laughter

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Related to tittering: teetering on the edge
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 ?
Bride Mary McCarthy vowed to keep her maiden name at work to stop shoppers tittering when she is called to the check-outs in the run-up to Christmas.
Cruise caused the most excitement, but it was Nick Nolte who set off widespread tittering.
In a grade-school religion claw, she listened as one female teacher sternly lectured a roomful of tittering girls: "As you grow older and become a woman, you are going to grow hair under your arms.
And he couldn't help tittering when we tried out a few quips from our resident joker Greg Bennett - of Greg's Giggles fame on the Letters page.
In the '60s and early '70s, Americans bought millions of tickets to big-cast chase comedies, guffawing at the calamity, tittering at the compromising positions and actually enjoying all the excessive mugging.
But stop tittering, the race raises cash for local charity.
Her pompous boyfriend barely avoids tittering like an overcivilized twit as he announces, ``Oh, by the way, Placido Domingo's going to be at the Met next month - I'll get us box seats.
APPARENTLY much tittering ensued at the Fraser Inquiry when Bovis boss Alan Mack was asked when it would be that the new Parliament building in Edinburgh would be finished.
Eventually, George Lucas' ``Star Wars Episode 3: The Blandly Titled Cash Cow'' edges out Eric Rohmer's ``Yet More Civilized French People Yammering and Tittering About Relationships and the Weather'' for best picture of 2003.
And guests wanted to know all about that tittering, spittle-laden laugh heard throughout the performance.
The only glimmer of humor to be salvaged from ``Friends and Lovers,'' an inept farce with the mentality of a tittering 15-year-old boy peering under the bedcovers with a flashlight, emanates from Robert Downey Jr.