Humans had always regarded the ability to laugh and appreciate humour as one that set them apart from other species. But investigations into the causes of laughter have led researchers to question this exclusivity, as the ape equivalent of human laughter, and even the version that rats enjoy, are emerging. Now neurologists have traced people's instinct to laugh to a highly evolved part of the brain that controls language, and the study of the role of everyday laughter, particularly in child development and relaxation, is leading to a controversial theory about the treatment of hyperactivity
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