Three pigeons were trained in a situation where they responded on a FR schedule in the presence of a yellow light. Following the completion of each FR the key was darkened for either 30 sec. or 2 min. (S— period). A peck to the dark key produced one of two colors; green if the 30-sec. S— period was in effect; blue if the 2-min. S— period was in effect. The birds responded to produce these stimuli but showed a rate decrease when the two colors were no longer correlated with the duration of S —. One of the 3 subjects had probably formed a superstitious chain during training and the results from this subject were equivocal.
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