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Keywords:

  • Cranial dystonia;
  • Blepharospasm;
  • Paraspasm;
  • Circadian rhythms

Abstract

Eleven patients with cranial dystonia were investigated for diurnal variations in disability by means of video recordings. Disability increased significantly from morning to evening. The increase was not related to changes in vigilance levels assessed by dynamic electroencephalogram. Cranial movement disorders display diurnal fluctuations that are probably related to endogenous circadian rhythms.