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Related to essential tremor: intention tremor, head tremor


a minor earthquake



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.


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.
References in periodicals archive ?
There are more than 10 million people in the US alone with essential tremor today and an estimated 1 million with Parkinson's disease.
In essential tremor, the tremor usually begins in one arm or hand.
Spasmotic dysphonia): This involuntary contraction of the laryngeal muscles produces a halting and strained voice and can be misdiagnosed as essential tremor or persistent laryngitis.
Published ahead of print in the Journal of Neurology, Neurosurgery and Psychiatry, the study looked at the drinking patterns of a group of 3,285 patients aged 65 and over, 76 of whom developed essential tremor in a three-year follow-up period.
Mr Roberts, of Llandegla, will have an operation to rectify the condition called benign essential tremor at the Walton Centre for Neurology and Neurosurgery at Fazakerley Hospital on Merseyside on Wednesday.
A new computer mouse adapter is making it easier for people with essential tremor or other tremor conditions such as Parkinson's disease to open an e-mail and navigate a Web site.
IBM cites statistics from the International Essential Tremor Foundation, which says that nearly 10 million people are affected by Essential Tremor, the most common form of hand tremors.
It will look at the condition of essential tremor, of which there are an estimated 500,000 sufferers in the UK.
Essential Tremor [ET], the most common neurological movement disorder, has been described as a purely medical condition, with little consideration of how principles of behavior may come to exert joint control over tremor, related negative emotional arousal, and verbal behavior.
This title of a novel by the 19th century Scottish author George Macdonald could well describe the feelings of the estimated 3-4 million Americans who are affected by essential tremor (ET).
Additional chapters focus on topics including, but not limited to, spinocerebellar degenerations, neurodegeneration with brain iron accumulation, immune-related chorea, cancer-related paraneoplastic syndromes, myoclonus, essential tremor, dystonia, tartive dyskinesia, and tics and stereotyped movements in children.
SPECT imaging with DaTscan can help physicians determine if a patient's movement difficulties are due to a parkinsonian syndrome or another condition such as an essential tremor.

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