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Amplitude: A fine tremor is very small or barely noticeable movement; a coarse tremor is a large movement. Tremors in between these two may be described as medium amplitude. Frequency: A slow tremor makes a motion at a few times per second. A rapid or fast tremor is around 12 Hz or faster.
Intention tremor is a dyskinetic disorder characterized by a broad, coarse, ... and especially fine motor movements. When the cerebellum is damaged, a person may have ...
Essential tremor (ET), also called benign tremor, familial tremor, and idiopathic tremor, is a medical condition characterized by involuntary rhythmic contractions and relaxations (oscillations or twitching movements) of certain muscle groups in one or more body parts of unknown cause. [6]
A fasciculation, or muscle twitch, is a spontaneous, involuntary muscle contraction and relaxation, involving fine muscle fibers. [1] They are common, with as many as 70% of people experiencing them. [1] They can be benign, or associated with more serious conditions. [1]
Four motor signs are considered cardinal in PD: tremor, rigidity, bradykinesia, and postural instability (also referred to as parkinsonism). [1] Tremor is the most apparent and well-known sign. [1] It is also the most common; though around 30% of individuals with PD do not have tremor at disease onset, most develop it as the disease progresses. [1]
Resting tremor is the most common, but kinetic tremors—occurring during voluntary movements—and postural tremor—preventing upright, stable posture—also occur. [19] Tremor largely affects the hands and feet: [ 19 ] a classic parkinsonian tremor is " pill-rolling ", a resting tremor in which the thumb and index finger make contact in a ...
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inability to coordinate fine motor activities (intention tremor), e.g. "past-pointing" (pointing beyond the finger in the finger-nose test) inability to perform rapid alternating movements (dysdiadochokinesia), e.g. inability to rapidly flip the hands; involuntary horizontal eye movements
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