Abstract
Conditions necessary for the development of social interaction were examined with 7 Observer pigeons, each working beside a Model pigeon. Observer was conditioned to pay attention to the Model's behavior. Model's key pecking rate on a multiple fixed-ratio, extinction schedule was controlled by stimuli projected on his key (not visible to Observer), but Observer, whose key always remained the same color, had no discriminative stimuli except those provided by Model's behavior. More precise control of Observer's behavior occurred when Model could be both seen and heard than when Model could be heard only.

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