The radical behaviorism is defined as "the philosophy of science of behavior treated as a subject matter in its own right apart from internal explanations, mental or physiological" (Skinner, 19989, p. 122). The purpose of this paper is to summarize core ideas of the radical behaviorism in comparison with the methodological behaviorism. The methodological behaviorism excludes private events from psychological data, while it accepts the operational definition of hypothetical constructs which are described by, and sometimes refer to, the mental terms, concepts, and processes. In contrast, the radical behaviorism locates the private events in the inner world within the skin (not mental but physical dimension) and apply the contingency analysis to those events as it is for the the public events. In consequence, the radical behaviorism views the mental terms, concepts, and processes as a discrimination learning of private events and a covert verbal behavior. Because these behaviors are acquired and maintained through the contingencies of reinforcement provided by the verbal community, those terms, concepts, and processes can be viewed as a social product. Pragmatic philosophy underlies these views : The science is the behavior of the scientists, so the purpose of psychology should be the prediction and control of behavior becauseit is most reinforcing for the scientists' science behavior.
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