jitter

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jitter

(jĭt'ĕr),
The random variability of the cycle-to-cycle duration of vocal fold vibration; contributes to the perception of a rough or harsh voice quality.
Imaging Low amplitude irregularities in echo location on an ultrasound display, attributed to electronic noise, mechanical disturbances, and other nonspecific variables
Physiology Muscle jitter The normal electric variability—‘chaos’—measured by single-fiber EMG—in the interval between 2 action potentials of successive discharges of the same single muscle fiber in the same motor unit; jitter is characterised as instability in subcomponents of motor unit action potentials, and is due to the variation in the synaptic delay at the branch points in the distal axon and at the neuromuscular junction; like fiber density, jitter is increased in neuropathic conditions (motor neuron diseases)—e.g., myasthenia gravis—is accompanied by denervation and reinnervation, and attributed to inefficient transmission of impulses in recent neural collaterals, or due to blocking—abnormal neuromuscular transmission; it is normal or near-normal in myopathic disease
Psychology See Jitters

jitter

Imaging Low amplitude irregularities in echo location on an ultrasound display, attributed to electronic noise, mechanical disturbances, and other variables Neurophysiology Muscle jitter The normal electric variability–'chaos'–measured by single-fiber EMG–in the interval between 2 action potentials of successive discharges of the same single muscle fiber in the same motor unit; jitter is characterized as instability in subcomponents of motor unit action potentials, and is due to the variation in the synaptic delay at the branch points in the distal axon and at the neuromuscular junction; like fiber density, jitter is ↑ in neuropathic conditions–motor neuron diseases–eg, myasthenia gravis, is accompanied by denervation and reinnervation, and attributed to inefficient transmission of impulses in recent neural collaterals, or due to blocking–abnormal neuromuscular transmission; it is normal or near-normal in myopathic disease. See Fiber density, Single-fiber electromyography PsychologyJitters, see there.
References in periodicals archive ?
A revitalised JED will fancy their chances of claiming a rare win at Myreside against jittery WATSONIANS.
Swaraj, addressing the minister, said her inquiry for a report on the girls - who belong to a Hindu family - made Chaudhry 'jittery'.
Summary: Lucknow (Uttar Pradesh) [India], Dec 23 (ANI): Home Minister Rajnath Singh on Sunday found himself in a jittery situation after slogans demanding the construction of Ram temple in Ayodhya were raised in the middle of his speech in Lucknow.
Despite the new highs, implied volatility in the coffee chain is higher, near 20% in the short term, suggesting traders may be a bit jittery about share performance into the holiday season.
on Wednesday said it is deferring its initial public offering, citing jittery market conditions.
Authorities urged people on Friday to refrain from calling the ambulance service for non-emergencies, after receiving scores of calls daily from jittery parents and teachers for minor injuries following the death of a 10-year-old boy after a school accident last week.
KARACHI -- A Rangers official and a passerby were shot at and wounded by alleged robbers in Gulistan-i-Jauhar on WedAnesday evening as the suspects became jittery on seeing the paramilitary force personnel, police said.
Quins coach Joe Nganga, who saw his side lose for the second successive weekend - after losing to Kabras 22-13 A!- said they were jittery and poor in execution.
Elizabeth Thomas, the Tennessee teen who was subject of multi-state Amber Alert for over a month, is suffering from panic attacks and is jittery, according to her family.
The precious metal became a bit volatile during President-Elect Donald Trump's press conference, mainly because the US stock and bond markets became very jittery.
Anesthesiology faculty reported significant increases in feeling irritable, jittery, and sleepy, along with significant decreases in feeling confident, energetic, and talkative following an on-call period, according to a study presented at the annual meeting of the American Society of Anesthesiologists.
The belt discovery - along with a mobile now being scrutinised - came as the police's chief negotiator said the Bataclan gunmen were "jittery" like they were "on drugs".