Does Researcher Allegiance Bias Outcomes in Psychotherapy Research? A Quasi-Experimental Secondary Analysis.

Researchers who conduct studies comparing the efficacy of two treatments often find that their preferred treatment outperforms the comparison treatment. This finding has been labelled the allegiance association. Although this association is robust, it is unclear whether it reflects an allegiance bias on the part of the researchers or whether it is noncausal, with researchers being allied to the more effective treatments. This study applied a quasi-experimental method proposed by a previous study to 19 pairs of treatment comparison studies. Each member of a pair had used the same two psychotherapies to treat clients with the same disorder, but the researchers in each of the two studies had opposing allegiances. If the authors of one study in the pair concluded that their preferred treatment was superior and the authors of the other study concluded that their preferred treatment was superior or that the two treatments were equivalent, these patterns would suggest allegiance bias. In 10 of the 19 pairs, the patterns were consistent with the operation of an allegiance bias, indicating that although allegiance biases are not inevitable, they are ubiquitous. Practitioners and other psychotherapy research consumers should use caution when interpreting the findings from treatment comparison studies.

Construction and Preliminary Validation of Machiavellianism Scales From the HEXACO-100.

Machiavellian individuals are callous, manipulative, and misanthropic, and they are also strategic and capable of delaying gratification. Many commonly used measures of Machiavellianism focus on the antagonistic aspects of Machiavellianism and devote few items to the strategic aspects of this construct. Because the HEXACO framework includes an Honesty-Humility factor, it may be especially capable of characterizing the full range of Machiavellian characteristics. The current study used a consensus-rating approach to create Machiavellianism scales using items from the HEXACO-100. This approach yielded two HEXACO-Machiavellianism scales that were labeled HEXACO-Manipulative and HEXACO-Disciplined. Data from five community and college student samples were used to examine the internal consistency and validity of these HEXACO-Machiavellianism scales. The scales demonstrated acceptable internal consistency and displayed promising convergent and discriminant validity with criterion variables, including other Machiavellianism scales. The HEXACO-Manipulative and HEXACO-Disciplined scales were negatively correlated, suggesting that Machiavellianism may be better understood as an emergent trait.

Construction and preliminary validation of an inconsistent responding scale for the HEXACO-100.

Inconsistent responding poses a particular risk to self-report data and is a common phenomenon in undergraduate and community subject pools. The HEXACO-100 personality inventory (Lee & Ashton, 2018) lacks internal validity scales that could be used to identify inconsistent responding. To address this need, the present study developed a HEXACO Inconsistent Responding Test (HIRT). Highly correlated and conceptually overlapping HEXACO-100 item pairs were identified from a derivation sample and cross-validated by comparing real data to randomly generated protocols. The HIRT was highly accurate at identifying both randomly generated and half-randomly generated protocols. HIRT scores exhibited significant correlations with other inconsistency measures (i.e., the Triarchic Assessment Procedure for Inconsistent Responding and the HEXACO's Inter-item Standard Deviation) and were as effective as these other measures at differentiating between consistent and inconsistent responders. This preliminary validation of the HIRT provides strong evidence of its ability to improve the quality of data gathered with the HEXACO-100, which may be especially useful for researchers hoping to utilize the measure in clinically relevant research and applications. (PsycInfo Database Record (c) 2023 APA, all rights reserved).

Bipolar disorders and narcissism: Diagnostic concerns, conceptual commonalities and potential antecedents.

Narcissistic personality disorder (NPD) and the manic and hypomanic episodes found in the bipolar disorders are characterized by grandiosity. It is possible that this shared grandiosity is a 'homologous structure' or reflects a superficial similarity between two disparate conditions. It is, however, possible that NPD and the bipolar disorders are more closely related than implied by their segregation into the separate superordinate categories of personality disorders and mood disorders. Whereas narcissism is considered to be a life-course, stable trait and the bipolar disorders are characterized by episodes of mania and depression, there is considerable research indicating that narcissism may be linked to mood instability (including depression) and bipolar disorder may have a pervasive personality component (i.e., hypomanic personality). Utilizing dimensional models of psychopathology, the current review examined the evidence linking narcissism and the bipolar disorders and suggests that considerable overlap may exist in the domains associated with reward-seeking, harm avoidance and social functioning.

