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shaping primary reinforcers reinforcer reinforcement skinner box thorndike’s law of effect edward l.thorndike spontaneous recovery extinction habituation unconditioned response unconditioned stimulus neutral stimulus dog experiment ivan pavlov theories in learning cognitive theory bf skinner operant conditioning classical conditioning robbers cave experiment resentment zero sum outcome eagles 1953 spirit of competence rgct realistic conflict theory intergroup conflict scare resouces carolyn wood sherif muzafer sherif source of prejudice limited resources resources competencias competition ethics moral human behaviour values identity society traditions attitudes ideas education psychology social psychology behaviour social media social behavior culture impact