This study explores a safe and effective new approach to improve language function in children with Global Developmental Delay (GDD). Conducted at Xiangxi Autonomous Prefecture People's Hospital, the study will recruit approximately 50 children aged 2 to 5 years. Participants will be randomly assigned to one of two groups: one receiving personalized language training combined with non-invasive, painless repetitive Transcranial Magnetic Stimulation (rTMS) to activate language regions of the brain, and a control group receiving personalized training for comparative analysis. The study spans one month, including a two-week intervention period followed by a two-week follow-up to evaluate the efficacy and sustainability of the combined therapy. This study has been rigorously reviewed and approved by the hospital's Ethics Committee.
Children aged 2-5 years old, regardless of gender.
Meet the diagnostic definition of GDD in China's Diagnostic Guidelines for Global Developmental Delay (2024), confirmed by Gesell Developmental Schedules (GDS). Language domain Developmental Quotient (DQ) ≤ 75. A DQ ≤ 75 is found in at least one of the four developmental domains: gross motor, fine motor, adaptive behavior, and personal-social conduct. Mild-moderate GDD is selected for the study.
The presence of significant language developmental delay, the language ability is significantly lower than children of the same age and the same intellectual level, confirmed by the standardized scale of Sign-Significate Relations (S-S) assessment.
The child is able to cooperate with the completion of rTMS treatment and language assessment and has no serious behavioral problems.
None
Parallel
Transcranial magnetic stimulation
BehavioralThe stimulation protocol consists of the following parameters: frequency of 10 Hz, intensity at 80% of the resting motor threshold (RMT), 30 pulses per train, 3-second train duration, and a 17-second inter-train interval. Each session comprises 1800 pulses in total, lasting 20 minutes. In addition to language training, participants will receive High-Frequency rTMS as a group-specific intervention. The rTMS will be administered 5 minutes prior to each language training session to leverage the post-stimulation "time window" and potentially enhance training efficacy. The entire study will last approximately 1 months, including 2 weeks of treatment and 2 weeks of follow-up.
individualized language training
Behavioralindividualized language training
Change from Baseline in Language Developmental Quotient (DQ) via Gesell Developmental Schedules
The language subscale of the Gesell Developmental Schedules is used to evaluate a child's language development. The result is expressed as a Developmental Quotient (DQ), a continuous score where 100 represents performance at the exact chronological age level. A higher DQ indicates better language abilities.
Change from Baseline in Language Developmental Stage via Sign-Significate Relations (S-S) Assessment
The S-S method is a standardized tool for the detailed diagnosis and classification of language developmental delay in children. It assesses both language comprehension and expression abilities, assigning the child to a specific developmental stage.The core outcome is the assigned Stage (I to V, with subdivisions). Higher stages indicate more advanced language development. For analysis, stages are often converted to an ordinal numerical score (e.g., Stage I=1, Stage II=2, etc.). The minimum score is 1 (lowest stage), and the maximum is 5 (highest stage).
Number of Participants with the Systematic Assessment for Treatment of Emergent Events (SAFTEE) [Safety and Tolerability]
Safety will be assessed by recording the incidence and severity of all adverse events (AEs) reported during the study. AEs include but are not limited to: headache, dizziness, scalp discomfort, tinnitus, irritability, and seizures. Severity will be graded as mild, moderate, or severe.
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Xiangya Hospital of Central South University
Lead sponsor
Xiangxi Autonomous Prefecture People's Hospital
Collaborator
