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The experiment has three phases: two training phases and a test phase. In the first training phase, there is only one predictive stimulus (CS), either a noise or a light (depending on which group Each occurrence of the CS terminates in a reinforcement (dot = shock in someversions of the experiment, food in other versions). In the second training phase, a second CS (either the light or the noise) is presented together with the first CS (�in compound�) The compound CSs also terminate in reinforcement (dots). In the testing phase, each CS is presented in isolation and the amount of conditioned (learned) responding is measured