Abnormal neuronal activity in Tourette syndrome and its modulation using deep brain stimulation

Area of Science:

• Neuroscience
• Neurology
• Movement Disorders

Background:

• Tourette syndrome (TS) is a childhood-onset disorder with motor and vocal tics, often accompanied by comorbidities.
• Limited pharmacological treatments necessitate exploring alternative therapies like deep brain stimulation (DBS).
• Abnormalities in motor and limbic cortico-basal ganglia (CBG) pathways are implicated in TS.

Purpose of the Study:

• To review recent neurophysiological findings in Tourette syndrome.
• To examine the impact of deep brain stimulation (DBS) on abnormal neuronal activity in TS.
• To discuss these findings within the context of CBG pathway function and DBS.

Main Methods:

• Compilation and analysis of neurophysiological data from noninvasive imaging, invasive recordings in TS patients, and animal models.
• Review of studies applying DBS to various CBG regions (globus pallidus internus, thalamus, nucleus accumbens).
• Discussion of findings in relation to existing models of CBG function.

Main Results:

• Evidence points to system-level physiological changes in CBG pathways in TS.
• Altered baseline neuronal activity and specific tic-related activity patterns are observed.
• DBS is hypothesized to modify neuronal firing and information processing in targeted CBG regions.

Conclusions:

• Neurophysiological data reveal widespread CBG pathway alterations in Tourette syndrome.
• Deep brain stimulation offers a potential therapeutic strategy by modulating aberrant neural activity.
• Further research is needed to fully understand DBS mechanisms in the context of CBG disorders.