John Watson and Rosalie Rayner created a phobia in a 9-month old boy called 'little Albert'. He showed no unusual anxiety at the start of the study, and when shown a rat, tried to play with it. However, when the rat was presented, a loud noise was made from banging an iron bar close to his ear. This noise is an unconditioned stimulus, which brings about the unconditioned response of fear. The rat (neutral stimulus) became associated with the noise, inducing fear, which is a conditioned response. This conditioned fear applied to similar objects, such as a rabbit, a fur coat and a a santa claus.