Resurgence of previously reinforced behavior represents a challenge to otherwise successful interventions based on differential reinforcement of alternative behavior (DRA). Expanded-operant treatments seek to increase the number of functional alternative behaviors through DRA, thereby potentially mitigating resurgence. However, the few studies that have directly examined these methods as a tool for resurgence mitigation have provided limited and unclear results. Thus, the present experiments were designed to investigate the effect of expanded-operant DRA methods on resurgence of previously reinforced behavior using rat subjects. In two experiments, following a baseline phase in which a target response was trained, groups of rats experienced concurrent (i.e., five simultaneous alternative responses), serial (i.e., five sequentially available alternative responses), or single DRA interventions arranging similar rates of alternative reinforcement in order to examine potential differences in resurgence. Both experiments showed that neither serial nor concurrent DRA expanded-operant treatments reduced resurgence compared with single DRA regardless of whether stimuli associated with previously reinforced alternative responses were removed (Experiment 1) or remained present (Experiment 2) for the serial-DRA group. Further, a primacy effect in resurgence was obtained for the serial-DRA group in both experiments. Overall, these results suggest that expanded-operant treatments may not help to reduce resurgence.
