“A rule is simply an object in the environment. Why should it be important? This is the sort of question which always plagues the dualist. Descartes could not explain how a thought could move the pineal gland and thus affect the material body . . . How does a rule govern behavior? As a discriminative stimulus, a rule is effective as part of a set of contingencies of reinforcement. A complete specification must include the reinforcement which has shaped the topography of a response and brought it under the control of the stimulus.” (p. 148)
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