Abstract
In two experiments, pigeons were given unsignaled food presentations (Group Unsignaled), tone-food pairings (Group Signaled), or no treatment (Group Control). All groups were subsequently given pairings of a white keylight with food. Although no group differences in autoshaping to white appeared, when birds were subsequently given autoshaping with a different colored light using partial reinforcement, either in a different set of chambers (Experiment 1) or in the same set of chambers (Experiment 2), an effect of prior treatment did appear. Birds in Group Unsignaled responded at a lower rate than those in Groups Signaled and Control, which did not differ.
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