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    https://en.wikipedia.org › wiki › Laughter

    Laughter - Wikipedia

    • Laughter is a pleasant physical reaction and emotion consisting usually of rhythmical, usually audible contractions of the diaphragm and other parts of the respiratory system. It is a response to certain external or internal stimuli. Laughter can rise from such activities as being tickled, or from humorous stories, imagery, videos or thoughts. Most commonly, it i… See more

    Nature

    Laughter might be thought of as an audible expression or appearance of excitement, an inward … See more

    Brain

    Neurophysiology indicates that laughter is linked with the activation of the ventromedial prefrontal cortex, that produces endorphins. Scientists have shown that parts of the limbic system are involved in laughter. This system is i… See more

    Health

    A link between laughter and healthy function of blood vessels was first reported in 2005 by researchers at the University of Maryland Medical Center with the fact that laughter causes the dilatation of the inner lining of blo… See more

    Laughter - Psychology Today
    Psychology Today
    Communication

    A number of studies using methods of conversation analysis and discourse analysis have documented the systematic workings of laughter in a variety of interactions, from casual conversations to interviews, … See more

    Causes

    Common causes for laughter are sensations of joy and humor; however, other situations may cause laughter as well.
    A general theory that explains laughter is called the relief theory. Sigmund Freud summarize… See more

    Structure and anatomy

    A normal laugh has the structure of "ha-ha-ha" or "ho-ho-ho". It is unnatural, and one is physically unable, to have a laugh structure of "ha-ho-ha-ho". The usual variations of a laugh most often occur in the first or final note in a se… See more

    Negative aspects

    Laughter is not always a pleasant experience and is associated with several negative phenomena. Excessive laughter can lead to cataplexy, and unpleasant laughter spells, excessive elation, and fits of laughter … See more

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