Assessment of psychopathy as a function of age.

The assessment of psychopathy was examined as a function of age in 889 male prison inmates between the ages of 16 and 69. Ratings of psychopathy were made with the Psychopathy Checklist (PCL), which measures 2 correlated factors. Factor 1 describes a cluster of affective-interpersonal traits central to psychopathy. Factor 2 describes traits and behaviors associated with an unstable, unsocialized lifestyle, or social deviance. Cross-sectional analyses revealed that mean scores on Factor 1 were stable across the age-span; mean scores on Factor 2 declined with age. The prevalence of antisocial personality disorder, and, to a lesser extent of PCL-defined psychopathy, also declined with age. The results are consistent with a conceptualization of psychopathy as encompassing 2 correlated but distinct constructs. They also suggest that age-related differences in traits related to impulsivity, social deviance, and antisocial behavior are not necessarily paralleled by differences in the egocentric, manipulative, and callous traits fundamental to psychopathy. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

The reliability and validity of the Psychopathy Checklist: Youth Version (PCL:YV) in nonincarcerated adolescent males.

Current knowledge about the validity of the psychopathy syndrome in youth is limited largely to studies relying on parent-teacher rating scales or slight modifications of adult measures. Recently, the Psychopathy Checklist: Youth Version (PCL:YV) was designed for use with adolescents. However, most studies that have used this measure examined incarcerated mates and addressed only validity criteria related to antisocial behavior. We investigated the generality and construct validity of the psychopathy syndrome in an adolescent sample by assessing 115 adolescent males on probation with the PCL:YV. Reliability of measurement was high. PCL:YV ratings predicted not only antisocial behavior but also other indices of childhood psychopathology, interpersonal behaviors associated with adult psychopathy, and a lack of attachment to parents. These findings suggest that the PCL:YV identifies a syndrome in adolescence consistent with theory and research on adult males. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Discriminant validity of the Psychopathy Checklist in a forensic psychiatric population.

The association between psychopathy and other mental disorders was investigated in 80 male forensic patients. Psychopathy was assessed with the Psychopathy Checklist (PCL; R. D. Hare [see PA, Vol 67:2477]). Diagnoses of other mental disorders were based on Axis I and Axis II criteria listed in the third edition of the Diagnostic and Statistical Manual of Mental Disorders (DSM-III) and on two standardized psychiatric rating scales. PCL diagnoses were significantly related only to antisocial and histrionic personality disorder (PD) and to nonalcohol substance abuse disorders. PCL ratings were also positively correlated with prototypicality ratings of antisocial, histrionic, and narcissistic PD and negatively correlated with ratings of avoidant PD. The results provide evidence for the convergent and discriminant validity of the PCL and are consistent with the view that psychopathy is a distinct clinical syndrome. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Assessing the basic traits associated with psychopathy: Development and validation of the Elemental Psychopathy Assessment.

A new self-report assessment of the basic traits of psychopathy was developed with a general trait model of personality (five-factor model [FFM]) as a framework. Scales were written to assess maladaptive variants of the 18 FFM traits that are robustly related to psychopathy across a variety of perspectives including empirical correlations, expert ratings, and translations of extant assessments. Across 3 independent undergraduate samples (N = 210–354), the Elemental Psychopathy Assessment (EPA) scales proved to be internally consistent and unidimensional, and were strongly related to the original FFM scales from which they were derived (mean convergent r = .66). The EPA scales also demonstrated substantial incremental validity in the prediction of existing psychopathy measures over their FFM counterparts. When summed to form a psychopathy total score, the EPA was substantially correlated with 3 commonly used psychopathy measures (mean r = .81). Finally, in a small male forensic sample (N = 70), the EPA was significantly correlated with scores on a widely used self-report psychopathy measure, disciplinary infractions, alcohol use, and antisocial behavior. The EPA provides an opportunity to examine psychopathy and its nomological network through smaller, more basic units of personality rather than by scales or factors that blend these elements. (PsycINFO Database Record (c) 2011 APA, all rights reserved)     

Psychopathy and community violence among civil psychiatric patients: Results from the MacArthur Violence Risk Assessment Study.