Brazilian Portuguese adaptation of the spitefulness scale and associations with personality traits.

Spitefulness is a personality trait characterized by an inclination to cause harm to others in a manner that also results in self-harm. Studies considering this trait have mostly been performed in individualistic cultures. Our aim was to adapt and accumulate statistical evidence for the Brazilian Portuguese version of the Spitefulness Scale (SS-BP), examining the functioning of the instrument in a collectivist culture. Study 1 adapted the instrument, investigated dimensionality, and examined item functioning and gender invariance in a sample of 766 participants (53.4% male) aged between 18 and 63 years old (M = 23.71; SD = 7.92). Study 2 examined the association of spitefulness with aversive and healthy personality traits (i.e., the dark triad, honesty-humility, emotionality, extroversion, agreeableness, conscientiousness, and openness [HEXACO], antagonism, and disinhibition) in a sample of 288 individuals (mostly women 84.7%) between 18 and 71 years old (M = 41.82; SD = 13.04). Similar to the original instrument, the SS-BP was unidimensional and there was measurement invariance with respect to gender. Men were more spiteful than women. Spitefulness yielded large correlations with psychopathy, deceitfulness, and irresponsibility. The SS-BP appears to present adequate psychometric properties for Brazilian samples. (PsycInfo Database Record (c) 2022 APA, all rights reserved).

Item response theory analysis of the Triarchic Psychopathy Measure.

This study investigated item and scale functioning in the triarchic psychopathy measure (TriPM) using an item response theory (IRT) analysis. TriPM data collected from 937 (410 men and 527 women) college students and community members were analyzed. A graded response model was utilized to analyze the items comprising the TriPM's three scales. Exploratory factor analyses (EFAs) supported the unidimensionality of the Disinhibition and Meanness scales, whereas Boldness was best represented by two domains. Each TriPM scale was found to include some items that had limited ability to differentiate between respondents possessing varying levels of the trait being measured. Across all scales, 34 items (61%) yielded evidence of significantly different responding between men and women possessing similar levels of the underlying trait, or differential item functioning (DIF). The scoring format (i.e., directly scored vs. reverse scored) also influenced item functioning, especially when the given scale included a large majority of one scoring type. Overall, the IRT and DIF results suggest that the TriPM effectively identifies disinhibition and meanness in individuals possessing high levels of those traits, and boldness at lower levels, but does not seem to identify these traits equally well in men and women. Possible revisions to the Boldness scale as well as ideas for addressing female and male DIF were provided. (PsycInfo Database Record (c) 2021 APA, all rights reserved).

Evidence for the taxonic latent structure for DSM-5 intermittent explosive disorder in adults.

BACKGROUND: Identification of individuals with clinically significant aggressive behavior is critical for the prevention and management of human aggressive behavior. A previous population-based taxometric study reported that the Diagnostic and Statistical Manual of Mental Disorders-4th Edition (DSM-IV) intermittent explosive disorder (IED) belongs to its own discrete class (taxon) rather than existing along a continuum. METHODS: This study sought to extend previous population-based findings in a clinical research sample of adults with DSM-5 IED (n = 346), adults with non-aggressive DSM-5 disorders (n = 293), and adults without any DSM-5 disorder (n = 174), using standardized assessments of DSM-5 diagnoses, aggression, and other related measures not available in past studies. RESULTS: Analyses revealed a taxonic latent structure that overlapped with the DSM-5 diagnosis of IED. Within the sample, taxon group members had higher scores on a variety of measures of psychopathology than did the complement members of the sample. Comorbidity of other diagnoses with IED did not affect these results. CONCLUSION: These findings support the proposition that DSM-5 IED represents a distinct behavioral disorder rather than the severe end of an aggressive behavior continuum.

The latent structure of cannabis misuse: A taxometric analysis.

