Reliability and Validity of the Self-Report Version of the Yale-Brown Obsessive-Compulsive Scale Modified for Body Dysmorphic Disorder

Despite its frequent use in research studies, the self-report version of the Yale-Brown Obsessive-Compulsive Scale modified for Body Dysmorphic Disorder (BDD-YBOCS-SR) is yet to be formally validated. The present investigation sought to examine the psychometric properties of the BDD-YBOCS-SR across three different samples. In Study 1 (N = 847), we sought to explore the factor structure of the BDD-YBOCS-SR. In addition, we evaluated the convergent and divergent validity with similar self-report measures. In Study 2 (N = 187), the convergence of the BDD-YBOCS-SR with reactivity to an in vivo appearance-related task was observed. In Study 3, we compared scores on the BDD-YBOCS-SR between a clinical sample of individuals with BDD (n = 50) and a "healthy" control sample (n = 51). We further observed the BDD-YBOCS-SR's sensitivity to treatment and convergence with the rater-administered version in the clinical sample. The BDD-YBOCS-SR demonstrated strong psychometric properties across all three studies. Scores on the BDD-YBOCS-SR were found to be strongly associated with appearance anxiety, reactivity to the appearance task, and the rater-administered BDD-YBOCS. The present investigation provides support for the BDD-YBOCS-SR's utility in measuring body dysmorphic symptom severity for use in research and clinical settings.

Appearance-related safety behaviors predict symptoms of body dysmorphic disorder following internet-based treatment

Recent experimental evidence has found that appearance related safety behaviors (i.e., practices meant to avoid a perceived feared outcome) likely play a crucial role in maintaining symptoms of body dysmorphic disorder (BDD). The present study sought to determine if these behaviors predicted BDD symptom severity following treatment. Participants (N = 50) with BDD were randomized to either eight sessions of interpretation bias modification or progressive muscle relaxation. Both treatments led to reductions in BDD symptom severity and appearance-related safety behaviors, though moderate levels of safety behaviors persisted at both posttreatment and follow-up. Importantly, post-treatment appearance related safety behaviors significantly predicted BDD symptom severity at three-month follow-up. Taken together, the present findings suggest appearance related safety behaviors maintain BDD symptoms following effective computerized treatments and provide further evidence for their importance in the treatment of BDD.

A Multimethod Analysis of Incompleteness and Visual "Not Just Right" Experiences in Body Dysmorphic Disorder

Individuals with body dysmorphic disorder (BDD) often report engaging in repetitive behaviors aimed at reducing feelings of imperfection anchored to their appearance. "Not just right" experiences (NJREs) and incompleteness (INC) are constructs related to perfectionism that have traditionally been studied in obsessive-compulsive disorder, though recent research has also linked these phenomena to BDD. We sought to replicate and extend this research via two studies. Study 1 examined BDD symptoms, INC, as well as harm avoidance (HA) in an unselected sample (N = 179); moderate associations were observed between symptoms and both INC and HA. Participants also completed a novel visual NJRE task in which they were shown appearance-related and non-appearance-related images meant to evoke an NJRE response (i.e., discomfort and urge to "fix" stimuli). BDD symptoms predicted reactivity to appearance-related NJRE stimuli above negative affect. Study 2 compared INC, HA, and task reactivity in a BDD sample (N = 50) to nonpsychiatric controls (N = 44). The BDD group evidenced greater INC, HA, and reactivity to both appearance and nonappearance NJRE stimuli, relative to controls; however, group differences did not remain after controlling for age and negative affect. These studies broadly corroborate previous research highlighting NJREs and INC as potential vulnerability factors relevant to BDD, though these phenomena may not be specific to BDD symptoms.

Indices of change in exposure and response prevention for contamination-based OCD

Few studies have examined indices of change in treatment for obsessive compulsive disorder (OCD). The current study evaluated within- and between-session trajectories of fear, disgust, and urge to wash in exposure and response prevention (ERP) for contamination-based OCD and tested whether change in these indices were associated with treatment outcomes. Forty-one participants (75.6% female) engaged in three sessions of ERP for contamination OCD. Participants provided ratings of fear, disgust, and urge to wash during each session, and contamination symptoms were assessed at pre- and post-treatment and two-week follow-up. Fear, disgust, and urge to wash all significantly decreased both within and between sessions. Both fear and disgust declined significantly faster than urge to wash within session, though declines in fear and disgust did not significantly differ from each other. Within-session changes in fear were significantly associated with reduced symptoms at post-treatment, whereas within-session changes in disgust were associated with symptoms at two-week follow-up. The current study highlights the roles of fear and disgust in the context of ERP as unique indicators of treatment outcome for contamination-based OCD. Only within-session fear was uniquely associated with treatment outcome at post, while within-session disgust predicted outcome at follow-up. Theoretical and clinical implications are discussed.

A multi-method analysis of incompleteness in behavioral treatment of contamination-based OCD

Contamination fear and washing compulsions are among the most common symptoms of obsessive compulsive disorder (OCD). Though these symptoms have traditionally been viewed as being driven by a desire to avoid harm, recent research has highlighted the importance of feelings of incompleteness (INC) or not-just right experiences (NJREs) in this symptom dimension. However, no study to date has examined the extent to which INC/NJREs may be associated with treatment response for contamination symptoms. The current study used a multi-method approach to examine the role of INC/NJREs in treatment of contamination symptoms. Participants (n = 88) with elevated contamination symptoms, half of whom met for an OCD diagnosis, engaged in three sessions of exposure and response prevention (ERP) targeting contamination fears, and completed self-report and in vivo measures of INC/NJRES and contamination symptoms. ERP was associated with significant reductions in INC/NJREs. Further, changes in INC were associated with changes in contamination symptoms, independent of changes in harm avoidance. Greater discomfort in response to an in vivo NJRE task at pre-treatment predicted poor treatment response, though a self-report measure of INC did not predict response. These findings provide novel evidence for the importance of INC/NJREs in contamination-based OCD and its treatment.

An initial investigation of the unique relationship between disgust propensity and body dysmorphic disorder

Disgust is a universal emotion that has received recent empirical attention for its potential role in various forms of psychopathology. We conducted two studies using varying methods to explore the relationship between disgust propensity, a construct related to obsessive-compulsive symptomatology, and symptoms of body dysmorphic disorder (BDD). Study 1 found a significant and unique (i.e., above and beyond co-occurring depression and anxiety) relationship between higher disgust propensity and more severe BDD symptoms, as measured by a standardized self-report and via an in-vivo task aimed at eliciting BDD-related concerns (N = 200). In Study 2, a clinical sample of individuals with BDD (N = 50) reported higher disgust propensity compared to mentally healthy controls (N = 36). This finding remained significant when controlling for depression and anxiety. Findings are the first to our knowledge to demonstrate a relationship between disgust propensity and BDD symptoms and provide directions for future research exploring the role of disgust in BDD.