[U5Q] James is teaching his client how to use the toilet. He…
James is teaching his client how to use the toilet. He collects baseline data and determines that the potential for accidents is high. He then implements an intervention that requires the client to wear underwear instead of the diaper the client currently wears, and the frequency of accidents decreases. Once the client consistently uses the toilet properly and accidents are rare, James implements a differential reinforcement for alternative behavior (DRA) procedure. The frequency of accidents initially remains low but begins to increase (trend back up) after a few sessions of DRA. Which confound is most likely to influence these results?