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 ?
Slow metabolizers, in contrast, might maintain too much of the drug, leading to unpleasant side effects such as jitteriness or loss of libido.
The result, according to VPX, is that Meltdown has been formulated to burn fat at an unprecedented rate while increasing mental clarity and mood with minimal jitteriness.
Stocks fell almost across the board from the outset of trading due to jitteriness in the outside environment such as the U.
He also used olanzapine to blunt jitteriness and anxiey that occurred when he used cocaine, and on occasion took olanzapine to help "come down" from cocaine.
Caffeinism is caused by toxic levels of caffeine with symptoms that include: nausea, diarrhea, indigestion, irregular heartbeat, irregular respiration (breathing), light-headedness, jitteriness, and frequent urination.
Infants continue to have increased jitteriness in the first year and reduced visual perception and visual recognition skills.
Further evidence of this was seen when half of the frequent tanners developed nausea and jitteriness with the 15-mg dose.
The only tell-tale signs of the legacy left by his heavy drug abuse is a slight Ozzy-style slur in his speech and nervy jitteriness that, as he orders a latte from the bar, makes me question if caffeine is necessarily the best option.
As testament to her jitteriness, Samia looks aghast when she spots our photographer placing her satin high heels on the windowsill to take a quick snap.
These symptoms include jitteriness, headaches, stomachaches and other psychosomatic problems, as well as anxiety, panic attacks, distractibility and depression.
It is characterized by excessive, chronic worry, free-floating anxiety and jitteriness.