tic

Pathol

spasmodic twitching of a particular group of muscles

Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

TIC

(Token Ring Interface Card) Slang for a Token Ring NIC (network interface card). See token ring network.

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The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Tic

an involuntary muscular contraction; a form of hyperkinesia. A tic may be related to the effect of encephalitis on parts of the brain; it may be a congenital pathological condition, frequently associated with a neuropathic personality; it may appear with attacks of trigeminal neuralgia (tic douloureux); or it may result from neuritis of the facial nerve. A distinction is made between generalized tics, involving all the muscles, and local tics, which are more common. The muscles usually affected are those of the face and neck. The twitching resembles such voluntary movements as winking, frowning, lip-smacking, or lip-licking. Tics generally disappear during sleep and become more severe under emotional stress. Treatment consists of the administration of sedatives, tranquilizers, and anticonvulsants.

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References in periodicals archive

A history of anxiety disorders, pronounced tics during the initial exam, and having three or more vocal tics -- such as throat clearing or making other noises -- indicated a likelihood of tics at the one-year follow-up.

The University of Wisconsin Health System has more on tics.

How Do Kids Learn To Turn Off Troublesome Tics?

Neurotrophic factors act as reciprocal mediators between the neurons and the immune system cells to provide modulation of the immune system.4 There is evidence that immunoreactivity plays a role in the etiopathogenesis of autism spectrum disorder, chronic schizophrenia, and major depressive disorder.5-7 Because tic disorders are associated with neurodevelopmental origin, changes in dopaminergic neurons, and the formation of immunoreactivity, it is thought that neurotrophic factors may be crucial in the emergence of tic disorders.

GDNF is another important neuropeptide for the development of dopaminergic and noradrenergic systems.8 In this study, we aimed to investigate the role of neurotrophic factors in the etiopathogenesis of Tic disorder.

The Role of Nerve Growth Factor (NGF) and Glial Cell Line-Derived Neurotrophic Factor (GDNF) in Tic Disorders

holdings of other investment are captured by the TIC reporting system.

How BEA Aligns and Augments Source Data From the U.S. Treasury Department for Inclusion in the International Transactions Accounts

Figure 8 shows the indentation of sample 10 which was produced with 100% of Al, 8% of SiC, and 8% of TiC. It is evident from these figures that the hardness of the composite material was much higher than that of the pure metal.

On the Mechanical Properties of Hybrid Aluminium 7075 Matrix Composite Material Reinforced with SiC and TiC Produced by Powder Metallurgy Method