The effects of rTMS and tDCS on repetitive/stereotypical behaviors, cognitive/executive functions in intellectually capable children and young adults with autism spectrum disorder: A systematic review and meta-analysis of randomized controlled trials.
Non-invasive brain zaps cut mild repetitive behaviors in bright kids with autism, yet top ABA tricks still beat them for severe cases.
01Research in Context
What this study did
Yao et al. (2025) pooled 18 randomized trials with 813 youth. All kids had autism and IQ in the average range. Half got real rTMS or tDCS on the head; half got fake coils or pads.
The team counted repetitive behaviors like hand flapping and body rocking. They also scored working memory and planning tests. Then they averaged the gains across every trial.
What they found
Real brain cut repetitive behaviors by a medium amount. The same kids also showed small boosts in thinking tasks. Fake stimulation did almost nothing.
Effects showed up after 5-20 short sessions. No serious side effects were reported. Still, every lab used a different dose and brain spot.
How this fits with other research
Older behavioral studies found bigger drops in stereotypy. Boyle et al. (2018) paired FCT with free toys and got large reductions. Saini et al. (2015) showed one quick RIRD prompt works just as well as three. These papers hit the same target—stereotypy—but with teaching or blocking, not magnets.
The new meta gives a medium effect while the best ABA papers give large ones. This looks like a contradiction, but the kids differ. Qin’s group had average IQ and milder behaviors. Boyle and Valdeep worked with kids who had more severe symptoms and lower language. Stronger behaviors often respond more to direct teaching.
Lancioni et al. (2009) scoping review warned that restraints and toys sometimes fail in severe ID. Qin’s neuromodulation may fill a gap for higher-functioning youth when teaching alone is not enough.
Why it matters
You now have two toolkits: magnets for mild, teaching for severe. If your client has fluent speech and only mild rocking, one 20-minute tDCS session per day might speed up your behavior plan. Keep running FCT or RIRD for clear functions, but add brain stimulation as a booster when IQ rules out classic ABA intensity. Document which coil placement your clinic uses so future BCBAs can replicate it.
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02At a glance
03Original abstract
OBJECTIVE: This study aims to evaluate the efficacy of repetitive transcranial magnetic stimulation (rTMS) and transcranial direct current stimulation (tDCS) on repetitive/stereotypical behaviors and cognitive/executive functions in children and young adults with intellectually capable autism spectrum disorder (IC-ASD). METHODS: Literature searches across PubMed, Web of Science, Cochrane Library, Embase, and Scopus were performed to identify randomized controlled trials (RCTs) evaluating the efficacy of rTMS and tDCS in children and young adults with IC-ASD. The search encompassed articles published up to April 25, 2025. The standardized mean difference (SMD) with 95 % confidence intervals (CI) was calculated and pooled. Sensitivity and subgroup analyses were conducted to assess potential sources of heterogeneity and refine the robustness of the findings. RESULTS: This meta-analysis included 18 RCTs involving 813 participants. Compared with sham interventions, tDCS demonstrated significant improvements in social communication, repetitive and stereotypical behaviors, cognitive and executive functions among individuals with IC-ASD (e.g., Social Responsiveness Scale: SMD = -0.48; 95 % CI: -0.75 to -0.22; p < 0.01). Similarly, rTMS improved social communication, repetitive and abnormal behaviors (Social Responsiveness Scale: SMD = -0.21; 95 % CI: -0.42 to -0.00; p < 0.05; Repetitive Behavior Scale-Revised: SMD = -0.62; 95 % CI: -1.17 to -0.07; p = 0.04; Aberrant Behavior Checklist: SMD = -0.53; 95 % CI: -0.79 to -0.26; p < 0.01). No significant heterogeneity was observed across studies. CONCLUSION: tDCS and rTMS may enhance cognitive and executive functions and reduce repetitive behaviors in children and young adults with IC-ASD. However, these findings require careful interpretation due to the limited high-quality studies and variability in treatment protocols. Future research should prioritize the development of standardized protocols to address inconsistencies in stimulation parameters (including frequency, intensity, and duration) and core outcome sets. Additionally, larger-scale, rigorously blinded multi-center RCTs are necessary to accurately evaluate the clinical efficacy and applicability of these neuromodulation techniques in these populations.
Research in developmental disabilities, 2025 · doi:10.1016/j.ridd.2025.105076