“…Studies have shown that positive social reinforcement in the form of attention, and negative reinforcement, in the form of escape from aversive situations, may also serve as maintaining consequences for repetitive behaviors (e.g., Durand & Carr, 1987). Studies of verbal problem behavior (e.g., bizarre vocalizations, echolalia, perseverative speech) have identified positive social reinforcement (i.e., attention; e.g., Rehfeldt & Chambers, 2003), negative reinforcement (i.e., escape from demands; e.g., Pace, Iwata, Cowdrey, Andree, & McIntyre, 1993), access to tangible items (e.g., Ewing, Magee, & Ellis, 2002); and nonsocial functions (i.e., automatic reinforcement; e.g., Ahearn, Clark, MacDonald, & Chung, 2007) as maintaining them. Studies have also shown that repetitive behavior displayed by individuals with autism can be used to reinforce alternative low-rate behaviors (Charlop, Kurtz, & Casey, 1990;Hung, 1978;Sugai &White, 1986;Wolery, Kirk, & Gast, 1985) suggesting that such behavior can be potent reinforcers.…”