“…Due to the serious health and social problems associated with rumination, interventions that produce rapid results are especially important. A variety of interventions have been used to reduce rumination, including the contingent presentation of aversive stimuli (e.g., Linscheid & Cunningham, 1977; Sajwaj et al, 1974), noncontingent food delivery (e.g., Lyons, Rue, Luiselli, & DiGennaro, 2007; Rast et al, 1981), differential reinforcement of other behavior (DRO; e.g., Conrin, Pennypacker, Johnston, & Rast, 1982), and contingent exercise (e.g., Daniel, 1982). All of these interventions have been found to reduce rumination relative to baseline levels.…”