Taxometric research on substance use problems has yielded inconsistent results, with some studies yielding evidence of a taxonic (categorical) latent structure and other studies yielding dimensional findings. The 2 previous studies that specifically examined cannabis misuse supported a dimensional latent structure. However, given the inconsistent findings for other substance use disorders and the changing legal status of, attitudes about, and patterns of cannabis use, the present study examined the latent structure of cannabis misuse in an attempt to replicate these previous findings. Participants were 804 cannabis using college students who completed measures of cannabis use anonymously online to reduce response biases. Consistent with previous research, the taxometric analyses yielded clear evidence that cannabis misuse has a dimensional latent structure. Furthermore, compared to a dichotomous measure of cannabis misuse, continuous measures of cannabis misuse were significantly more strongly associated with external correlates of cannabis misuse (e.g., stress). These findings have implications for the assessment, treatment, and study of cannabis use disorder. (PsycInfo Database Record (c) 2020 APA, all rights reserved).

Construction and preliminary validation of Triarchic Psychopathy Scales from the HEXACO-100.

According to the triarchic model, psychopathy encompasses 3 distinct dispositional constructs: boldness, meanness, and disinhibition. Although the Triarchic Psychopathy Measure was designed to assess these 3 constructs, researchers have developed alternative triarchic scales using both omnibus measures of general personality and existing psychopathy scales. The components of the HEXACO model of personality may be especially capable of characterizing the dimensions of the triarchic model of psychopathy. The current study used a consensus-rating approach to create triarchic scales using items from the HEXACO-100. Data from 3 community and college student samples were used to examine the internal consistency, and convergent and discriminant validity of these newly developed HEXACO-Triarchic scales. The scales consistently demonstrated good internal consistency and displayed promising convergent and discriminant validity with theoretically predicted criterion variables. The lone exception was that HEXACO-Meanness and HEXACO-Disinhibition were similarly related to other triarchic measures of meanness. The implications of these findings for the integration of the HEXACO and triarchic models are discussed. (PsycINFO Database Record (c) 2019 APA, all rights reserved).

Item Response Theory Analysis of the Psychopathic Personality Inventory-Revised.

This study examined item and scale functioning in the Psychopathic Personality Inventory-Revised (PPI-R) using an item response theory analysis. PPI-R protocols from 1,052 college student participants (348 male, 704 female) were analyzed. Analyses were conducted on the 131 self-report items comprising the PPI-R's eight content scales, using a graded response model. Scales collected a majority of their information about respondents possessing higher than average levels of the traits being measured. Each scale contained at least some items that evidenced limited ability to differentiate between respondents with differing levels of the trait being measured. Moreover, 80 items (61.1%) yielded significantly different responses between men and women presumably possessing similar levels of the trait being measured. Item performance was also influenced by the scoring format (directly scored vs. reverse-scored) of the items. Overall, the results suggest that the PPI-R, despite identifying psychopathic personality traits in individuals possessing high levels of those traits, may not identify these traits equally well for men and women, and scores are likely influenced by the scoring format of the individual item and scale.

Externalizing Behavior and Psychopathy: A Social Relations Analysis.

Most conceptualizations of psychopathy emphasize its interpersonal consequences, yet most research on psychopathy has been conducted at the individual level. In small groups, well-acquainted members of sororities and fraternities (N = 111) rated one another and themselves on a variety of externalizing behaviors (e.g., cheating, risky sex), and completed a self-report measure of psychopathy. There was consensus about the extent to which members of the groups engaged in these behaviors. The associations between these target effects and respondents' self-reports suggest that these consensual judgments were reasonably accurate. Individuals who reported higher levels of psychopathic personality traits were seen as more likely to engage in externalizing behaviors, with self-centered impulsivity most strongly associated with these behaviors. Although fearless dominance was unrelated to self-reported externalizing behaviors, it was related to peers' ratings of marijuana use, academic dishonesty, and future legal troubles, suggesting that individuals high in fearless dominance may underreport their problem behaviors.

Further evidence that suicide risk is categorical: A taxometric analysis of data from an inpatient sample.

Recent research by Witte and colleagues (2017) revealed a taxonic structure for classifying suicide risk using a sample of predominantly military outpatients. The authors sought to replicate the Witte et al. (2017) findings using data from a sample of 2,385 psychiatric inpatients who completed measures of suicidal ideation and behavior upon admission to the hospital. The comparison curve fit index values for means above minus below a cut (.80), maximum eigenvalue (.71), and latent mode (.52) showed a similar taxonic structure (i.e., dichotomous rather than continuous). Consistent with Witte et al. (2017), differences between the taxon and complement groups were larger for variables conceptually directly related to suicide risk than to broader constructs such as hopelessness or depression. Support for this categorical distinction among a sample of long-term psychiatric inpatients, who are uniformly high in symptom severity, emphasizes the need for additional research on this high-risk group and development of further assessment methods. (PsycINFO Database Record (c) 2018 APA, all rights reserved).

