If a dog that has been classically conditioned to salivate when shown a square also salivates when shown a rectangle, what does the dog's behaviour illustrate?

Question

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The dog's behavior illustrates stimulus generalization, which occurs when an organism responds to stimuli that are similar but not identical to the conditioned stimulus. In this case, the rectangle is similar enough to the square that it elicits the conditioned response of salivation.

If a Dog That Has Been Classically Conditioned to Salivate