FAILURE OF INHIBITION BY B OVER C AFTER A-, ABC+ TRAINING(, AB)

In 3 autoshaping experiments, pigeons were trained with an A+, AB-, AB C+ task in which Stimulus A signaled food, Stimulus Compound AB signal ed no food, and Stimulus Compound ABC signaled food. Contrary to the p rediction from elemental theories of conditioning, responding on a Sti mulus Compound BC trial was not less than responding on a Stimulus C t rial in testing. However, Stimulus B attenuated responding to another exciter (Experiment 2), and a separately trained inhibitor could atten uate responding to Stimulus C (Experiment 3). These results were consi stent with a configural theory.