Understanding laughter

Robin Dunbar, the Oxford evolutionary psychologist who famously suggested the outer limits of meaningful human relationships, now suggests that the inherent pleasure of laughter lies not in "the intellectual pleasure of cerebral humor, but the physical act of laughing."

In five sets of studies in the laboratory and one field study at comedy performances, Dr. Dunbar and colleagues tested resistance to pain both before and after bouts of social laughter. The pain came from a freezing wine sleeve slipped over a forearm, an ever tightening blood pressure cuff or an excruciating ski exercise. The findings, published in the Proceedings of the Royal Society B: Biological Sciences, eliminated the possibility that the pain resistance measured was the result of a general sense of well being rather than actual laughter. And, Dr. Dunbar said, they also provided a partial answer to the ageless conundrum of whether we laugh because we feel giddy or feel giddy because we laugh.