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Keywords:

  • Essential tremor;
  • Resting-postural tremor;
  • Head, axis

Abstract

When essential tremor involves the head, it produces a rhythmic, periodic movement with a certain fixed frequency and a variable amplitude. The axis of the tremor has been described as either horizontal (no-no) or vertical (yes-yes) and is present when the head is in an action or postural position. Seven patients who differ in symptoms are described; one subgroup exhibited a combined resting-postural head tremor with a changing axis.