Network analysis of psychopathy in forensic patients.

The question of which features represent the most central components of psychopathy remains unresolved and is the subject of considerable debate. Network analysis, which is a relatively new way to conceptualize mental disorders that emphasizes complex causal systems, provides a means to graphically and quantitatively describe the centrality of the various symptoms of a disorder. We applied association and adaptive LASSO networks on two samples of forensic patients. The first sample included forensic inpatients (N = 277) who were administered the Psychopathy Checklist-Revised (Hare, 2003), and the second sample included patients who previously had been civilly committed (N = 1136), who were administered the Psychopathy Checklist: Screening Version (Hart, Cox, & Hare, 1995). The models indicated the items on the affective facet are highly central across both samples and methods, and the item "lack of remorse" was especially central to the networks. Conversely, interpersonal, lifestyle, and antisocial facets generally resulted in low centrality in the models of both samples. Thus, the models lend support to the importance of affective deficits as the primary feature of psychopathy when psychopathy is assessed using the Hare Psychopathy Checklist measures. (PsycINFO Database Record

Identifying Careless Responding With the Psychopathic Personality Inventory-Revised Validity Scales.

The Psychopathic Personality Inventory-Revised (PPI-R) includes validity scales that assess Deviant Responding (DR), Virtuous Responding, and Inconsistent Responding. We examined the utility of these scales for identifying careless responding using data from two online studies that examined correlates of psychopathy in college students (Sample 1: N = 583; Sample 2: N = 454). Compared with those below the cut scores, those above the cut on the DR scale yielded consistently lower validity coefficients when PPI-R scores were correlated with corresponding scales from the Triarchic Psychopathy Measure. The other three PPI-R validity scales yielded weaker and less consistent results. Participants who completed the studies in an inordinately brief amount of time scored significantly higher on the DR and Virtuous Responding scales than other participants. Based on the findings from the current studies, researchers collecting PPI-R data online should consider identifying and perhaps screening out respondents with elevated scores on the DR scale.

Homosexuality as a Discrete Class.

Previous research on the latent structure of sexual orientation has returned conflicting results, with some studies finding a dimensional structure (i.e., ranging quantitatively along a spectrum) and others a taxonic structure (i.e., categories of individuals with distinct orientations). The current study used a sample (N = 33,525) from the National Epidemiologic Survey on Alcohol and Related Conditions (NESARC). A series of taxometric analyses were conducted using three indicators of sexual orientation: identity, behavior, and attraction. These analyses, performed separately for women and men, revealed low-base-rate same-sex-oriented taxa for men (base rate = 3.0%) and women (base rate = 2.7%). Generally, taxon membership conferred an increased risk for psychiatric and substance-use disorders. Although taxa were present for men and women, women demonstrated greater sexual fluidity, such that any level of same-sex sexuality conferred taxon membership for men but not for women.

Is the Dodo bird endangered in the 21st century? A meta-analysis of treatment comparison studies.

The Dodo bird hypothesis asserts that when bona fide treatments are compared they yield similar outcomes and this hypothesis is consistent with a common factors or contextual model of psychotherapy. Wampold et al. (1997), the most recent comprehensive meta-analysis to test the Dodo bird hypothesis, yielded consistent evidence of treatment equivalence. However, some of Wampold et al.'s analytic strategies, such as using multiple effect sizes from the same study and prioritizing long-term follow-up, may have obscured treatment differences. The current meta-analysis updated Wampold et al. by analyzing studies published in the subsequent 16 years (k=51). Separate effect sizes were calculated for primary outcomes versus secondary outcomes, at termination and follow-up. Contrary to the Dodo bird hypothesis, there was evidence of treatment differences for primary outcomes at termination. Furthermore, cognitive-behavioral treatments may be incrementally more effective than alternative treatments for primary outcomes. Consistent with the Dodo bird hypothesis, there was little evidence of treatment differences for the secondary outcomes at termination and follow-up. There are small, statistically significant differences between bona-fide treatments when the specific targets of those treatments are assessed, but not when secondary outcomes are assessed, providing mixed support for both specific factors and contextual models of psychotherapy.

