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Sometimes a genuine extension seems to occur when no similarity between stimuli expressible in the terms of physical science can be demonstrated. There are several possible explanations. Two stimuli may have a common effect upon the responding organism, which mediates the extension of the response. In the example Juliet is the sun, it is possible that a physical similarity could not be plausibly established. Only to Romeo did Juliet glow with the light of dawn. (p. 97)