Tic Disorders and Comorbid Psychiatric Conditions

Tic disorders are neurodevelopmental conditions defined by the presence of sudden, repetitive, non-rhythmic movements or vocalisations. They span a spectrum from transient tic disorder to chronic motor or vocal tic disorder and the more complex Tourette syndrome, which combines both motor and vocal phenomena. Onset typically occurs in early childhood, with peak severity in adolescence and partial remission in adulthood. Beyond the core tics, individuals frequently experience comorbid psychiatric conditions, most commonly attention-deficit hyperactivity disorder, obsessive–compulsive disorder, anxiety and mood disturbances. These co-occurring conditions often interact bidirectionally with tic severity to exacerbate functional impairment, reduce quality of life and complicate treatment planning. Neurobiological models implicate dysfunction within cortico-striato-thalamo-cortical circuits and alterations in inhibitory neurotransmission, while genetic and environmental factors contribute to individual variability in presentation. Management is multimodal, encompassing psychoeducation, behavioural therapies, pharmacotherapy and, in refractory cases, neuromodulation. Recent advances aim to refine circuit-based interventions and tailor behavioural approaches to developmental and contextual factors, thereby improving long-term outcomes and reducing disability.

Research from Nature Portfolio

Recent studies have elucidated the network architecture underlying symptom generation and treatment response. In deep brain stimulation cohorts, optimal tic reduction correlates with the degree of connectivity between thalamic stimulation sites and action-related functional networks, notably the cingulo-opercular and somato-cognitive motor circuits. This association has been replicated across independent patient groups and observed in lesion-induced tic cases, underscoring a causal role for these networks in both the pathophysiology and therapeutic modulation of tic severity. Such findings guide precision targeting for neuromodulation and advance our mechanistic understanding of tic disinhibition within large-scale brain systems.

Tic Disorders and Comorbid Psychiatric Conditions publication trend

The graph below shows the total number of articles in tic disorders and comorbid psychiatric conditions across all publications each year (not limited to Nature Index journals).

Technical terms

Tic: A sudden, rapid, recurrent, non-rhythmic motor movement or vocalisation.

Premonitory urge: A sensory phenomenon or inner tension that precedes a tic and is relieved by its execution.

Comorbidity: The co-occurrence of two or more disorders or disease processes in an individual.

Deep brain stimulation (DBS): A neurosurgical intervention that delivers electrical pulses to specific brain regions to modulate pathological circuits.

Resting-state functional network: Brain regions that show synchronous activity patterns when an individual is not performing a task, reflecting intrinsic connectivity.

Habit reversal training (HRT): A behavioural therapy teaching awareness of tics and development of competing responses to inhibit them.

Exposure and response prevention (ERP): A behavioural technique involving habituation to premonitory urges while refraining from ticcing.

References

1. Behavioral Interventions for Children and Adults with Tic Disorder. Annual Review of Clinical Psychology (2023).
2. A critical role of action-related functional networks in Gilles de la Tourette syndrome. Nature Communications (2024).
3. Impact of the COVID-19 pandemic on incidence of tics in children and young people: a population-based cohort study. EClinicalMedicine (2023).
4. Comparison of children and adults in deep brain stimulation for Tourette Syndrome: a large-scale multicenter study of 102 cases with long-term follow-up. BMC Medicine (2024).
5. Internet-Delivered Exposure and Response Prevention for Pediatric Tourette Syndrome. JAMA Network Open (2024).
6. Comorbidities, Social Impact, and Quality of Life in Tourette Syndrome. Frontiers in Psychiatry (2016).