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Improving social cognition following theta burst stimulation over the right inferior frontal gyrus in autism spectrum: an 8-week double-blind sham-controlled trial

Published online by Cambridge University Press:  06 September 2024

Hsing-Chang Ni*
Affiliation:
Department of Psychiatry, Chang Gung Memorial Hospital at Linkou, Taoyuan, Taiwan College of Medicine, Chang Gung University, Taoyuan, Taiwan
Yi-Lung Chen
Affiliation:
Department of Healthcare Administration, Asia University, Taichung, Taiwan Department of Psychology, Asia University, Taichung, Taiwan
Meng-Ying Hsieh
Affiliation:
Deparment of Pediatrics, Chang Gung Memorial Hospital at Taipei, Taipei, Taiwan Department of Pediatric Neurology, Chang Gung Memorial Hospital at Linkou, Taoyuan, Taiwan
Chen-Te Wu
Affiliation:
Department of Medical Imaging and Intervention, Chang Gung Memorial Hospital at Linkou, Taoyuan, Taiwan
Rou-Shayn Chen
Affiliation:
Department of Neurology, Chang Gung Memorial Hospital at Linkou, Taoyuan, Taiwan
Chi-Hung Juan
Affiliation:
Institue of Cognitive Neuroscience, National Central University, Jhongli, Taiwan
Cheng-Ta Li
Affiliation:
Department of Psychiatry, Taipei Veterans General Hospital, Taipei, Taiwan
Susan Shur-Fen Gau
Affiliation:
Graduate Institute of Brain and Mind Sciences, College of Medicine, National Taiwan University, Taipei, Taiwan Neurobiology and Cognitive Science Center, National Taiwan University, Taipei, Taiwan Department of Psychiatry, National Taiwan University Hospital and College of Medicine, Taipei, Taiwan
Hsiang-Yuan Lin*
Affiliation:
Azrieli Adult Neurodevelopmental Centre, Campbell Family Mental Health Research Institute, Centre for Addiction and Mental Health, Toronto, Ontario, Canada Department of Psychiatry, Temerty Faculty of Medicine, University of Toronto, Toronto, Ontario, Canada
*
Corresponding author: Hsing-Chang Ni; Email: alanni@cgmh.org.tw; alanni0918@yahoo.com.tw; Hsiang-Yuan Lin; Email: Hsiang-Yuan.Lin@camh.ca; hsiangyuan.lin@utoronto.ca
Corresponding author: Hsing-Chang Ni; Email: alanni@cgmh.org.tw; alanni0918@yahoo.com.tw; Hsiang-Yuan Lin; Email: Hsiang-Yuan.Lin@camh.ca; hsiangyuan.lin@utoronto.ca

Abstract

Background

The right inferior frontal gyrus (RIFG) is a potential beneficial brain stimulation target for autism. This randomized, double-blind, two-arm, parallel-group, sham-controlled clinical trial assessed the efficacy of intermittent theta burst stimulation (iTBS) over the RIFG in reducing autistic symptoms (NCT04987749).

Methods

Conducted at a single medical center, the trial enrolled 60 intellectually able autistic individuals (aged 8–30 years; 30 active iTBS). The intervention comprised 16 sessions (two stimulations per week for eight weeks) of neuro-navigated iTBS or sham over the RIFG. Fifty-seven participants (28 active) completed the intervention and assessments at Week 8 (the primary endpoint) and follow-up at Week 12.

Results

Autistic symptoms (primary outcome) based on the Social Responsiveness Scale decreased in both groups (significant time effect), but there was no significant difference between groups (null time-by-treatment interaction). Likewise, there was no significant between-group difference in changes in repetitive behaviors and exploratory outcomes of adaptive function and emotion dysregulation. Changes in social cognition (secondary outcome) differed between groups in feeling scores on the Frith-Happe Animations (Week 8, p = 0.026; Week 12, p = 0.025). Post-hoc analysis showed that the active group improved better on this social cognition than the sham group. Dropout rates did not vary between groups; the most common adverse event in both groups was local pain. Notably, our findings would not survive stringent multiple comparison corrections.

Conclusions

Our findings suggest that iTBS over the RIFG is not different from sham in reducing autistic symptoms and emotion dysregulation. Nonetheless, RIFG iTBS may improve social cognition of mentalizing others' feelings in autistic individuals.

Information

Type
Original Article
Copyright
Copyright © The Author(s), 2024. Published by Cambridge University Press

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