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Generating Acute and Chronic Experimental Models of Motor Tic Expression in Rats
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Comprehensive behavioural intervention for tics: a neurophysiological intervention.

Valsamma Eapen1,2, Rudi Črnčec3, Anna Xenia Pick4

  • 1School of Psychiatry, University of New South Wales, 2052 Sydney, Australia.

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Comprehensive Behavioural Intervention for Tics (CBIT) significantly reduces tic severity in Gilles de la Tourette Syndrome (GTS). Neurophysiological changes, particularly involving motor cortical GABAergic circuitry, may underlie this treatment

Keywords:
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Area of Science:

  • Neuroscience
  • Clinical Psychology
  • Pediatric Neurology

Background:

  • Gilles de la Tourette Syndrome (GTS) is a childhood-onset neuropsychiatric disorder.
  • Motor and vocal tics characterize GTS.
  • Comprehensive Behavioural Intervention for Tics (CBIT) is a non-pharmacological treatment for GTS.

Purpose of the Study:

  • To assess the clinical effectiveness of CBIT in reducing tic severity in young people with GTS.
  • To explore the neurophysiological mechanisms linked to clinical improvements from CBIT.

Main Methods:

  • Investigated clinical effectiveness of CBIT in young GTS patients.
  • Explored neurophysiological changes, including Cortical Silent Period (CSP) to motor evoked potential (MEP) ratio (CSP/MEP ratio).

Main Results:

  • Significant improvement in tic severity observed (large effect size).
  • Increased CSP/MEP ratio post-intervention (small effect size).
  • Other neurophysiological inhibition measures did not correlate with tic severity changes.

Conclusions:

  • CBIT treatment in GTS is associated with significant clinical improvement.
  • Motor cortical Gamma-aminobutyric acid (GABA)-ergic inhibitory circuitry may play a role in CBIT's neurophysiological effects.
  • Larger studies with control groups are needed for replication.