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First Measurable Molecular Difference Found in Autistic Brains

Autistic adults show about 15% lower mGlu5 receptor availability linked to altered excitatory brain activity measured by EEG, suggesting a molecular basis for autism traits.

  • Researchers found PET evidence showing about 15% lower metabotropic glutamate receptor 5 availability in autistic adults versus neurotypical control adults using tracerFPEB.
  • To investigate the molecular basis of observed excitatory differences, study authors assessed glutamatergic receptor density with PET and linked it to EEG slope as an index of excitatory‑inhibitory balance.
  • In the cerebral cortex, group differences were greatest and lower mGlu5 availability correlated with shallower EEG power‑spectrum slope ; multimethod evidence linked PET and EEG.
  • The study suggests lower brain-wide mGlu5 availability may represent a molecular mechanism underlying altered excitatory neurotransmission and help stratify the heterogeneous autism phenotype.
  • Using rigorous PET quantification, the study measured volume of distribution with equilibrium analysis and applied mixed-model analyses plus Spearman's rho correlations in a multimethod PET + EEG approach.
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thetransmitter.org broke the news in on Tuesday, December 16, 2025.
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