The Role of the Prefrontal Cortex in Tourette Syndrome: A Review of Current Literature

An academic-style literature review examining the relationship between prefrontal cortex function and Tourette Syndrome.

Structural Abnormalities

Research has identified several structural differences in the prefrontal cortex of individuals with Tourette Syndrome:

• Decreased gray matter in the right dorsolateral prefrontal cortex (DLPFC)
• Increased gray matter in the right ventromedial prefrontal cortex (VMPFC)
• Reduced white matter integrity in the left DLPFC

The Disinhibition Hypothesis

The prevailing theory for tic generation centers on disinhibition — the prefrontal cortex's reduced ability to suppress unwanted motor programs originating in the basal ganglia. When the PFC cannot adequately inhibit these signals, they manifest as tics.

Treatment Implications

Current treatment modalities targeting PFC function include:

• Pharmacological: Antipsychotics and alpha-2 agonists
• Behavioral: CBIT (Comprehensive Behavioral Intervention for Tics)
• Non-invasive stimulation: TMS (Transcranial Magnetic Stimulation), tDCS (Transcranial Direct Current Stimulation)

This review advocates for future research into fNIRS neurofeedback as a promising, non-invasive approach to strengthening prefrontal cortex function in Tourette Syndrome patients.