The classic case of Stimulus Generalization is Little Albert. The About.com link also explains it in terms of dogs. I note that in both cases, it seems highly likely that the subject (dog or infant) is unable to discriminate stimuli or unable to determine which part of the stimulus is relevant.
Have there been studies on stimulus generalization in adults?
Specifically, I wonder if stimulus generalization results from the inability to determine what part of an unconditioned stimulus (white rat) is associated with the conditioned stimulus (loud noise).
I know that discrimination can be caused by conditioning with relevant stimuli and extincting non-relevant stimuli, but would an adult human generalize fear to a general stimulus or a specific one and why?