title: Psychotic reactivity to daily life stress and the dopamine system: a study combining experience sampling and [18F]fallypride positron emission tomography.
abstract: Stressful life events increase the risk for psychosis, and the subjective experience of stress related to daily life activities drives moment-to-moment variation in psychotic intensity. Positron emission tomography (PET) studies suggest that dopaminergic (DAergic) activity mediates the behavioral response to an experimental stressor. However, it is not known how alterations in this DAergic stress response relate to the subjective experience of stress in real life situations assessed in momentary assessment studies. This study combined [18F]fallypride PET with an Experience Sampling ambulatory assessment approach to examine the association between the prefrontal DAergic response to experimentally induced stress and real life psychotic reactivity to the subjective experience of stress in daily life. Healthy first-degree relatives of individuals with a psychotic disorder (N = 14) and healthy controls (N = 11) participated in (a) a psychosocial [18F]fallypride PET stress paradigm and (b) an experience sampling study, using a structured diary approach. Mixed multilevel random intercept models revealed that stress-induced [18F]fallypride displacement, indicative of DAergic activity, in ventromedial prefrontal cortex (VMPFC) was associated with psychotic reactivity to daily life stress in the entire sample. Lower levels of [18F]fallypride displacement to stress predicted increased psychotic reactivity to daily life stress. This study combined PET neuroimaging with real life behavioral assessments in the investigation of psychotic symptoms; we showed decreased [18F]fallypride displacement to stress in VMPFC to be associated with increased psychotic reactivity to daily life stress. The preliminary evidence in this study demonstrates that it is possible to acquire a grasp on how brain function is associated with contextualized experience, which has relevance for neuroimaging studies in general.
authors: Department of Psychiatry and Psychology.
authors: Dennis
authors: D
authors: Hernaus
authors: Department of Psychiatry and Psychology.
authors: Dina
authors: D
authors: Collip
authors: Faculty of Psychology and Educational Sciences, Open University Heerlen.
authors: Johan
authors: J
authors: Lataster
authors: Department of Psychiatry and Psychology.
authors: Wolfgang
authors: W
authors: Viechtbauer
authors: Centre for Philosophical Psychology, University of Antwerp.
authors: Erik
authors: E
authors: Myin
authors: Division of Nuclear Medicine, University Hospital Louvain.
authors: Jenny
authors: J
authors: Ceccarini
authors: Division of Nuclear Medicine, University Hospital Louvain.
authors: Koen
authors: K
authors: Van Laere
authors: Department of Psychiatry and Psychology.
authors: Jim
authors: J
authors: van Os
authors: Department of Psychiatry and Psychology.
authors: Inez
authors: I
authors: Myin-Germeys
mesh_terms: D000203:Activities of Daily Living / Q000523:psychology; D000293:Adolescent; D000328:Adult; D000368:Aged; D001549:Benzamides; D016022:Case-Control Studies; D005190:Family; D005260:Female; D005462:Fluorine Radioisotopes; D006801:Humans; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D049268:Positron-Emission Tomography; D017397:Prefrontal Cortex / Q000000981:diagnostic imaging*; D011618:Psychotic Disorders / Q000473:pathology / Q000523:psychology*; D011759:Pyrrolidines; D013315:Stress, Psychological; D055815:Young Adult
chemical_list: D001549:Benzamides; D005462:Fluorine Radioisotopes; C094948:N-((1-allyl-2-pyrrolidinyl)methyl)-5-(3-fluoropropyl)-2,3-dimethoxybenzamide; D011759:Pyrrolidines