Although psychopathy is recognized as a relatively strong risk factor for violence among inmates and mentally disordered offenders, few studies have examined the extent to which its predictive power generalizes to civil psychiatric samples. Using data on 1,136 patients from the MacArthur Violence Risk Assessment project, this study examined whether the 2 scales that underlie the Psychopathy Checklist: Screening Version (PCL:SV) measure a unique personality construct that predicts violence among civil patients. The results indicate that the PCL:SV is a relatively strong predictor of violence. The PCL:SV's predictive power is substantially reduced, but remains significant, after controlling for a host of covariates that reflect antisocial behavior and personality disorders other than psychopathy. However, the predictive power of the PCL:SV is not based on its assessment of the core traits of psychopathy, as traditionally construed. Implications for the 2-factor model that underlies the PCL measures and for risk assessment practice are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Applicability of traditional and revised models of psychopathy to the Psychopathy Checklist: Screening Version.

Recently, psychopathy has become virtually synonymous with the Psychopathy Checklist (PCL) measures. However, the "gold standard" 2-factor model that underlies these measures has been questioned for its uncertain empirical support and emphasis on antisocial behavior that is not specific to psychopathic personality deviation. This study (N=870 civil psychiatric patients) compares the fit of the traditional 2-factor model with that of a revised 3-factor model of psychopathy. The revised model better describes the structure of the Screening Version of the PCL (PCL:SV) than the traditional model. Although the revised model's exclusion of some items that assess antisocial behavior reduces the PCL:SV's power in predicting patient violence, this model arguably assesses psychopathy in a more specific, theoretically coherent fashion that may reduce misapplications of the construct. Implications for future research are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

A new method for assessing the interpersonal behavior of psychopathic individuals: Preliminary validation studies.

Two studies examined whether increased attention to interpersonal behaviors would improve assessments of the personality core underlying psychopathy. After item analysis, 21 items measuring interpersonal interactions and nonverbal behaviors associated with psychopathy were retained as the Interpersonal Measure of Psychopathy (IM-P). Federal prison inmates (Study 1, N?=?98) and undergraduates (Study 2, N?=?92) were rated on occurrence of these behaviors during an interview conducted to complete either Hare's Psychopathy Checklist—Revised (PCL-R) or Psychopathy Checklist: Screening Version (PCL: SV). In both studies, IM-P scores correlated more highly with PCL Factor 1 than with PCL Factor 2 scores. Regression analyses indicated that, after controlling for demographic variables and PCL factor scores, IM-P scores predicted interviewer emotional responses and participants' adult fighting (Study 1) and ratings of participants' interpersonal dominance (Study 2). Thus, measurement of interpersonal behavior appears to permit improved prediction of several criteria linked to the personality core of psychopathy. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Psychopathy and violence: The importance of factor level interactions.

The power of scales based on the Psychopathy Checklist (PCL; R. D. Hare, 1980) for prediction of violent behavior is well established. Although evidence suggests that this relationship is chiefly due to the impulsive and antisocial lifestyle component (Factor 2), the predictive power of psychopathy for violence may also reflect the multiplicative effects of this component with interpersonal and unemotional traits (Factor 1). The determination of the extent to which psychopathy subcomponents interact to predict violence has theoretical and practical implications for PCL-assessed psychopathy. However, the relationship between violence and the interactive effects of psychopathy subcomponents remains largely undetermined. The authors used prospective and cross-sectional designs to examine the independent and interactive effects of the factors of PCL-assessed psychopathy in 2 samples: (a) 199 county jail inmates and (b) 863 civil psychiatric patients. The Factor 1 × Factor 2 interaction predicted violence in both samples, such that the predictive power of Factor 2 was attenuated at lower levels of Factor 1. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

The MMPI—2 Antisocial Practices Content Scale: Construct validity and comparison with the Psychopathic Deviate Scale.

