tremor

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tremor

a minor earthquake

Tremor

 

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.

tremor

[′trem·ər]
(geophysics)
A minor earthquake. Also known as earthquake tremor; earth tremor.
(medicine)
Involuntary, rhythmic trembling of voluntary muscles resulting from alternate contraction and relaxation of opposing muscle groups.
References in periodicals archive ?
To examine the association between chronic lead exposure and action tremor, we used data from participants in the Department of Veterans Affairs (VA) Normative Aging Study (NAS), a cohort of communitydwelling elderly men in the Greater Boston, Massachusetts, area with measures of lead in bone (a biomarker of cumulative lead exposure) and blood (a biomarker of recent exposure) and measures of tremor.
The purpose of this case study was to characterize the effects of VIM DBS in a person diagnosed with PD who was tremor predominant and experiencing both resting and action tremor, on the contralateral and ipsilateral control of force.
Essential tremor (ET) is a neurologic disease that is characterized by an action tremor of the hands and/or head.
Esential tremor is faster than parkinsonian tremor (6 to 9 cycles per second), is primarily an action tremor, and is usually bilateral.
Action tremors -- They happen when you move deliberately.