I. P. Pavlov's scientific contributions


... A classic example is represented by Pavlov's experiments with dogs. 55 These dogs salivated (unconditioned response) in the presence of food (unconditioned stimulus, US) and were trained to associate the presence of food to the sound of a bell (CS), so that eventually they salivated at the sound of the bell, even without food. In the most basic version of CPP assays, the rodent is placed in an apparatus constituted by two distinct chambers (e.g., with different textures and shading patterns, to provide different contextual stimuli). ...
Reference: Addictions