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Related to essential tremor: intention tremor, head tremor


a minor earthquake
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



an involuntary trembling of the entire body or parts of it. Tremors are characteristically rhythmic and stereotypic; usually they have a narrow range, most often affecting the fingers, eyelids, tongue, lower jaw, and head. In healthy subjects, tremors may be caused by muscular strain, emotional excitement, or exposure to cold. Pathological tremors may be symptoms of chronic alcoholism, thyrotoxicosis, neurotic states, acute infections, and such diseases as parkinsonism. The symptom is treated by treating the primary disease.

Eye tremor is an involuntary rapid movement of the eyeball in relation to the optic axis; its frequency is from 20 to 150 Hz, and its amplitude, from 5 to 15 seconds of arc. Visual perception itself depends to a significant degree on eye tremor, which produces constant changes in the illuminance of certain photoreceptors—that is, the photoreceptors located at the variously illuminated points of the retinal periphery. An image whose projection on the retina remains completely stable for more than a few seconds ceases to be perceived by the visual centers of the brain.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.


A minor earthquake. Also known as earthquake tremor; earth tremor.
Involuntary, rhythmic trembling of voluntary muscles resulting from alternate contraction and relaxation of opposing muscle groups.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
About 6m individuals in the US are affected by essential tremor. ET, the most common movement disorder, is characterised by a tremor an involuntary shaking or trembling most often of the hands or arms, which can significantly disrupt daily activities and social interactions.2
and its lead asset, CX-8998; CX-8998 as a potential treatment for essential tremor; Jazz Pharmaceuticals' plans for future development of CX-8998, including the initiation of a Phase 2 clinical study in 2020; potential future payments by Jazz Pharmaceuticals to the former Cavion shareholders and other statements that are not historical facts.
Paisley and Renfrewshire South MP Mhairi Black has backed Hannah in her efforts to raise awareness of essential tremor.
Estimates of the prevalence of essential tremor throughout the world.
Essential tremor: occupational exposures to manganese and organic solvents.
Correlates of functional disability in essential tremor. Movement Disorders, 16(5):914-20.
Roughly 4% of 40-year-olds have essential tremor compared with about 20% of 90-year-olds.
[16] R Ribosa-Nogue and A Gironell, "Essential tremor and Parkinson's disease.
Essential tremor is the most common tremor disorder (1) and second most common movement disorder impacting approximately 7 million individuals in the United States.

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