“…First, theoretical and empirical literature suggest that individuals may experience dysregulation across both positive and negative emotional systems (e.g., Linehan, 1993; Linehan, Bohus, & Lynch, 2007; Segal, Williams, & Teasdale, 2002). For example, patients with borderline personality disorder and major depressive disorder have been found to display nonacceptance of both negative and positive mood states (e.g., Beblo et al, 2012; Kissen, 1986), judging both to be undesirable, unpredictable, and/or frightening. Similarly, evidence suggests that individuals with posttraumatic stress or panic disorders may seek to avoid any form of arousal, including the physiological arousal associated with some positive emotional states (see Roemer, Litz, Orsillo, & Wagner, 2001; Tull, 2006).…”