| pubmed-article:1747977 | pubmed:abstractText | 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. | lld:pubmed |
