Laughing

Laughing is a physical reaction in humans consisting usually of rhythmical, often audible contractions of the diaphragm and other parts of the respiratory system. It is a response to certain external or internal stimuli. Laughter can arise from such activities as being tickled, or from humorous stories or thoughts. Most commonly, it is considered a visual expression of a number of positive emotional states, such as joy, mirth, happiness, relief, etc. On some occasions, however, it may be caused by contrary emotional states such as embarrassment, apology, or confusion such as nervous laughter or courtesy laugh. Age, gender, education, language, and culture are all factors as to whether a person will experience laughter in a given situation.

Physiology

Laughter is a part of human behavior regulated by the brain, helping humans clarify their intentions in social interaction and providing an emotional context to conversations. Laughter is used as a signal for being part of a group—it signals acceptance and positive interactions with others. Laughter is sometimes seen as contagious, and the laughter of one person can itself provoke laughter from others as a positive feedback.

Social aspects

Laughter is a common response to tickling. In Tickle torture, laughter can become painful, but unlike pain from a normal injury, tickle-induced pain is often perceived as pleasurable. This is due to the expectation of fun and enjoyment that is associated with tickling.

Laughter and health

Laughter has been shown to have beneficial effects on various aspects of biochemistry. It has been shown to lead to reductions in stress hormones such as cortisol and epinephrine. When laughing the brain also releases endorphins that can relieve some physical pain. Laughter also boosts the number of antibody-producing cells and enhances the effectiveness of T-cells, leading to a stronger immune system.

See also

• Humor
• Comedy
• Laughter in animals
• Laughter therapy
• Laughter and the brain

References

Laughing Resources
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