laughter

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The activity of laughing; the manifestation of mirth or joy, or, less commonly, sarcasm or scorn
Alternative medicine See Laughter club, Laughter therapy, Laughter yoga
Neurology Spasmodic and largely involuntary expirations often accompanied by inarticulate vocalisations, generally evoked by mirth
Physiology Laughter increases blood flow to the brain and activates neural networks—e.g., nucleus accumbens (NAcc) and amygdala. Functional MRI data suggests that the increase in blood flow to NAcc evoked by extreme humour is similar to that triggered by monetary gain or use of some addictive drugs; a key symptom of depression is the lack of a sense of reward from previously rewarding activities—e.g., humour
Psychiatry Laughter is regarded as the most effective coping skill for anxiety-panic disorders and may temporarily alleviate the symptoms of anxiety and depression

laughter

(laf′tĕr)
A series of inarticulate sounds produced as an expression of emotion, usually happiness or mirth. The role of humor and laughter in promoting a positive attitude and health and in preventing the progress of some diseases has been documented esp. when it is combined with proven medical therapies.

compulsive laughter

Laughter without cause, occurring in certain psychoses, esp. schizophrenia.

pathological laughter

Uncontrolled laughter (occasionally accompanied by, or alternating with, uncontrolled crying), caused by pseudobulbar lesions of the brain. These lesions may result from lacunar strokes, multiple sclerosis, anoxic brain injury, and other forms of brain injury.
References in periodicals archive ?
Working-class cities with a strong sense of their own identity tend to produce the best comics,and Liverpool is certainly no exception -as visitors to Chortle.
Madison Avenue would laugh - might even guffaw, surely would chortle - at the wording of this dish.
IF you need a laugh in 2015 then at the moment chortles may be in short supply.
After awhile, Cahill's drolleries evoke few chortles, and his preoccupation with biblical sexcapades arouses suspicion.
When he drives off in what is touted as Hitler's car, he chortles, ``It's Fuehrer-ific
I ask him why he is called by his middle name Marcus instead of William or Bill and he chortles.
LOVING the understated chortles of Man Stroke Woman (BBC2, Monday).
It all starts to fall apart when Mr Chortles is hired to entertain the kids at his son's sixth birthday party on the very day a journalist comes to interview Charlie about his charmed life.
Michael Parkinson chortles at another Peter Kay joke .
Shaadi Se Pehle: An uncomplicated love story, big on hearty chortles and laughs but low on a strong clever script.
IT'S CHORTLES all round in this timeless classic by Oscar Wilde.
Suddenly, ``You've got one year, Ben,'' he chortles.