Autism Spectrum Symptoms in a Tourette's Disorder Sample

Area of Science:

• Neurodevelopmental disorders
• Clinical psychology
• Genetics

Background:

• Tourette's disorder (TD) and autism spectrum disorder (ASD) share overlapping clinical features and potential etiological factors.
• Understanding the relationship between TD and ASD is crucial for accurate diagnosis and intervention.

Purpose of the Study:

• To investigate the prevalence of ASD symptoms in individuals with TD.
• To analyze the correlations between ASD symptom patterns and TD, obsessive-compulsive disorder (OCD), and attention-deficit/hyperactivity disorder (ADHD).

Main Methods:

• Utilized data from 535 participants with TD and 234 family members from genetic studies.
• Administered the Social Responsiveness Scale Second Edition (SRS) to assess ASD symptoms.
• Collected self-reported data on TD, OCD, and ADHD symptoms.

Main Results:

• Individuals with TD showed SRS scores comparable to other clinical samples but lower than those with ASD.
• A higher percentage of children (22.8%) with TD met ASD criteria compared to adults (8.7%), primarily driven by repetitive and restricted behaviors (RRB).
• SRS scores positively correlated with TD, OCD, and ADHD symptom severity, with higher scores in those with OCD phenotypes.

Conclusions:

• The high rate of ASD symptoms in children with TD may stem from difficulties distinguishing complex tics and OCD from ASD symptoms.
• Differentiating between social communication deficits and repetitive behaviors is essential for accurate ASD assessment in TD.
• The SRS can be a valuable tool for identifying TD patients with social communication impairments, potentially mitigating risks like bullying.