Previous research has shown that rats can learn matching-to-sample relations with olfactory stimuli; however, the specific characteristics of this relational control are unclear. In Experiment 1, 6 rats were trained to either match or nonmatch to sample in a modified operant chamber using common household spices as olfactory stimuli. After…

In a previous issue of "The Behavior Analyst," the authors discussed the ambiguities that surround the distinction between positive and negative reinforcement. Seven distinguished behavior analysts commented on their article. The authors believe that this dialogue represented a constructive step toward clarification of an important concept within…