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Sign language tics in a prelingually deaf man.

H R Morris1, A J Thacker, P K Newman

  • 1National Hospital for Neurology and Neurosurgery, London, UK.

Movement Disorders : Official Journal of the Movement Disorder Society
|April 7, 2000
PubMed
Summary
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Gilles de la Tourette syndrome involves vocal and motor tics. In a deaf patient, these manifested as sign language tics, offering new insights into Tourette syndrome and sign language equivalence.

Area of Science:

  • Neurology
  • Linguistics
  • Psychiatry

Background:

  • Gilles de la Tourette syndrome presents with involuntary vocal and motor tics.
  • Vocal tics can include noises, words, coprolalia (obscenities), and echolalia (speech repetition).

Observation:

  • A case study of a prelingually deaf individual with Gilles de la Tourette syndrome.
  • This patient exhibited typical motor tics and sign language tics analogous to vocal tics.

Findings:

  • The study reports the first instance of sign language tics in a prelingually deaf patient with Tourette syndrome.
  • Vocal language tics were replaced by equivalent tics expressed through sign language.

Implications:

  • This phenomenon suggests a dissociation between language modality and the expression of tics.

Related Experiment Videos

  • It supports the view of sign language as a fully equivalent linguistic system to spoken language for complex neurological conditions.