Little is known regarding the construct validity of the Minnesota Multiphasic Personality Inventory—2 Antisocial Practices (ASP) content scale or its differences from the Psychopathic Deviate (Pd) scale. In 3 studies with undergraduates (Ns?=?95, 110, and 100), the ASP scale exhibited convergent and discriminant validity with self-report, interview, family history, and observer measures of psychopathy, personality disorders, and personality traits. The ASP and Pd scales had many similar correlates, but the ASP scale correlated more positively with measures of Machiavellianism and more negatively with interviewer-rated honesty than the Pd scale. The ASP scale demonstrated incremental validity over and above the Pd scale for global indexes of psychopathy and antisocial behavior. Neither scale related highly to the absence of stress and interpersonal anxiety characteristic of psychopathy. The ASP and Pd scales, although overlapping in content, appear to measure somewhat different facets of the psychopathy construct. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Is criminal behavior a central component of psychopathy? Conceptual directions for resolving the debate.

The development of the Psychopathy Checklist—Revised (PCL–R; R. D. Hare, 2003) has fueled intense clinical interest in the construct of psychopathy. Unfortunately, a side effect of this interest has been conceptual confusion and, in particular, the conflating of measures with constructs. Indeed, the field is in danger of equating the PCL–R with the theoretical construct of psychopathy. A key point in the debate is whether criminal behavior is a central component, or mere downstream correlate, of psychopathy. In this article, the authors present conceptual directions for resolving this debate. First, factor analysis of PCL–R items in a theoretical vacuum cannot reveal the essence of psychopathy. Second, a myth about the PCL–R and its relation to violence must be examined to avoid the view that psychopathy is merely a violent variant of antisocial personality disorder. Third, a formal, iterative process between theory development and empirical validation must be adopted. Fundamentally, constructs and measures must be recognized as separate entities, and neither reified. Applying such principles to the current state of the field, the authors believe the evidence favors viewing criminal behavior as a correlate, not a component, of psychopathy. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Criterion-related validity of the Psychopathic Personality Inventory in a prison sample.

The Psychopathic Personality Inventory (PPI; S. 0. Lilienfeld & B. P. Andrews, 1996), a self-report measure of psychopathic personality features, and R. D. Hare's (1991) Psychopathy Checklist–Revised (PCL–R) were administered to adult youthful offender prison inmates (N?=?50). As hypothesized, PPI scores were significantly correlated with scores on the PCL–R, providing evidence of concurrent validity for the PPI. Moreover, unlike existing self-report psychopathy measures, the PPI showed a moderate and positive correlation with PCL–R Factor 1 (i.e., the core personality traits of psychopathy). Discriminant function analysis using the optimal PPI total score value to predict PCL–R classifications of psychopath (n?=?10) and nonpsychopath (n?=?40) resulted in accurate classification of 86% of the cases (sensitivity?=?.50, specificity?=?.95). Results are discussed in terms of the relative merits of these 2 measures of psychopathy and the validation of the PPI for clinical use. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Antisocial personality disorder, conduct disorder, and substance abuse in schizophrenia.

The validity of subtypes based on antisocial personality disorder (APD) or childhood conduct disorder without adult APD (CD only) in patients with schizophrenia (or schizoaffective disorder) and a substance use disorder (abuse or dependence) was examined. APD patients scored lower on personality measures related to socialization and higher on antisocial bebavior, psychopathy, and aggression. APD patients also reported higher rates of aggression and legal problems. APD, and to a lesser extent CD only, was associated with more severe psychiatric symptoms, an earlier age of onset of substance abuse, more severe symptoms of substance abuse, and a stronger family history of substance abuse and psychiatric hospitalization. The findings suggest that schizophrenia patients with APD represent a high-risk subgroup vulnerable to more severe substance abuse, psychiatric impairment, aggression, and legal problems. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

An examination of the structure of self-report psychopathy measures and their relations with general traits and externalizing behaviors.

