Reduced GABA and altered somatosensory function in children with autism spectrum disorder.
Kids with autism have less GABA in the touch cortex, and the shortfall tracks with tactile inhibition problems.
01Research in Context
What this study did
The team used brain scans to measure GABA in the sensorimotor cortex of children with autism. They also gave the kids a quick touch test to see how well they blocked extra touch signals.
Kids with autism were compared to same-age peers without autism.
What they found
Children with autism had lower GABA in the touch area of the brain. Lower GABA matched poorer scores on the touch-blocking task.
The result points to a clear link: less brain inhibition, more tactile trouble.
How this fits with other research
Sapey-Triomphe et al. (2019) saw the same GABA-drop in adults with autism, so the pattern lasts past childhood.
Yet two child studies seem to clash. Song et al. (2024) found no GABA difference across four brain areas, and Fahmie et al. (2013) saw normal cortical inhibition in young adults. The gap likely comes from where and how GABA was checked: the target zoomed in on the sensorimotor strip, while the others sampled wider or used different tasks.
Maier et al. (2022) flips the direction in adults, showing higher GABA in the prefrontal cortex. Together the papers say GABA changes in autism are spot-specific, not brain-wide.
Why it matters
You now have a concrete brain reason for tactile sensitivity in many kids with autism. When a child pulls away from light touch, think GABA, not just behavior. Watch for new interventions that aim to boost sensorimotor inhibition; they may soon move from lab to clinic.
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02At a glance
03Original abstract
BACKGROUND: Abnormal responses to tactile stimuli are a common feature of autism spectrum disorder (ASD). Several lines of evidence suggest that GABAergic function, which has a crucial role in tactile processing, is altered in ASD. In this study, we determine whether in vivo GABA levels are altered in children with ASD, and whether alterations in GABA levels are associated with abnormal tactile function in these children. METHODS: GABA-edited magnetic resonance spectroscopy was acquired in 37 children with Autism and 35 typically developing children (TDC) from voxels over primary sensorimotor and occipital cortices. Children performed tactile tasks previously shown to be altered in ASD, linked to inhibitory mechanisms. Detection threshold was measured with- and without the presence of a slowly increasing sub-threshold stimulus. Amplitude discrimination was measured with- and without the presence of an adapting stimulus, and frequency discrimination was measured. RESULTS: Sensorimotor GABA levels were significantly reduced in children with autism compared to healthy controls. Occipital GABA levels were normal. Sensorimotor GABA levels correlated with dynamic detection threshold as well as with the effect of sub-threshold stimulation. Sensorimotor GABA levels also correlated with amplitude discrimination after adaptation (an effect absent in autism) and frequency discrimination in controls, but not in children with autism. CONCLUSIONS: GABA levels correlate with behavioral measures of inhibition. Children with autism have reduced GABA, associated with abnormalities in tactile performance. We show here that altered in vivo GABA levels might predict abnormal tactile information processing in ASD and that the GABA system may be a future target for therapies. Autism Res 2016. © 2016 International Society for Autism Research, Wiley Periodicals, Inc.
Autism research : official journal of the International Society for Autism Research, 2017 · doi:10.1002/aur.1691