“…In fact, applied research findings suggest that a variety of desirable and undesirable side effects can occur within and across individuals. Punishment of problem behavior has been associated with increases in appropriate behavior, such as compliance and toy play (e.g., Koegel, Firestone, Kramme, & Dunlap, 1974; and with decreases in unpunished inappropriate behavior, including aggression and crying (e.g., Bitgood, Crowe, Suarez, & Peters, 1980;Lovaas & Simmons, 1969;Ricketts et al, 1993;Singh, Watson, & Winton, 1986). On the other hand, decreases in appropriate behavior (e.g., toy play, speaking) and increases in unpunished problem behavior (e.g., aggression, emotional reactions, stereotypic behavior) also have been reported (e.g., Bitgood et al, 1980;Duker & Seys, 1996;Foxx & Azrin, 1973;Harris & Wolchick, 1979;Pendergrass, 1971;Singh, Manning, & Angell, 1982;Thompson et al, 1999).…”