Known as the father of behaviorism. Watson argued that what counts in psychology is observable behavior and coined the term "behaviorism". Watson based his theory on the Stimulus-Response (SR) model. Watson’s principle was “The rule, or measuring rod, which the behaviorist puts in front of him always is: Can I describe this bit of behavior I see in terms of ‘stimulus and response’?” Watson described psychology as a natural science, one needing no assumptions about consciousness or mental events to explain the succession of stimuli and response that are the proper object of its study. He did not deny that physiology limits behavior, as well as properties of our physical surroundings. Even though he recognized these limitations he still maintained that the major source of “behavioral variety” as the influences that we experience after birth (Rychlak , 1981).

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