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 ?
Risible Rhymes beginswith mock country verse — including, as you note, some of the same mock verse as in the much different Brains Confounded .
I realise you have to pander to the Labour majority in the North East but such drivel is risible.
Another thing with the Scottish referendum campaign - from the bits I've watched, other than Alex Salmond, those I've seen making the case for independence have been Pat Kane of risible 80s pop band Hue & Cry and then, on the special Scottish Question Time, it was Rick Ross, lead singer of risible 80s pop band Deacon Blue.
Despite a slight, breezy USA network-type feel, "Taxi Brooklyn" is such a risible concept as to border on parody.
The groundswell did not reach enough councillors before they voted in favour of their own risible rooftop erection.
Sunday's broadcast from Leeds was the best I've seen, a far cry from the days when sportsmen were asked to partake in impromptu rowing contests or obliged to join in with risible 'fun' activities that were no less undignified than passing an orange down the line without using your hands.
Brian May - Badgerloving Brian May this week had a pop at BBC talent show The Voice, but anyone who has heard his risible Badger, Badger, Badger song would reckon he's the last person to talk about music.
His letter denigrates the memory of these two men and is so wide of the mark as to be risible.
There are plenty of holes in the cliched plot and some risible lines.
feelstotally unoriginal, ithaselements of The Transporter, Terminator and the far better dystopianfantasy Children OfMen, but worse still - its plotisnonsenseand its acting risible.
It is risible stupidity of the highest order and at a time when council tax rises are affecting the pockets of most of us, I am sure I am not alone in feeling entitled to an explanation and apology from those responsible.
In our opinion, the history of the Aquatics Centre shows a risible approach to cost control and that the Games organisers seem to be willing to spend money like water.