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In medicine (neurology), bradykinesia denotes "slow movement" (etymology: brady = slow, kinesia = movement). It is a feature of a number of diseases, most notably Parkinson's disease and other disorders of the basal ganglia. Rather than being a slowness in initiation (see hypokinesia) bradykinesia describes a slowness in the execution of movement. It is one of the 3 key symptoms of parkinsonism, which are bradykinesia, tremor and rigidity. Bradykinesia is also the cause of what is normally referred to as "stone face" (expressionlessness) among those with Parkinsons. A very detailed explanation of this topic can be found at http://www.wemove.org/bradykinesia

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