Jonathan Shedler

Refining the Construct of Narcissistic Personality Disorder: Diagnostic Criteria and Subtypes

OBJECTIVE Narcissistic personality disorder has received relatively little empirical attention. This study was designed to provide an empirically valid and clinically rich portrait of narcissistic personality disorder and to identify subtypes of the disorder. METHOD A random national sample of psychiatrists and clinical psychologists (N=1,201) described a randomly selected current patient with personality pathology. Clinicians provided detailed psychological descriptions of the patients using the Shedler-Westen Assessment Procedure-II (SWAP-II), completed a checklist of axis II diagnostic criteria, and provided construct ratings for each axis II personality disorder. Descriptions of narcissistic patients based on both raw and standardized SWAP-II item scores were aggregated to identify, respectively, the most characteristic and the most distinctive features of narcissistic personality disorder. RESULTS A total of 255 patients met DSM-IV criteria for narcissistic personality disorder based on the checklist and 122 based on the construct ratings; 101 patients met criteria by both methods. Q-factor analysis identified three subtypes of narcissistic personality disorder, which the authors labeled grandiose/malignant, fragile, and high-functioning/exhibitionistic. Core features of the disorder included interpersonal vulnerability and underlying emotional distress, along with anger, difficulty in regulating affect, and interpersonal competitiveness, features that are absent from the DSM-IV description of narcissistic personality disorder. CONCLUSIONS These findings suggest that DSM-IV criteria for narcissistic personality disorder are too narrow, underemphasizing aspects of personality and inner experience that are empirically central to the disorder. The richer and more differentiated view of narcissistic personality disorder suggested by this study may have treatment implications and may help bridge the gap between empirically and clinically derived concepts of the disorder.

Refining the Measurement of Axis II: A Q-sort Procedure for Assessing Personality Pathology.

The measurement of personality disorders (PDs) has proven to be a difficult enterprise. This article describes two initial studies of the validity and reliability of the Shedler-Westen Assessment Procedure (SWAP), a Q-sort procedure that quantifies clinical judgment, which may be useful both for assessing personality pathology and for empirically refining Axis II categories and diagnostic criteria. In the first study, 153 clinicians from a random national sample used a version of the Q-sort to describe either a prototype or actual patient with either a borderline, antisocial, histrionic, or narcissistic personality disorder. Correlations between aggregated prototype and actual patient profiles provided evidence for convergent and discriminant validity, and a cluster-analytic procedure (Q-factor analysis) produced revised criteria for the four disorders that minimized the problem of comorbidity. In Study 2, a pilot sample of patients were interviewed using a clinical research interview that mirrors the way clinicians assess personality and PDs. The study yielded promising results with respect to the possibility of obtaining reliable Q-sort descriptions based on an interview that resembles a clinical interview rather than the direct-question format used in current Axis II structured interviews. It also produced strong correlations between Q-sort descriptions made by interview and those made independently by the treating clinician, further supporting the validity of the instrument. The findings suggest the potential utility of the SWAP as a measure of PDs and as a method for empirically refining Axis II categories and criteria.

Clinical utility of five dimensional systems for personality diagnosis: a "consumer preference" study.

This study compares the clinical relevance and utility of five dimensional diagnostic systems for personality disorders that have been proposed for the forthcoming edition of DSM (DSM-V): (1) a criteria counting model based on current DSM-IV diagnostic criteria; (2) a prototype matching model based on current DSM-IV diagnostic criteria; (3) a prototype matching model based on the Shedler-Westen Assessment Procedure (SWAP); (4) the Five Factor Model; and (5) Cloningers Psychobiological Model. A random national sample of psychiatrists and psychologists applied all 5 diagnostic systems to a patient in their care and rated the clinical utility of each system. The SWAP Prototype Matching and DSM-IV Prototype Matching models were judged most clinically useful and relevant. The Five Factor Model and Cloningers Psychobiological Model were judged least useful. The prototype matching systems most faithfully capture the personality syndromes seen in clinical practice, and permit rich descriptions of diagnostic constructs without a proportionate increase in user effort. A prototype matching approach to personality diagnosis deserves consideration for DSM-V.

The Shedler-Westen Assessment Procedure (SWAP) Evaluating Psychometric Questions About Its Reliability, Validity, and Impact of Its Fixed Score Distribution

The Shedler-Westen Assessment Procedure (SWAP) is a personality assessment instrument designed for use by expert clinical assessors. Critics have raised questions about its psychometrics, most notably its validity across observers and situations, the impact of its fixed score distribution on research findings, and its test-retest reliability. We review empirical data addressing its validity, emphasizing the multitrait-multimethod approach to evaluating test validity. To evaluate the hypothesis that the fixed, asymmetric score distribution artifactually inflates correlations between SWAP profiles, we conducted Monte Carlo simulations and also presented empirical data from a large patient sample. We observed a mean correlation of zero between simulated SWAP profiles, indicating that the score distribution does not impact the correlation coefficients. Empirical correlations between SWAP profiles of actual patients were small and similar to those obtained using Diagnostic and Statistical Manual of Mental Disorders, fourth edition (DSM-IV) personality disorder scales that had no fixed score distributions, suggesting that the correlations were not a methodological artifact of the SWAP. We report new test-retest reliability data (median coefficient > .85) for the SWAP’s trait and personality disorder dimensions. The SWAP appears to be reliable and valid. The data do not support its primary psychometric critiques.

DIMENSIONS OF PERSONALITY AND PERSONALITY PATHOLOGY: FACTOR STRUCTURE OF THE SHEDLER-WESTEN ASSESSMENT PROCEDURE-II (SWAP-II)

Researchers have proposed replacing the current system for diagnosing personality disorders with a dimensional trait model. Proposed trait models have been derived primarily from data provided by untrained lay informants (often via self-report questionnaires) using item sets derived from lay conceptions of personality. An alternative is to derive personality trait dimensions from data provided by clinically expert informants using an instrument that includes personality features salient to clinicians who treat personality dysfunction. The authors report the factor structure of the latest edition of the Shedler-Westen Assessment Procedure (SWAP-II) using a normative clinical sample of 1,201 North American patients assessed by experienced psychologists and psychiatrists. Factor analysis identified 14 clinically and empirically coherent factors. The findings highlight dimensions of personality and personality pathology that have not emerged in personality item sets designed for lay personality description.

Una tassonomia delle diagnosi di personalità derivata empiricamente : colmare il divario tra scienza e clinica nella concettualizzazione della personalità

Viene presentato un sistema diagnostico della patologia di personalita derivato empiricamente, clinicamente rilevante e di agevole uso quotidiano. Un campione randomizzato di 1.201 psichiatri e psicologi clinici statunitensi ha descritto un proprio paziente, selezionato in modo casuale e affetto da un disturbo della personalita, utilizzando la Shedler-Westen Assessment Procedure-II (SWAP-II). L’analisi fattoriale ha prodotto 10 diagnosi di personalita, clinicamente coerenti, organizzate in tre cluster sovraordinati: internalizzante, esternalizzante e borderline-disregolato. Le descrizioni col punteggio piu elevato sono state selezionate per costruire un prototipo di ogni sindrome di personalita. In un secondo campione indipendente, i ricercatori e i clinici sono stati in grado di diagnosticare le sindromi di personalita con un elevato accordo e un livello minimo di comorbilita. Questi 10 prototipi diagnostici sono empiricamente fondati e clinicamente rilevanti.