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Krebs has divided the abnormal muscular movements of epidemic encephalitis into two groups which he compares with types of muscular movement occurring in various diseases. One type of movement is a twitching, a myoclonia, which does not move the limbs or trunk. This is bilaterally symmetrical. The other type of movement is spasmodic and moves the limbs. The movements of athetosis are cited. They are usually unilateral. The first type of movement does not produce deformity of the limbs or trunk, the second finally does. Voluntary innervation stops the first type, but does not stop the second. Krebs states that when no movements are present a "static" contraction will bring on the myoclonic twitchings while a "dynamic" or "kinetic" contraction will bring on the spasmodic movements.
Krebs proposes the following classification of Group 1: A first group of myoclonias, characterized by absence of rhythm and synchronism in the production of
Essai sur les Caractéres Intrinsèques des Secousses Musculaires et des Mouvements Involontaires Rhythmés Observés au Cours de l'Encéphalite Epidémique. Arch NeurPsych. 1924;11(1):112. doi:10.1001/archneurpsyc.1924.02190310118013
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