This article reviews evidence from basic and translational research with pigeons and humans suggesting that the persistence of operant behavior depends on the contingency between stimuli and reinforcers, and considers some implications for clinical interventions. (Contains 4 figures.)

The author of this article presents his own explanation on the two types of conditioning--respondent and operant. He states that when withdrawal of a negative reinforcer is the contingency that increases the strength of the operant behavior, the stimulus will have a negative emotional response to the experimental chamber. However, when a positive…

Experimental studies are reviewed in which stuttering and speech disfluency were subjected to response contingent stimuli (RCS). Research issues are discussed, including response-stimulus contiguity, subject awareness, behavior definitions, stimulus control of responses, subject variability, effects of RCS on nonstuttered speech parameters,…

Michael (1975) reviewed efforts to classify reinforcing events in terms of whether stimuli are added (positive reinforcement) or removed (negative reinforcement). He concluded that distinctions in these terms are confusing and ambiguous. Of necessity, adding a stimulus requires its previous absence and removing a stimulus its previous presence.…