This phenomenon is called myoclonus (myo = muscle, clonus = contraction) and it is basically a short, sudden and involuntary movement of a muscle or group of muscles. You know that feeling when you're ...
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What is clonus?

Clonus causes involuntary, rhythmic muscle contractions when a muscle is stretched. It is often observed in conditions like multiple sclerosis, stroke, and cerebral palsy. Clonus can be diagnosed by ...