Stimulus conditions involved in a discriminative operant leaming situation were manipulated to determine which cues were being responded to in order to solve the problem. In a situation where the SD and Sil. periods were of equal length and where a bar press resulted in a click of the feeder mechanism only during the SD period it was found that time interval and/or whether or not a bar press resulted in a pellet of food were utilized by S more so than the cue light or the click of the feeder mechanism.
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