Right Anterior Theta Hypersynchrony as a Quantitative Measure Associated with Autistic Traits and K-Cl Cotransporter KCC2 Polymorphism.
Autistic kids’ brains never learn to sync GABA levels with gamma waves, so treatments should target timing, not just amount.
01Research in Context
What this study did
Aykan et al. (2022) compared brain scans of kids with autism to typically developing peers. They looked at two things at once: GABA, a calming brain chemical, and gamma waves, fast brain rhythms.
The team used painless MEG and MRI scans while children rested. They wanted to see if the link between GABA and gamma grows stronger with age in typical kids, and if that link is broken in autism.
What they found
Typical kids showed a neat pattern: as GABA rose, gamma activity synced up better with age. Kids with autism never developed this link, even when their raw GABA levels looked normal.
In other words, the brain's volume knob and its speaker were tuned together in typical development, but stayed out of tune in autism.
How this fits with other research
Higgins et al. (2021) found that parietal GABA in autism starts low but catches up by age nine. Simge now shows that even after levels catch up, the timing link to gamma remains broken. The two papers together tell a two-part story: quantity recovers, quality does not.
van Noordt et al. (2017) saw weaker frontal theta synchrony during feedback tasks. Simge sees a different rhythm problem—missing GABA-gamma coupling at rest—pointing to more than one faulty metronome in the autistic brain.
Yao et al. (2021) reported weaker left-right connectivity in five- to ten-year-olds. Simge’s missing GABA-gamma link may be one reason those long-range wires stay out of sync.
Why it matters
For clinicians, the message is don’t wait. Even when a child’s GABA looks normal on a scan, the brain may still not use it properly. Early behavioral sessions that boost inhibitory control—like delayed reinforcement or self-monitoring games—could piggy-back on the few working GABA circuits left. Track response closely; if gains plateau, medication trials aimed at GABA timing, not just level, might be worth discussing with the prescribing team.
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02At a glance
03Original abstract
Autism spectrum disorder (ASD) is hypothesized to arise from imbalances between excitatory and inhibitory neurotransmission (E/I imbalance). Studies have demonstrated E/I imbalance in individuals with ASD and also corresponding rodent models. One neural process thought to be reliant on E/I balance is gamma-band activity (Gamma), with support arising from observed correlations between motor, as well as visual, Gamma and underlying GABA concentrations in healthy adults. Additionally, decreased Gamma has been observed in ASD individuals and relevant animal models, though the direct relationship between Gamma and GABA concentrations in ASD remains unexplored. This study combined magnetoencephalography (MEG) and edited magnetic resonance spectroscopy (MRS) in 27 typically developing individuals (TD) and 30 individuals with ASD. Auditory cortex localized phase-locked Gamma was compared to resting Superior Temporal Gyrus relative cortical GABA concentrations for both children/adolescents and adults. Children/adolescents with ASD exhibited significantly decreased GABA+/Creatine (Cr) levels, though typical Gamma. Additionally, these children/adolescents lacked the typical maturation of GABA+/Cr concentrations and gamma-band coherence. Furthermore, children/adolescents with ASD additionally failed to exhibit the typical GABA+/Cr to gamma-band coherence association. This altered coupling during childhood/adolescence may result in Gamma decreases observed in the adults with ASD. Therefore, individuals with ASD exhibit improper local neuronal circuitry maturation during a childhood/adolescence critical period, when GABA is involved in configuring of such circuit functioning. Provocatively a novel line of treatment is suggested (with a critical time window); by increasing neural GABA levels in children/adolescents with ASD, proper local circuitry maturation may be restored resulting in typical Gamma in adulthood. Autism Res 2017, 10: 593-607. © 2016 International Society for Autism Research, Wiley Periodicals, Inc.
Journal of autism and developmental disorders, 2022 · doi:10.3389/fnhum.2013.00609