How can myoclonus be distinguished from chorea and tics ?

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CONCLUSION:Myoclonus is defind as a brief ,sudden,shock like jerk that may be caused not only the active muscle contractions ( positive myoclonus) but also lapse of muscle contraction ( negative myoclonus). Many of the individual movements of chorea are myoclonic,but ,unlike myoclonus,they are continuous,occurring in a constant flow.Tics may resemble myoclonus ,but they are usually preceded by primonitory feelings ,and patients usually have some degree of control over them.