Assessing the impact of Transcranial Direct Current Stimulation (tDCS) over the dorsolateral prefrontal cortex on social communication in children and adolescents with Autism Spectrum Disorder (ASD).
A month of mild brain current improved social talk and cut repetitive moves in 265 youth with autism, but the missing control group keeps the evidence soft.
01Research in Context
What this study did
Doctors placed a small sponge on each child’s forehead. A mild battery sent a tiny current to the dorsolateral prefrontal cortex for 20 minutes.
265 kids and teens with autism did this 5 days a week over the study period. No second group got fake current, so everyone received the real treatment.
Before and after, parents filled out forms about social talk and repetitive actions. Staff also watched kids play and counted stereotypic moves.
What they found
Social-communication scores rose by a medium-large amount. Repetitive behaviors dropped about one quarter.
Gains showed up on both parent forms and direct play tests. Older kids improved a bit more than younger ones.
How this fits with other research
Zheng et al. (2020) saw no benefit when toddlers used a robot joint-attention game. The robot study used a control group and younger kids. Age and method explain the clash: toddlers may need live people, while school-age kids can respond to brain stimulation.
Tabeshian et al. (2022) also cut stereotypy by 25 percent with 12 weeks of Tai Chi classes. Both studies lacked control groups and hit the same effect size, so tDCS is not yet better than gentle exercise.
Chung et al. (2025) ran a true RCT with robots and still boosted social skills. Their stronger design means tDCS must pass a controlled trial before we can trust the new wires over the new robots.
Why it matters
You now have a second low-side-effect tool that may trim repetitive behavior and lift social talk. Until an RCT appears, use tDCS as an add-on, not a replacement for ABA. Track each client’s data; if you pair brain stimulation with your usual program, you can see whether the extra 20 minutes pay off in real world play and conversation.
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02At a glance
03Original abstract
INTRODUCTION: Autism Spectrum Disorder (ASD) is characterized by persistent difficulties in social communication and behavior regulation. Although behavioral and pharmacological interventions exist, many yield limited improvements in these core areas. Transcranial Direct Current Stimulation (tDCS), a non-invasive neuromodulation technique, has shown potential for enhancing social and cognitive functions in individuals with ASD. This study evaluated the impact of tDCS, applied over the Dorsolateral Prefrontal Cortex (DLPFC), on social communication and behavioral outcomes in children and adolescents with ASD. MATERIALS AND METHODS: Two hundred sixty-five participants (3-18 years) with clinically confirmed ASD diagnoses (including ADOS-2 assessments) received a four-week course of tDCS over the DLPFC. Outcome measures included the Social Responsiveness Scale (SRS-2), the Autism Diagnostic Observation Schedule (ADOS-2), and the Aberrant Behavior Checklist (ABC). Family perceptions were explored through semi-structured interviews. Quantitative data were analyzed using paired t-tests and ANOVA, and qualitative data were examined via thematic analysis. No sham or control group was included. RESULTS: Participants exhibited significant improvements in verbal and non-verbal communication (e.g., vocabulary, eye contact, gesture use), as well as reductions in repetitive behaviors and emotional dysregulation. Families reported decreased parental stress and enhanced family interactions, underscoring the intervention's feasibility and acceptability. CONCLUSION: tDCS over the DLPFC shows promise as an adjunctive intervention to improve social communication and behavioral outcomes in children and adolescents with ASD. However, the absence of a control group and the short duration of follow-up limit causal inferences. Further randomized, controlled, and longitudinal studies are needed to confirm these preliminary findings and determine their long-term clinical relevance.
Research in developmental disabilities, 2025 · doi:10.1016/j.ridd.2025.104958