Autism and Tourette Syndrome: Managing Tic Disorders in Ontario

Differentiating Tics from Stimming

Tics are sudden, rapid, recurrent motor movements or vocalizations that are semi-voluntary — the person feels an urge (premonitory urge) before the tic and temporary relief after. Stimming is self-stimulatory behavior that serves a regulatory function — it provides sensory input, emotional regulation, or focus. The person generally does not experience a preceding urge with stimming.

In practice, differentiation can be complex. Some autistic individuals experience both tics and stims simultaneously. Motor tics may co-occur with motor stereotypies. A clinician must assess whether the behavior is preceded by a premonitory urge, whether suppression causes discomfort or just frustration, and whether the behavior serves a regulatory function or occurs involuntarily.

Accurate differentiation matters because treatment pathways diverge. CBIT (Comprehensive Behavioral Intervention for Tics) targets the urge-tic cycle. Suppressing stimming — which serves a regulatory function — is not appropriate and can cause harm. Both behaviors should be accommodated in school and work settings.

CBIT and Therapy Adaptations

Comprehensive Behavioral Intervention for Tics (CBIT) is the first-line behavioral treatment for tic disorders. It teaches the individual to recognize premonitory urges and implement a competing response. For autistic individuals, CBIT adaptations include visual supports for the competing response chain, concrete language, explicit instruction in urge recognition (which may overlap with interoception difficulties), and careful distinction between tic targets and stim preservation.

Habit Reversal Training (HRT), a component of CBIT, has been adapted for autistic populations. Research by Capriotti et al. (2014) demonstrated that with appropriate modifications, autistic children can benefit from CBIT. Sessions may need to be shorter, more frequent, and incorporate the child's special interests as motivators.

Medication and Ontario Services

When tics significantly impair function, medication may be considered alongside behavioral therapy. Alpha-2 agonists (clonidine, guanfacine) are often first-line, particularly because guanfacine also addresses ADHD symptoms that frequently co-occur in this population. Antipsychotics (aripiprazole, risperidone) are reserved for severe tics due to side effect profiles. Medication management should involve a physician experienced in both autism and tic disorders.

Ontario specialist services include the Tourette Syndrome Neurodevelopmental Clinic at the Hospital for Sick Children (SickKids) in Toronto, which sees children with co-occurring autism and Tourette syndrome. McMaster Children's Hospital in Hamilton offers neurodevelopmental assessment. For adults, the Movement Disorders Clinic at Toronto Western Hospital provides Tourette assessment. OHIP covers all physician visits and hospital-based services.

School accommodations for co-occurring autism and Tourette syndrome should be documented in the student's IEP. Appropriate accommodations include tic-break passes, testing in a separate room, permission to use fidget tools, reduced writing demands, and exemption from penalties related to tic-related disruptions.