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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
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.


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.
Medical Dictionary, © 2009 Farlex and Partners
References in periodicals archive ?
While some tittered shyly, the less subtle guffawed as Cook settled into his crouching stance before beginning his run up. Chance would be a fine thing for Mr Titter, still more a gay acorn than a gay icon, despite occasional guesting on Count Arthur Strong's Radio Show (another acquired taste).
Apparently, ceilidh bands who announce that the next dance will be the Gay Gordons have been met by titters from dancers who get the wrong idea.
The French used to titter about his single-minded devotion to his wife, thinking it very peculiar compared to their presidents' lust-filled lives.
For One Night Only - actually running for six nights - sit in the Unity's 'adult' Christmas show slot vacated this season by Terry Titter.
Some people might titter at the case of Bernadette Smith we report today and think it is not that big a deal.
All these alleged insults are nothing of the kind, simply the lumbering attempt at wit men use to feel macho - and usually accompanied by a braying laugh that fades to a nervous titter.
Now every time he walks down a corridor in Westminster people will snigger and titter while making two-inch air drawings with their fingers.
Titter ye may at the camp comic's false teeth and infamous toupee.
He added: 'The Gay Gordons can raise a titter if the audience are not familiar with Scottish country dancing and, in order to avoid a cheap joke, it is switched.'
It's a case that will hit the headlines and no doubt raise a titter or two.
Apart from the odd embarrassed titter, the audience was silent throughout the play about a girl with learning difficulties whose obsessional love for the wrong man has disastrous consequences.