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 ?
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.
Aside from one very public matter--a bleeding guerrilla war in Iraq--about the only lasting effect of the arracks is the higher level of jitteriness that most Americans quietly carry around inside of them.
Symptoms have included serious neurological effects, such as seizures, as well as vomiting, jitteriness and rapid eye movement.
The study also found that the products double or triple the risk of side effects such as nausea, vomiting, jitteriness and palpitations.
A benzodiazepine also may be used temporarily to counteract the jitteriness (Noyes et al.
The only likely side-effect might be a mild jitteriness.
Some of the Ritalin-receiving patients reported jitteriness as a side effect.
In its milder forms, hypoglycemia leads to symptoms of nervousness, jitteriness, sweating, rapid heartbeat, and hunger.
The character is now a constable instead of a teacher, but his jitteriness remains.
It can cause elation and feelings of connection and empathy as well as restlessness and jitteriness.
Clinical signs of tachycardia, gastrointestinal intolerance, and jitteriness have been reported as indications of toxicity, and monitoring is indicated when these symptoms are present.