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| Ataxia Ataxia is the inability to make smooth, accurate, and coordinated movements, often due to disease of the cerebellum. |

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| Bradykinesia Bradykinesia is an extreme slowness and stiffness of movement, often due to parkinsonian syndromes. |

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| Chorea and Choreoathetosis Choreoathetosis is a syndrome of continuous random movements that |

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| Dystonia Dystonia is a syndrome of abnormal muscle contractions that lead to |

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| Myoclonus Myoclonus is a condition of very rapid and brief shock-like jerks. |

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| Psychogenic Disorders Psychogenic disorders span the full range of possible symptoms, including tremor, dystonia, ataxia, bradykinesia, and chorea. |

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| Spasticity Spasticity is an increase in muscle stiffness that worsens with rapid |

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| Tics Tics are repetitive, stereotyped, and sometimes complex involuntary |

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| Tremor Tremor is a rhythmic back-and-forth shaking at rest or with movement. |