Related Experiment Video
Updated: Jan 26, 2026
12:21
Probing the Brain in Autism Using fMRI and Diffusion Tensor Imaging
Published on: September 12, 2011
25.7K
Differential GABA dynamics across brain functional networks in autism
Qiyun Huang1,2,3,4, Di Chen5, Andreia C Pereira6,7,8
1School of Future Technology, South China University of Technology, Guangzhou, China. qiyun.huang@kcl.ac.uk.
Communications Biology
|January 24, 2026
Summary
Autism involves an excitatory-inhibitory imbalance affecting brain networks. Arbaclofen, a GABAB agonist, normalized some brain activity in autistic individuals, but responses varied with dose, suggesting altered GABAergic responsivity.
Area of Science:
- Neuroscience
- Autism Spectrum Disorder Research
- Pharmacology
Background:
- Gamma-aminobutyric acid (GABA) system dysfunction is linked to excitatory-inhibitory imbalances in autism, impacting sensory processing.
- The brain's network-level response to GABA pathway interventions in autism is not well understood.
Purpose of the Study:
- To investigate alterations in GABAergic control of information transfer across large-scale brain networks in autism.
- To examine the effects of arbaclofen, a GABAB receptor agonist, on brain functional networks in autistic and non-autistic individuals.
Main Methods:
- Phase-amplitude coupling (PAC) analysis of resting-state electroencephalography (EEG) signals within and between brain networks.
- Double-blind, randomized administration of placebo or 15/30 mg arbaclofen in autistic and non-autistic participants.
Main Results:
- Autistic participants showed significantly higher theta-beta PAC, particularly in the limbic network.
- High-dose arbaclofen normalized PAC in visual and somatomotor networks but had limited impact on higher cognitive networks.
- Low-dose arbaclofen normalized limbic network PAC in autistic individuals, while high-dose administration caused its re-emergence.
Conclusions:
- Findings demonstrate altered GABAergic responsivity in autism, contributing to dose-sensitive and paradoxical medication responses.
- Understanding these network-level GABAergic alterations is crucial for optimizing pharmacological interventions in autism.
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