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Whenever Annie goes to the board to do math problems, the other students giggle and make comments to eachother. Annie assumes the giggling is directed at her and now refuses to do math problems at the board. Pavlov would say that embarrassment for most people is THIS, and in this example, doing math problems at the board is THIS for Annie and embarrassment in response to doing math problems is THIS.
What is unconditioned response, a conditioned stimulus and a conditioned response.