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TMS electrophysiological biomarkers show distinct patterns across ADHD, Tourette syndrome, MDD, ASD, and CPBrain scans help identify ADHD and other childhood neurological disorders

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Key Takeaway
Note that TMS biomarkers show distinct patterns across several pediatric neurological disorders but remain preliminary.

This meta-analysis synthesized 26 studies to evaluate the diagnostic discriminability of transcranial magnetic stimulation (TMS) electrophysiological biomarkers in children and adolescents with ADHD, Tourette syndrome, MDD, ASD, and CP. The analysis focused on several key measures including SICI ratios, cortical silent period (CSP), intracortical facilitation (ICF), long-interval intracortical inhibition (LICI), and interhemispheric asymmetry.

Key findings include increased SICI ratios in ADHD, while CSP was shortened in patients with ADHD, Tourette syndrome, and MDD. Additionally, enhanced ICF and weakened LICI were observed in MDD. Atypical interhemispheric asymmetry was noted in both ASD and CP. These markers provide a multidimensional approach to characterizing brain states in pediatric populations.

The authors note that the evidence is preliminary and requires larger-scale studies to confirm these trends. While TMS may inform more precise clinical evaluation and early intervention strategies, it should not currently be used as a definitive clinical screening tool due to the limited scope of current data.

How this fits prior evidence

This meta-analysis addresses gaps in objective diagnostic markers for pediatric neurological disorders. It complements existing evidence regarding ASD by providing a physiological perspective on brain states, similar to how AI is being explored for diagnosis and behavior analysis. While other findings highlight the complexities of identifying treatment-resistant depression, this study focuses on the electrophysiological signatures of MDD.

Doctors are looking for better ways to understand how the brain functions in children with conditions like ADHD, Tourette syndrome, and autism. A review of 26 studies looked at using transcranial magnetic stimulation (TMS). This is a non-invasive way to measure how different parts of the brain communicate by sending magnetic pulses.

The study found that these magnetic measurements could help distinguish the brain activity of children with ADHD from those without it. It also identified specific patterns in kids with Tourette syndrome, major depression, and autism. For example, researchers saw changes in how the brain processes signals in children with ADHD and others with cerebral palsy.

While these results are promising for creating more precise ways to evaluate children, the evidence is still preliminary. Because the data comes from a collection of smaller studies, larger research is needed to confirm these trends. These findings suggest that magnetic tools could eventually help doctors better understand each child's unique brain state.

What this means for you:
Magnetic pulses may help doctors identify specific brain patterns in children with ADHD and other conditions.

Common questions

What is transcranial magnetic stimulation?

Transcranial magnetic stimulation (TMS) uses magnetic pulses to measure how the brain communicates. In this study, it was used as a way to see different brain states in children and adolescents with conditions like ADHD, Tourette syndrome, and autism.

Can this method help diagnose ADHD?

The research shows that certain measurements from TMS can distinguish the brain activity of children with ADHD from those without it. However, these results are preliminary and need larger studies to confirm if they can be used as a standard tool.

Which other conditions were studied?

The study looked at several conditions including Tourette syndrome, major depression, autism spectrum disorder, and cerebral palsy. It found specific brain patterns for each of these conditions using magnetic pulse measurements.

Study Details

Study typeMeta analysis
EvidenceLevel 1
PublishedJun 2026
View Original Abstract ↓
This systematic review and meta-analysis examined the application of transcranial magnetic stimulation (TMS) electrophysiological biomarkers in children and adolescents, focusing on their role in assessing neurological disorders. We synthesized data from 26 studies to compare TMS measures between healthy children/adolescents and adults, and evaluated their diagnostic discriminability in attention-deficit/hyperactivity disorder (ADHD), Tourette syndrome (TS), major depressive disorder (MDD), autism spectrum disorder (ASD), and cerebral palsy (CP). Key findings revealed that, ADHD was associated with increased SICI ratios and shortened cortical silent period (CSP); TS showed reduced CSP; MDD exhibited decreased CSP, enhanced intracortical facilitation (ICF), and weakened long-interval intracortical inhibition (LICI). Additionally, atypical interhemispheric asymmetry in TMS measures was observed in ASD and CP. These results provide preliminary evidence that TMS-derived electrophysiological biomarkers may reflect critical developmental and pathological variations in cortical excitability and inhibition. While these findings represent preliminary evidence, they highlight the potential of TMS as a supportive tool for early clinical screening and offer valuable mechanistic insights that could eventually inform more personalized intervention strategies for pediatric neurological disorders. IMPLICATIONS: This meta-analysis provides preliminary evidence for the potential for the potential diagnostic utility of TMS-derived neurophysiological biomarkers in children and adolescents with neurological disorders. The diversity of TMS biomarkers and their observed relevance to disease-specific neuropathology suggest that TMS may offer a non-invasive, multidimensional approach to characterizing brain state in pediatric populations. While further large-scale studies are needed to confirm these trends, our findings offer insights that could eventually inform more precise clinical evaluation and early intervention strategies.
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