200 chicks were exposed to 1 of 5 experimental conditions of differing frequencies of light onset for 30 min. prior to a subsequent 30-min. period in which light onset was contingent upon the behavior of the experimental bird. The exposure to light onset had a significant differential effect upon elicited responses as well as light-reinforced responses during the second phase. The general results were discussed in terms of the activating and reinforcing function of the sensory stimulus.
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