John B.Watson and Rosalie Rayner (1925)found that Little Albert's conditioned fear was elicited not only by a rat but also by a number of similar objects.Little Albert's behavior illustrates stimulus:

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Little Albert's conditioned fear was not limited to the original stimulus (the rat) but also generalized to similar objects, which is an example of stimulus generalization. Discrimination refers to the ability to differentiate between similar stimuli, adaptation refers to an organism's ability to adjust to its environment, and extinction refers to the weakening of a conditioned response over time.

John BWatson and Rosalie Rayner (1925)found That Little Albert's Conditioned Fear