“…This approach is not without its critics, however, even within behavior analysis (e.g., Staddon, 1993). Some theories of operant extinction include such hypothetical constructs as competing responses (e.g., Adelman & Maatsch, 1955) and inhibition (Hearst et al, 1970). Nonetheless, this generally functional approach has advanced both the understanding of extinction and the use of extinction in a host of applications.…”