Abstract
Whether brain stimulation could modulate brain structure in autism remains unknown. This study explored the impact of continuous theta burst stimulation (cTBS) over the left dorsolateral prefrontal cortex (DLPFC) on white matter macro/microstructure in intellectually able children and emerging adults with autism. Sixty autistic participants were randomized (30 active) and received active or sham cTBS for eight weeks twice per week, 16 total sessions using a double-blind (participant-, rater-, analyst-blinded) design. All participants received high-angular resolution diffusion MR imaging at baseline and week 8. Twenty-eight participants in the active group and twenty-seven in the sham group with good imaging quality entered the final analysis. With longitudinal fixel-based analysis and network-based statistics, we found no significant difference between the active and sham groups in changes of white matter macro/microstructure and connections following cTBS. In addition, we found no association between baseline white matter macro/microstructure and autistic symptom changes from baseline to week 8 in the active group. In conclusion, we did not find a significant impact of left DLPFC cTBS on white matter macro/microstructure and connections in children and emerging adults with autism. These findings need to be interpreted in the context that the current intellectually able cohort in a single university hospital site limits the generalizability. Future studies are required to investigate if higher stimulation intensities and/or doses, other personal factors, or rTMS parameters might confer significant brain structural changes visible on MRI in ASD.
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Data availability
The datasets generated during and/or analyzed during the current study are available from the corresponding author upon reasonable request.
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Acknowledgements
The authors would like to thank all of our participants and their family members for partaking in this study and the anonymous reviewers for comments that significantly improved the manuscript. We want to pay tribute to the late Professor Ying-Zu Huang, who guided and inspired this study with wisdom, insight, and tenacity.
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This work is supported by grants from the Ministry of Science and Technology of Taiwan (108–2628-B-182A-006-; 109–2628-B-182A-010-; 110–2628-B-182A-016-; 112–2221-E-182–029). Hsiang-Yuan Lin is supported by the Azrieli Adult Neurodevelopmental Centre at Centre for Addiction and Mental Health, and an Academic Scholar Award from the Department of Psychiatry, University of Toronto. The funders had no role in the study's design, in the collection, analyses, or interpretation of data, in the writing of the manuscript, or in the decision to publish the results.
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All authors read and approved the final manuscript. Conceptualization and design: Hsing-Chang Ni, Hsiang-Yuan Lin; Methodology: Yi-Ping Chao, Chen-Te Wu, Rou-Shayn Chen, Chun-Hung Yeh; Clinical data collection: Hsing-Chang Ni; Neuroimaging data collection: Hsing-Chang Ni, Yi-Ping Chao, Chen-Te Wu; Formal analysis: Hsiang-Chang Ni, Rung-Yu Tseng, Chun-Hung Yeh, Hsiang-Yuan Lin; Interpretation: Hsiang-Chang Ni, Po-Chun Lin, Chun-Hung Yeh, and Hsiang-Yuan Lin; Writing—original draft preparation: Hsiang-Chang Ni, Po-Chun Lin, Chun-Hung Yeh, and Hsiang-Yuan Lin; Figures: Hsiang-Chang Ni, Rung-Yu Tseng, Chun-Hung Yeh; Writing—review and editing: All authors; Funding acquisition: Hsing-Chang Ni; Resources: Tai-Li Chou and Susan Shur-Fen Gau; Supervision: Hsiang-Yuan Lin.
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Yeh, CH., Lin, PC., Tseng, RY. et al. Lack of effects of eight-week left dorsolateral prefrontal theta burst stimulation on white matter macro/microstructure and connection in autism. Brain Imaging and Behavior (2024). https://doi.org/10.1007/s11682-024-00874-x
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DOI: https://doi.org/10.1007/s11682-024-00874-x