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Two possible versions of Pavlovian conditioning. In Pavlovian conditioning, neural connection or association may develop from the CS center to the US center or from the CS center directly to the response center. The former matches S-S association theory and the latter matches S-R association theory (Mazur, 2017). Pavlov’s stimulus substitution theory (Pavlov, 1927) can be considered as a form of the S-S learning theory.
