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 ?
Deep brain stimulation - implanting electrodes into the brain to override faulty electrical signals - has been shown to markedly reduce hand tremor severity.
Use of medications/substances that cause tremors as a side effect.
Essential tremor may be treated with beta blockers or anticonvulsant drugs.
According to the centre, the location of the tremor was 25 kilometres away from Masirah Island, east of Oman and a depth of 2.
The tremors in Tashkent were felt for several minutes.
Essential tremor can cause shaking of the hands, head and voice and is distinct from other tremor-causing conditions such as Parkinson's disease.
Different tremor types have been separated in PD, including classic Parkinsonian tremor at rest, postural and kinetic tremors of different frequencies, pure postural or kinetic tremor.
Like I mentioned above, some tremors are physiological.
The rhythm of organic tremors is less affected by voluntary movement in other limbs Loading Pressing down with your hand on the tremulous limb usually diminishes the amplitude of an organic tremor but increases amplitude in a psychogenic disorder Source: Reference 2
Yahya Al-Qahtani assured the people that no injuries to people or damages to properties were reported in the aftermath of the tremors.
None of last year's tremors left any victims and only a few buildings were damaged.