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induce and stimulate smiles. please, dont try this at home. 英語(yǔ)演講稿3 in a related german study, researchers used fmri imaging to measure brain activity before and after injecting botox to suppress smiling muscles. the finding supported darwins theory by showing that facial feedback modifies the neural processing of emotional content in the brain in a way that helps us feel better when we smile. smiling stimulates our brain reward mechanism in a way that even chocolate a wellregarded pleasure inducer cannot researchers found that one smile can generate the same level of brain stimulation as up to 2,000 bars of chocolate. (laughter) wait. the same study found that smiling is as stimulating as receiving up to 16,000 pounds sterling in cash. thats like 25 grand a smile. its not bad. and think about it this way: 25,000 times 400 quite a few kids out