Self-report assessment of psychopathy is plagued by inconsistencies among the relations of the various psychopathy factors. We examined the factor structure of 3 prominent self-report measures of psychopathy—the Self-Report Psychopathy Scale–III (SRP–III; Williams, Paulhus, & Hare, 2007), the Levenson Self-Report Psychopathy Scale (LSRP; Levenson, Kiehl, & Fitzpatrick, 1995), and the Psychopathic Personality Inventory–R (PPI–R; Lilienfeld & Widows, 2005). A coherent 4-factor structure resulted from conducting an exploratory factor analysis (EFA) of the psychopathy subscales along with the domains from the five-factor model. Two of these factors were consistent with traditional conceptualizations of a 2-factor structure of psychopathy (i.e., Factor 1, which loaded negatively with Agreeableness; Factor 2, which loaded negatively with Conscientiousness), while 2 additional factors emerged, 1 of which emphasized low Neuroticism and 1 of which emphasized traits related to novelty/reward-seeking and dominance-related personality traits (high Extraversion). We also investigated the relations of these factors with a variety of externalizing behaviors (EB). The psychopathy scales indicative of interpersonal antagonism (i.e., Factor 1) were most consistently and strongly related to EB. Our findings are discussed in terms of the importance of a trait-based perspective in the assessment of psychopathy. (PsycINFO Database Record (c) 2011 APA, all rights reserved)     

Psychopathy and conduct problems in children.

Factor analysis of a measure of psychopathy was conducted in a sample of 95 clinic-referred children between the ages of 6 and 13 yrs. These analyses revealed 2 dimensions of behavior, one associated with impulsivity and conduct problems (I/CP) and one associated with the interpersonal and motivational aspects of psychopathy (callous/unemotional: CU). In a subset of this sample (n?=?64), analyses indicated that scores on the I/CP factor were highly associated with traditional measures of conduct problems. In contrast, scores derived from the CU factor were only moderately associated with measures of conduct problems and exhibited a different pattern of associations on several criteria that have been associated with psychopathy (e.g., sensation seeking) or childhood antisocial behavior (e.g., low intelligence, poor school achievement, and anxiety). These analyses suggest that psychopathic personality features and conduct problems are independent, yet interacting, constructs in children, analogous to findings in the adult literature. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Clarifying the role of defensive reactivity deficits in psychopathy and antisocial personality using startle reflex methodology.

Prior research has demonstrated deficits in defensive reactivity (indexed by potentiation of the startle blink reflex) in psychopathic individuals. However, the basis of this association remains unclear, as diagnostic criteria for psychopathy encompass two distinct phenotypic components that may reflect differing neurobiological mechanisms—an affective–interpersonal component and an antisocial deviance component. Likewise, the role of defensive response deficits in antisocial personality disorder (APD), a related but distinct syndrome, remains to be clarified. In the current study, the authors examined affective priming deficits in relation to factors of psychopathy and symptoms of APD using startle reflex methods in 108 adult male prisoners. Deficits in blink reflex potentiation during aversive picture viewing were found in relation to the affective–interpersonal (Factor 1) component of psychopathy, and to a lesser extent in relation to the antisocial deviance (Factor 2) component of psychopathy and symptoms of APD—but only as a function of their overlap with affective–interpersonal features of psychopathy. These findings provide clear evidence that deficits in defensive reactivity are linked specifically to the affective–interpersonal features of psychopathy and not to the antisocial deviance features represented most strongly in APD. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Factor structure of the Psychopathy Checklist.

The Psychopathy Checklist (PCL) is a reliable and valid instrument for the assessment of psychopathy in criminal populations. Although it was designed to measure a unitary construct, the instrument has been shown to comprise several factors. To determine whether the PCL contains a factor structure that is stable and replicable, we factor-analyzed data from six samples of male prison inmates (N?=?1,119) in Canada, the United States, and England. Split-half cross-validation and analysis of congruence coefficients indicated that a two-factor solution could be replicated in all six samples. Factor 1 was defined by core personality traits, including superficiality; habitual lying and manipulation; callousness; and lack of affect, guilt, remorse, and empathy. Factor 2 was defined by a chronically unstable and antisocial lifestyle. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Alcohol and drug abuse-dependence disorders in psychopathic and nonpsychopathic criminal offenders.

