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springely said:
Laughing is a reaction to certain stimuli, fundamentally stress, which serves as an emotional balancing mechanism. Traditionally, it is considered a visual expression of happiness, 또는 an inward feeling of joy. It may ensue from hearing a joke, being tickled, 또는 other stimuli. It is in most cases a very pleasant sensation.
Recent investigations 의해 Robert Provine suggest that laughter is a form of communication, probably the first one in the human race, which later evolved, with the liberation of voice from walking and breathing, into human language.[1]
Laughter is found among various animals, as well as in humans, although it is 더 많이 rare in most mammals and 동물 overall. Among the human species, it is a part of human behavior regulated 의해 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.[2] This may account in part for the popularity of laugh tracks in situation comedy 텔레비전 shows. Laughter is anatomically caused 의해 the epiglottis constricting the larynx. The study of humor and laughter, and its psychological and physiological effects on the human body, is called gelotology.
Children are known to laugh a lot 더 많이 than adults. An average baby laughs 300 times a 일 compare to an average adult who laughs 20 times a day. According to some studies as people grow up they started to get 더 많이 serious and slowly losing ability to laugh a lot when they were the kids.[3] Laughter is an audible expression 또는 appearance of excitement, an inward feeling of joy. It may ensue from jokes, tickling, and other stimuli. Researchers have shown infants as early as 17 days old have vocal laughing sounds 또는 laughter.[4] It conflicts with earlier studies indicating that infants usually start to laugh at about four months of age. Laughter researcher Robert Provine said: "Laughter is a mechanism everyone has; laughter is part of universal human vocabulary. There are thousands of languages, hundreds of thousands of dialects, but everyone speaks laughter in pretty much the same way.” 아기 have the ability to laugh before they ever speak. Children who are born blind and deaf still retain the ability to laugh.
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