“…Studies have shown that some individuals are unresponsive to the reinforcing effects of praise or other social stimuli (Drennen, Gallman, & Sausser, 1969; Ebner, 1965; Kale, Kaye, Whelan, & Hopkins, 1968; Levin & Simmons, 1962; Lovaas et al, 1966; Stahl, Thomson, Leitenberg, & Hasazi, 1974) or may even find social interaction to be aversive (Hagopian, Wilson, & Wilder, 2001; Levin, 1962; Taylor & Carr, 1992). These problems present a special challenge to teachers and clinicians, who may address the issue in one of two ways when attempting to teach appropriate behavior.…”