Structure of the DSM-IV personality disorders as revealed in clinician ratings

Underlying Dimensions of Borderline Personality Disorder: A Systematic Review of Factor Analytic Studies

Borderline personality disorder (BPD) is considered to be a heterogeneous diagnostic entity, with multiple facets of the disorder influencing its course. Disentangling the structure of BPD criteria is fundamental to better understanding the disorder and targeting problematic behaviors. To identify and critically appraise factor analytic studies examining the structure of BPD criteria. A systematic review was conducted according to PRISMA guidelines. Three computerized databases (Pubmed, Scopus,PsycNET) were searched, resulting in the inclusion of 27 relevant studies. The unified model of BPD has been confirmed by a number of studies, while among multidimensional models, a three-factor model has also gained considerable empirical support. Multidimensional models of BPD tend to cluster together "disordered self" symptoms (identity disturbance and emptiness), affective symptoms (affective instability and anger), and behavioral symptoms (impulsivity and self-harming behaviors). Unidimensional and multidimensional models of the BPD structure are not necessarily in competition. An understanding of BPD as a unified diagnosis composed of three underlying dimensions, could serve the purpose of recognizing and targeting different aspects of the disorder, while maintaining a robust, and clinically useful diagnosis.

The current state and future of factor analysis in personality disorder research

The major debates in the personality disorder (PD) field center on the structure of personality pathology. Factor analysis is designed to elucidate the underlying structure of observed phenomena. Therefore, factor analysis has already played a major role in the debates about the structure of PD, and will continue to be an often-used and indispensable tool moving forward. However, misconceptions about the utility and interpretation of factor analyses abound. The purpose of this article is to provide a conceptual primer on available factor analytic techniques and how they have been applied in PD research, and to highlight novel ways of using factor analysis moving forward. The techniques reviewed include exploratory and confirmatory factor analysis, exploratory structural equation modeling, multilevel structural equation modeling, and person-specific (i.e., P-technique) factor analysis. Additionally, the notion that exploratory and confirmatory factor analytic approaches lie on an exploratory to confirmatory spectrum is introduced. Examples from the published literature are used to illustrate key points. (PsycINFO Database Record

The structure of borderline personality disorder symptoms: a multi-method, multi-sample examination

We examined the factor structure of borderline personality disorder (BPD) symptoms by using a multimethod, multisample approach. The factorial structure of BPD has previously been examined through the lens of broad retrospective reports of symptoms without directly contrasting results from different samples of participants, with studies producing inconsistent patterns of results. We go beyond previous work by examining symptoms from multiple timeframes and by examining results across and within 2 diagnostic groups-individuals with and without BPD. Participants (n = 281) completed a structured clinical interview for personality disorders, 2 weekly reports of BPD symptoms, and 2 weeks of in-the-moment "immediate" symptom reports, assessed 5 times daily. Across all participants, results revealed a robust 1-factor structure that replicated across all assessment methods. Moreover, these results replicated within each diagnostic group, with the lone exception of an unclear structure in interview assessment among participants who had a BPD diagnosis. Results have implications regarding the nature, assessment, and treatment of BPD.

Factor Analysis Demonstrates a Common Schizoidal Phenotype within Autistic and Schizotypal Tendency: Implications for Neuroscientific Studies

Behavioral and cognitive dysfunction, particularly social and communication impairments, are shared between autism and schizophrenia spectrum disorders, while evidence for a diametric autism-positive schizophrenia symptom profile is inconsistent. We investigated the shared phenotype at a personality trait level, particularly its resemblance to schizoid personality disorder, as well as differential aspects of the autism-schizophrenia model. Items of the autism spectrum quotient (AQ) and schizotypal personality questionnaire (SPQ) were pseudo-randomly combined, and were completed by 449 (162 male, 287 female) non-clinical participants aged 18-40. A factor analysis revealed three factors; the first represented a shared social disorganization phenotype, the second reflected perceptual oddities specific to schizotypy while the third reflected social rigidity specific to autism. The AQ and SPQ were strongly correlated with Factor 1 (AQ: r = 0.75, p < 0.001; SPQ: r = 0.96, p < 0.001), SPQ score was correlated with Factor 2 (r = 0.51, p < 0.001), particularly in cognitive-perceptual features (r = 0.66, p < 0.001), and AQ score was strongly correlated with Factor 3 (r = 0.76, p < 0.001). Furthermore, there was no relationship between Factor 1 and Factor 2. Thus, there is robust evidence for a shared social disorganization phenotype in autistic and schizotypal tendency, which reflects the schizoid phenotype. Discriminating and independent dimensions of schizotypal and autistic tendency exist in Factors 2 and 3, respectively. Current diagnostic protocols could result in different diagnoses depending on the instrument used, suggesting the need for neuromarkers that objectively differentiate autistic and schizotypal traits and resolve the question of commonality versus co-morbidity.

New diagnostic perspectives on obsessive-compulsive personality disorder and its links with other conditions

PURPOSE OF REVIEW

This review examines the conceptualization of obsessive-compulsive personality disorder (OCPD), its epidemiology and efforts to better understand the relationships between OCPD and other conditions.

RECENT FINDINGS

The alternative Fifth Edition of the Diagnostic and Statistical Manual of Mental Disorders conceptualization of OCPD is radically different in that it combines categorical and dimensional diagnostic approaches and introduces a hierarchy of diagnostic criteria. OCPD is one of the most common personality disorders in the general population. The relationship between OCPD and obsessive-compulsive disorder (OCD) is important, but to a large extent obfuscated by the overlap between their diagnostic criteria. Frequent changes in the OCPD diagnostic criteria make it difficult to ascertain the 'true' relationship between OCPD and OCD. It is not uncommon for OCPD to occur with anorexia nervosa, depression, hypochondriasis, certain other personality disorders and Parkinson's disease, but further research is necessary to understand the implications of these links.

SUMMARY

OCPD is yet to be conceptualized consistently and in the manner that would make a clear and well supported distinction between its core and peripheral features. Future studies need to separate a genuine from overlap-driven co-occurrence of OCPD and other conditions, as that would give a better insight into the way in which OCPD relates to other disorders.

Vestibular insights into cognition and psychiatry

The vestibular system has traditionally been thought of as a balance apparatus; however, accumulating research suggests an association between vestibular function and psychiatric and cognitive symptoms, even when balance is measurably unaffected. There are several brain regions that are implicated in both vestibular pathways and psychiatric disorders. The present review examines the anatomical associations between the vestibular system and various psychiatric disorders. Despite the lack of direct evidence for vestibular pathology in the key psychiatric disorders selected for this review, there is a substantial body of literature implicating the vestibular system in each of the selected psychiatric disorders. The second part of this review provides complimentary evidence showing the link between vestibular dysfunction and vestibular stimulation upon cognitive and psychiatric symptoms. In summary, emerging research suggests the vestibular system can be considered a potential window for exploring brain function beyond that of maintenance of balance, and into areas of cognitive, affective and psychiatric symptomology. Given the paucity of biological and diagnostic markers in psychiatry, novel avenues to explore brain function in psychiatric disorders are of particular interest and warrant further exploration.