title: Obsessional beliefs, compulsive behaviours and symptom severity: their evolution and interrelation over stages of treatment.
abstract: The current study reports a case series examining (1) the variation in strength of obsessional doubt and belief in consequences of the doubt; and (2) the interaction between these cognitive components and symptom measures of duration and severity of obsessive-compulsive disorder (OCD), over 24 weeks of cognitive behaviour therapy. Eight participants diagnosed with OCD, four with contamination-related rituals and four with checking behaviours, were selected on the basis of the Yale-Brown obsessive-compulsive scale (Y-BOCS) and Padua ratings. All participants completed daily diaries measuring strength of principal obsessional doubt (0-100), strength of belief in consequences of the doubt (0-100) and the duration of the compulsive rituals throughout the 24 weeks of therapy. Severity of symptomatology was measured pre- and post-treatment using the Y-BOCS. Change in all measures was analysed over time following the procedure outlined by Storchheim and O'Mahoney (2006). Results showed that decrease in belief in secondary consequences is always accompanied by a decrease in strength of obsessions, but the converse does not hold. Furthermore, change in OCD symptomatology may precede cognitive changes.
authors.affiliation: Université du Québec à Montréal, Centre de recherche Fernand-Seguin, Montreal, Quebec, Canada. sebastien.grenier2@usherbrooke.ca
authors.forename: Sébastien
authors.initials: S
authors.lastname: Grenier
authors.forename: Kieron
authors.initials: K
authors.lastname: O'Connor
authors.forename: Claude
authors.initials: C
authors.lastname: Bélanger
mesh_terms: D000328:Adult; D015928:Cognitive Behavioral Therapy / Q000379:methods* / Q000706:statistics & numerical data; D003192:Compulsive Behavior / Q000628:therapy; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D009770:Obsessive Behavior / Q000628:therapy; D009771:Obsessive-Compulsive Disorder / Q000628:therapy*; D012650:Self Disclosure; D012720:Severity of Illness Index; D011795:Surveys and Questionnaires; D016896:Treatment Outcome; D055815:Young Adult