effect, but a significant interaction between psychopathy and treatment ratings was found. Among sex offenders with PCL-R scores of 25 or higher, those with ratings reflecting a more negative response to treatment recidivated sexually at a faster rate than others. This interaction effect was not significant when treatment noncompleters were removed from the data set. The results were discussed in terms of the methodology involved in the assessment of response to treatment among sex offenders.

Sex Offenders' Response to Treatment and its Association with Recidivism as a Function of Psychopathy

This study examined the relationship between recidivism and ratings of response to specialized cognitive behavioral treatment conducted in a prison setting among 418 sex offenders released to the community for an average follow-up period of over 5 years. As well as testing for a main effect for treatment ratings, the potential role of psychopathy assessed using the Psychopathy Checklist--Revised (PCL-R) as a moderator of response to treatment was investigated. Ratings of response to treatment failed to predict either serious (violent including sexual) or sexual recidivism. For the more inclusive outcome of serious recidivism, there was no significant interaction between psychopathy and treatment ratings; however, the ubiquitous effect of psychopathy on recidivism was found to be significant. For sexual recidivism, psychopathy was not significant as a main effect, but a significant interaction between psychopathy and treatment ratings was found. Among sex offenders with PCL-R scores of 25 or higher, those with ratings reflecting a more negative response to treatment recidivated sexually at a faster rate than others. This interaction effect was not significant when treatment noncompleters were removed from the data set. The results were discussed in terms of the methodology involved in the assessment of response to treatment among sex offenders.

Psychopathy, Risk of Violence, and Protective Factors in a Noninstitutionalized and Noncriminal Sample

The relationship between psychopathy and violence among incarcerated and institutionalized samples has received considerable attention, but less is known about the risk of violence posed by psychopaths in the community, particularly those with no prior contact with the criminal justice system. Moreover, little is known about why some psychopaths have avoided being arrested. This study considered the role of specific protective factors in relation to Psychopathy Checklist-Revised (PCL-R) scores and three measures of antisocial behavior among 54 community participants with and without criminal histories. The methodology effectively recruited individuals with moderately elevated PCL-R scores. Roughly 40% of the sample reported no history of arrests, and a sizeable portion of both criminal and noncriminal participants reported a history of violent behavior. Results revealed no significant relationship between protective factors and participants' PCL-R scores and involvement in antisocial behavior. Secondary analyses found a significant negative correlation between protective factors and PCL-R scores for participants with higher levels of psychopathic characteristics. Finally, noncriminal participants endorsed considerably more protective factors than criminal participants. Findings suggest that protective factors may hold promise for explaining why some high-risk individuals can avoid contact with the criminal justice system.

Psychopathy, Treatment Change, and Recidivism in High-Risk, High-Need Sexual Offenders

The present study investigated 154 consecutive admissions to the Regional Treatment Center (Ontario) Sex Offender Treatment Program with reference to psychopathy and outcome. Ratings of treatment behavior, as well as clinical judgments as to whether risk was reduced, were coded based on treatment reports. With reference to Psychopathy Checklist-revised (PCL-R) scores, survival analyses indicated that high scorers recidivated at significantly higher rates than low scorers. However, offenders who received high PCL-R scores and lower scores on measures of treatment behavior recidivated at the same rate as low scorers on the PCL-R. Furthermore, among high PCL-R offenders, those rated as lower risk at post treatment in fact reoffended at a lower rate than those whose risk was rated as unchanged, although this difference failed to reach significance. Findings are discussed in light of the clinical and research literature.

Recidivism is related to psychopathy (PCL-R) in a group of men convicted of homicide

It is well known that psychopaths are a group with high risk for criminality. Despite that, researchers and clinicians have not yet agreed on a general cause of psychopathy. However Raine [Raine, A. (2002). Biosocial studies of antisocial and violent behavior in children and adults: A review. Journal of Abnormal Child Psychology, 30, 311-326.] advocated a biosocial model of violent behaviour where the greatest risk for criminal behaviour occurred when both heredity and environmental risk factors (e.g., social class, childhood history) were present. In this follow-up study, 35 men convicted of homicide were assessed retrospectively for psychopathy according to the Psychopathy Checklist-Revised (PCL-R). Information on personal history, as well as from legal documents and records of offences committed by the subjects was also obtained. Fourteen of the 35 men were classified as psychopaths. Two men, both rated as psychopaths, had criminal parents. Twenty-seven of the men had a social relationship with their victim, and eleven out of these were rated as psychopaths. There was no difference in PCL-R scores between those who had a social relationship with their victim and those who did not. The psychopaths relapsed more frequently than the nonpsychopaths into criminality after their prison term. This result confirms previous research indicating that psychopathy is a risk factor for recidivism. It is, therefore, very important that psychopaths get the best possible treatment, aftercare, and supervision.

The childhood-onset neuropsychiatric background to adulthood psychopathic traits and personality disorders

Childhood conduct disorder (CD) and adult psychopathic traits according to the Psychopathy Checklist Revised (PCL-R) were the closest psychiatric covariates to repeated violent crimes and aggression among offenders under forensic psychiatric investigation in Sweden. As psychopathy is not included in the present psychiatric diagnostic systems, we compared total and factor PCL-R scores to Axis I disorders, including childhood-onset neuropsychiatric disorders, and to Axis II personality disorders, to establish the convergence of psychopathic traits with other psychiatric diagnoses, and to identify possible unique features. Psychopathic traits were positively correlated with bipolar mood disorder and negatively with unipolar depression. The total PCL-R scores as well as the Factor 2 (unemotionality) and Factor 3 (behavioral dyscontrol) scores were significantly correlated with attention-deficit/hyperactivity disorder, Asperger's syndrome/high-functioning autistic traits, CD, substance abuse, and the Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition Cluster B personality disorders. The interpersonal Factor 1 showed none of these correlations and may capture features that are specific to psychopathy, distinguishing core psychopathy from other diagnostic definitions.

PCL-R psychopathy predicts disruptive behavior among male offenders in a Dutch forensic psychiatric hospital.

In this study, the relationship between psychopathy, according to the Dutch language version of Hare's Psychopathy Checklist-Revised (PCL-R), and various types of disruptive behavior during inpatient forensic psychiatric treatment is investigated. Ninety-two male participants were administered the PCL-R following admission to an inpatient forensic hospital. From daily hospital information bulletins, incidents of verbal abuse, verbal threat, physical violence, and violation of hospital rules were derived. Also, the number of seclusion episodes was recorded. As expected, significant correlations were found between PCL-R scores and verbal abuse, verbal threat, violation of rules, total number of incidents, and frequency of seclusion. Psychopaths (PCL-R > or = 30) were significantly more often involved in incidents than nonpsychopaths. Multiple regression analyses revealed that the PCL-R Factor 2 score in particular contributed uniquely to the prediction of the total number of incidents. The findings are discussed in terms of their clinical implications.