Inhibition and facilitation by B over C after A+, AB-, and ABC+ training with multimodality stimulus combinations

Previous research with keylight conditioned stimuli has revealed that pigeo ns failed to show inhibition by Stimulus B over Stimulus C in BC versus C t esting after A+, AB-, ABC+ training where Stimulus A and Stimulus Compound ABC had signaled food, and Stimulus Compound AB had signaled no food. Indee d, B slightly facilitated responding to C on the BC trials. The present res earch addressed the same issue with multimodality stimulus arrangements in autoshaping with pigeons, conditioned suppression with rats, and instrument al discrimination learning with rats. Stimulus B facilitated responding to C if A and B were of the same modality and C was of a different modality. H owever, B inhibited responding to C if A and C were of the same modality an d B was of a different modality, or if B and C were of the same modality an d A was of a different modality. These results are correctly predictable by Pearce's configural model with a minor modification.