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DOI: 10.1177/000992289103001103 Normal and Pathologic Laughter in ChildrenMount Sinai Hospital (Toronto), University of Toronto, 1001 Bay Street, Apt. 1418, Toronto, Ontario, M5S 3A6, Canada Laughter is a partly involuntary act involving complex pathways in the central nervous system. Laughter normally has positive effects on emotions; however, pathologic laughter is not related to emotion and occurs independent of a stimulus in the environment. This paper outlines normal laughter and the etiology of pathologic laughter, considering both congenital and acquired causes.
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