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Adults with Tourette syndrome exhibit impaired olfactory identification and discrimination, suggesting central nervous system alterations. This study highlights potential links between social impairment and olfactory dysfunction in Tourette syndrome patients.

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Area of Science:

  • Neuroscience
  • Ophthalmology

Background:

  • Tourette syndrome (TS) is a chronic neurological disorder characterized by motor and vocal tics.
  • Comorbidities like ADHD and OCD are common in TS.
  • Shared neuroanatomical regions and neurotransmitter systems suggest a link between olfactory processing and TS pathophysiology.

Purpose of the Study:

  • To systematically evaluate olfactory functioning in adults with Tourette syndrome.
  • To compare olfactory performance between TS subjects and healthy controls.
  • To investigate the influence of tics, comorbidities, and social impairment on olfactory alterations in TS.

Main Methods:

  • The study included 28 adults with Tourette syndrome and 28 matched healthy controls.
  • Olfactory function was assessed using the "Sniffin Sticks" test battery (odor threshold, discrimination, identification).
  • Clinical scores for tics, comorbidities (ADHD, OCD, anxiety, depression), and social impairment were recorded. Rhinoendoscopy excluded nasal pathology.

Main Results:

  • Tourette syndrome subjects showed significantly lower combined odor scores (p=0.007) and odor identification scores (p=0.008) compared to controls.
  • Lower odor discrimination scores were also observed in TS subjects (p=0.041), while odor threshold did not differ.
  • Regression analysis indicated social impairment as a predictor for lower combined and odor identification scores in TS (p=0.003).

Conclusions:

  • Adults with Tourette syndrome exhibit altered olfactory performance, particularly in odor identification and discrimination.
  • Findings suggest central nervous system involvement in olfactory processing deficits in TS, rather than peripheral nasal issues.
  • Social impairment may contribute to olfactory dysfunction in Tourette syndrome.