Optimists or optimistic? A taxometric study of optimism.

Although most researchers have assumed that optimism exists on a continuum, it is not uncommon for researchers to dichotomize their data into optimists and pessimists, thus treating optimism as a categorical or taxonic variable. To address the question of whether optimism is dimensional or taxonic, the authors performed a set of taxometric analyses on 3 indicators derived from measures of hope and optimism using data from 510 college students. The results provided consistent evidence that optimism is dimensional. Colloquially, people may speak of optimists and pessimists, but researchers should avoid dichotomizing this continuous variable.

The psychology of spite and the measurement of spitefulness.

Spite is an understudied construct that has been virtually ignored within the personality, social, and clinical psychology literatures. This study introduces a self-report Spitefulness Scale to assess individual differences in spitefulness. The scale was initially tested on a large sample of 946 college students and cross-validated on a national sample of 297 adults. The scale was internally consistent in both samples. Factor analysis supported a 1-factor solution for the initial pool of 31 items. Item response theory analysis was used to identify the best performing of the original 31 items in the university sample and reduce the scale to 17 items. Tests of measurement invariance indicated that the items functioned similarly across both university and national samples, across both men and women, and across both ethnic majority and minority groups. Men reported higher levels of spitefulness than women, younger people were more spiteful than older people, and ethnic minority members reported higher levels of spitefulness than ethnic majority members. Across both samples, spitefulness was positively associated with aggression, psychopathy, Machiavellianism, narcissism, and guilt-free shame, and negatively correlated with self-esteem, guilt-proneness, agreeableness, and conscientiousness. Ideally, this Spitefulness Scale will be able to predict behavior in both laboratory settings (e.g., ultimatum games, aggression paradigms) and everyday life, contribute to the diagnosis of personality disorders and oppositional defiant disorder, and encourage further study of this neglected, often destructive, trait.

The latent structure of generalized anxiety disorder in midlife adults.

Generalized anxiety disorder (GAD) is identified as a discrete disorder in the DSM-5, but evidence suggests that GAD and the related construct of pathological worry possesses a dimensional latent structure. The objective of this study was to ascertain the latent structure of GAD using taxometric methods. A subsample of adults (N=2061) from the Midlife in the United States Study, a national sample of Americans, provided the data. Additional data from individuals who were re-interviewed 10 year later (n=1228) were also analyzed. Items corresponding to the DSM-IV-TR diagnostic criteria for GAD were used to generate indicators for the taxometric analyses. Multiple taxometric procedures provided no evidence that GAD has a categorical or taxonic latent structure. Instead, the results were more consistent with the proposition that GAD exists on a continuum. Evidence that GAD is dimensional suggests that dichotomizing individuals into GAD versus non-GAD groups will typically result in decreased statistical power. They also suggest that any diagnostic thresholds for identifying GAD are likely to be arbitrary. The findings are consistent with models that locate GAD within the framework of extant dimensional models of personality and with research that emphasizes a multifactorial etiology for GAD.

A new measure of attitudes toward sexually predatory tactics and its relation to the triarchic model of psychopathy.

Psychopathic personality traits are associated with a variety of sexually coercive behaviors. The current study introduced a new measure of attitudes toward sexually predatory tactics and used the triarchic conceptualization of psychopathy as a framework for understanding the association between psychopathy and sexual coercion. The new measure, in which respondents rate the behaviors of men employing various sexually coercive tactics, had a two-component structure and was associated with other measures of problematic sexual behaviors. For the vignettes describing manipulative behaviors, men who were bolder, meaner, and more disinhibited rated these behaviors as more acceptable and as behaviors they would be more likely to enact. There was also an interaction between boldness and disinhibition: At higher levels of boldness, disinhibition became a stronger predictor of positive attitudes toward these behaviors. Only disinhibition was related to reporting more positive attitudes toward vignettes describing more extreme and potentially criminal predatory behaviors.