Co-occurrence of psychopathy (assessed with the Revised Psychopathy Checklist [R. D. Hare, 1985]) and lifetime Diagnostic and Statistical Manual of Mental Disorders (DSM-III) alcohol and drug disorders (assessed with the Diagnostic Interview Schedule; National Institute of Mental Health) was examined in a sample of 360 male inmates. Consistent with previous research that used diagnoses of antisocial personality disorder, psychopaths were more likely than nonpsychopaths to have lifetime diagnoses of alcoholism, any drug disorder, and multiple drug disorder. The relation between substance abuse and the 2 factors of the Revised Psychopathy Checklist was also examined. Substance abuse was significantly related to general social deviance (Factor 2) but was unrelated to core personality features of psychopathy (Factor 1). Two possible models of psychopathy (unitary syndrome vs dual-diathesis model) are presented that may account for the association between psychopathy and substance abuse. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Assessing psychopathic attributes in a noninstitutionalized population.

Examined antisocial dispositions in 487 university students. Primary and secondary psychopathy scales were developed to assess a protopsychopathic interpersonal philosophy. An antisocial action scale also was developed for purposes of validation. The primary, secondary, and antisocial action scales were correlated with each other and with boredom susceptibility and disinhibition but not with experience seeking and thrill and adventure seeking. Secondary psychopathy was associated with trait anxiety. Multiple regression analysis revealed that the strongest predictors of antisocial action were disinhibition, primary psychopathy, secondary psychopathy, and sex, whereas thrill and adventure seeking was a negative predictor. This argues against a singular behavioral inhibition system mediating both antisocial and risk-taking behavior. These findings are also consistent with the view that psychopathy is a continuous dimension. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Detecting psychopathy from thin slices of behavior.

This study is the first to demonstrate that features of psychopathy can be reliably and validly detected by lay raters from “thin slices” (i.e., small samples) of behavior. Brief excerpts (5 s, 10 s, and 20 s) from interviews with 96 maximum-security inmates were presented in video or audio form or in both modalities combined. Forty raters used these excerpts to complete assessments of overall psychopathy and its Factor 1 and Factor 2 components, various personality disorders, violence proneness, and attractiveness. Thin-slice ratings of psychopathy correlated moderately and significantly with psychopathy criterion measures, especially those related to interpersonal features of psychopathy, particularly in the 5- and 10-s excerpt conditions and in the video and combined channel conditions. These findings demonstrate that first impressions of psychopathy and related constructs, particularly those pertaining to interpersonal functioning, can be reasonably reliable and valid. They also raise intriguing questions regarding how individuals form first impressions and about the extent to which first impressions may influence the assessment of personality disorders. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Refining the construct of psychopathy: Towards a hierarchical model.

Psychopathy is characterized by diverse indicators. Clinical accounts have emphasized 3 distinct facets: interpersonal, affective, and behavioral. Research using the Psychopathy Checklist–Revised (PCL–R), however, has emphasized a 2-factor model. A review of the literature on the PCL–R and related measures of psychopathy, together with confirmatory factor analysis of PCL–R data from North American participants, indicates that the 2-factor model cannot be sustained. A 3-factor hierarchical model was developed in which a coherent superordinate factor, Psychopathy, is underpinned by 3 factors: Arrogant and Deceitful Interpersonal Style, Deficient Affective Experience, and Impulsive and Irresponsible Behavioral Style. The model was cross-validated on North American and Scottish PCL–R data, Psychopathy Screening Version data, and data derived from the Diagnostic and Statistical Manual of Mental Disorders (4th ed.; American Psychiatric Association, 1994) antisocial personality disorder field trial. (PsycINFO Database Record (c) 2011 APA, all rights reserved)