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During this time there was considerable progress in understanding simple associations; notably, around 1930 the differences between Thorndike's instrumental (or operant) conditioning and Pavlov's classical (or Pavlovian) conditioning were clarified, first by Miller and Kanorski, and then by B. F. Skinner . [17] [18] Many experiments on conditioning followed; they generated some complex theories, [19] but they made little or no reference to intervening mental processes.