Trait Versus Task-Induced Emotional Reactivity and Distress Intolerance in Hoarding Disorder: Transdiagnostic Implications Melissa M. Norberg ⁎ Alissa P. Beath Macquarie University Centre for Emotional Health, Macquarie University Fiona J. Kerin Chantelle Martyn Peter Baldwin Jessica R. Grisham UNSW Sydney Evidence from analogue samples suggests that deficits in emotional functioning, namely elevated emotional reactivity and distress intolerance, are implicated in the development and maintenance of hoarding disorder. We aimed to extend previous research in this area by investigating emotional reactivity and distress intolerance in a sample of individuals diagnosed with hoarding disorder (n = 24) in comparison to clinical controls (n = 21) and nonclinical community controls (n = 26) using a combination of self-report, physiological, and behavioral measures. We found that trait distress intolerance was significantly and independently associated with greater hoarding severity. The hoarding and clinical control groups reported more trait emotional reactivity and distress intolerance than the community control group, but did not differ from each other on these traits. The hoarding group reported more subjective distress before beginning a frustrating behavioral task, but did not evidence more physiological arousal. Moreover, the hoard- ing group experienced similar increases in distress during the task and did not differ from either group in regard to time persisting on this task. The clinical control group, however, terminated the frustrating task significantly faster than the community control group, who tended to persist until the task timed out. Lastly, trait distress intolerance evidenced a small-to-moderate but nonstatistically significant indepen- dent relationship with task persistence time. Given the desynchrony between subjective distress and physiological arousal, we encourage researchers to utilize multimodal assessment in the future. We also suggest that clinicians start to use behavioral experiments, as has been done with other psychological disorders, to improve distress intolerance among persons who experience hoarding disorder. Keywords: hoarding; obsessive and compulsive related disorders; distress tolerance; emotional reactivity; emotion regulation HOARDING DISORDER (HD) IS characterized by persistent difficulty discarding possessions due to being emotionally attached to possessions and wanting to avoid the distress associated with throwing possessions away (American Psychiatric Association, 2013). Although several studies using nonclinical and clinical samples have shown that greater self-reported trait negative emotionality and distress intolerance are related to more severe hoarding (Cougle, Timpano, Fitch, & Hawkins, 2011; Fernandez de la Cruz et al., 2013; Grisham et al., 2018; Hezel & Hooley, 2014; Mathes et al., Available online at www.sciencedirect.com ScienceDirect Behavior Therapy xx (xxxx) xxx www.elsevier.com/locate/bt ⁎ Address correspondence to Melissa M. Norberg, Centre for Emotional Health, Department of Psychology, L54 First Walk, Room 714, Macquarie University; Sydney, New South Wales, Australia 2109; e-mail: melissa.norberg@mq.edu.au. 0005-7894/© 2019 Association for Behavioral and Cognitive Therapies. Published by Elsevier Ltd. All rights reserved. BETH-00903; No of Pages 12; 4C: Please cite this article as: M. M. Norberg, A. P. Beath, P. Baldwin, et al., Trait Versus Task-Induced Emotional Reactivity and Distress Intolerance in Hoarding Disorder: Transdiagnostic ..., Behavior Therapy, https://doi.org/10.1016/j.beth.2019.05.010