Why are voluntary head movements in cervical dystonia slow?

Aasef G. Shaikh, Aaron Wong, David Samuel Zee, H. A. Jinnah

Research output: Contribution to journalArticle

Abstract

Introduction: Rapid head movements associated with a change in fixation (head saccades) have been reported to be slow in cervical dystonia (CD). Such slowing is typically measured as an increase in time to complete a movement. The mechanisms responsible for this slowing are poorly understood. Methods: We measured head saccades in 11 CD patients and 11 healthy subjects using a magnetic search coil technique. Results: Head saccades in CD took longer to reach a desired target location. This longer duration was due to multiple pauses in the trajectory of the head movement. The head velocity of each segment of the (interrupted) head movement was appropriate for the desired total movement amplitude. The head velocity was, however, higher for the amplitude of the individual interrupted movements. These results suggest that brain programs the proper head movement amplitude, but the movement is interrupted by pathological pauses. Conclusion: Voluntary head saccades have a longer duration in CD due to frequent pauses. The frequent pauses reflect pathological interruptions of normally programmed intended head movement.

Original languageEnglish (US)
Pages (from-to)561-566
Number of pages6
JournalParkinsonism and Related Disorders
Volume21
Issue number6
DOIs
StatePublished - Jun 1 2015

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Torticollis
Head Movements
Saccades
Head
Healthy Volunteers
Brain

Keywords

  • Bradykinesia
  • Cerebellum
  • Dystonia
  • Head movement
  • Movement disorder
  • Saccade

ASJC Scopus subject areas

  • Geriatrics and Gerontology
  • Clinical Neurology
  • Neurology

Cite this

Why are voluntary head movements in cervical dystonia slow? / Shaikh, Aasef G.; Wong, Aaron; Zee, David Samuel; Jinnah, H. A.

In: Parkinsonism and Related Disorders, Vol. 21, No. 6, 01.06.2015, p. 561-566.

Research output: Contribution to journalArticle

Shaikh, Aasef G. ; Wong, Aaron ; Zee, David Samuel ; Jinnah, H. A. / Why are voluntary head movements in cervical dystonia slow?. In: Parkinsonism and Related Disorders. 2015 ; Vol. 21, No. 6. pp. 561-566.
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