Classical conditioning is the process that involves creating an association between a naturally existing stimulus and a previously neutral one. The most well known explanation of classical conditioning is through the experiment with Ivan Pavlov’s dogs. In this experiment an unconditioned stimulus (food) is paired with a previously neutral stimulus (whistle). During conditioning the food and whistle are used together and after conditioning the whistle becomes the conditioned stimulus. This means that when the dog hears the whistle they will be conditioned to start salivating because during conditioning the whistle and food were paired together.