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Ivan Pavlov

developed Classical Conditioning and received the Nobel Prize for his work

Konrad Lorenz

studied imprinting (a fixed action pattern of ducks to identify with the first organism seen)

Mary Cover Jones

developed counterconditioning to unlearn a classically conditioned response

E.L. Thorndike

developed Instrumental Conditioning and termed the "law of effect" which states that a behavior followed by a positive consequence will be strengthened

B.F. Skinner

developed Operant Conditioning and clarified the types of reinforcement and punishment


discovered that taste aversion occurs in only one trial and termed biological preparedness to explain this


discovered that in order for Classical Conditioning to occur, the CS must reliably predict the UCS

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