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What biological changes does laughter produce?

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Facts: * The number of facial muscles affected during a laugh is about 15. * The larynx becomes half-closed so that we breathe irregularly, which can makes us gasp for air. * Sometimes, the tear ducts become activated. read more

Laughter increases the amount of T cells, which attack viruses, foreign cells and cancer cells, and gamma interferon, a protein that fights diseases. It increases B-cells, which make disease-destroying antibodies Immunoglobulin A, an antibody that fights upper respiratory tract infections, and immunoglobulins G and M, which help fight other infections, levels all rise due to laughing. read more

Dr. Dunbar thinks laughter may have been favored by evolution because it helped bring human groups together, the way other activities like dancing and singing do. Those activities also produce endorphins, he said, and physical activity is important in them as well. read more

The Laughing Brain 1: How We Laugh has a twofold focus. First, it focuses on the science of laughter in terms of how the brain reacts to an external stimulus that is funny. Second, it explores the positive effects of laughter in terms of our social, mental, and physical well-being. The Laughing Brain 2: A Good Laugh focuses on three concepts. read more

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