What can be done to “extinguish” classically conditioned fear responses? Which method seems to work best?

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What can be done to “extinguish” classically conditioned fear responses? Which method seems to work best? Why is it that classically conditioned fear responses are unlikely to be extinguished without some sort of intervention?
Read the full text of at least one peer reviewed/refereed journal article published within the past few years on the discussion question topics. Include at least one article in both of your discussion responses.

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