“…An earlier laboratory study applied this model to perseverative cognition (i.e., worry and rumination) in healthy individuals, hypothesizing a link between cognitive inflexibility and autonomic rigidity expressed as reduced HRV (Ottaviani, Shapiro, & Couyoumdjian, 2013). The rationale for collapsing worrisome and ruminative thoughts into a single phenomenal category is corroborated by studies showing no differences between these two processes on their impact on appraisals and strategies (e.g., Segerstrom, Tsao, Alden, & Craske, 2000;Watkins, Moulds, & Mackintosh, 2005) and by the incremental benefits of using perseverative cognition as a transdiagnostic symptom (McEvoy, Watson, Watkins, & Nathan, 2013;Spinhoven, Drost, van Hemert, & Penninx, 2015).…”