Biochemistry of the cingulate cortex in autism: An MR spectroscopy study.
Adults with autism show distinct chemical signatures in cingulate cortex that earlier studies missed by looking only at kids or tissue slices.
01Research in Context
What this study did
Libero et al. (2016) scanned high-functioning adults with autism and matched controls. They used MR spectroscopy to measure brain chemicals in two cingulate spots: the posterior part (PCC) and the dorsal anterior part (dACC).
No trials, no meds—just a snapshot of biochemistry inside living brain tissue.
What they found
Adults with autism had more choline in the PCC and a lower NAA/Cr ratio in the dACC. These shifts hint at different cell-membrane activity and energy use in these regions.
The results were mixed: one chemical up, one ratio down, both areas affected differently.
How this fits with other research
Matson et al. (2011) first showed the PCC looks disorganized under the microscope in autism. E et al. now add that the same spot also shows chemical change, linking structure to metabolism.
Spriggs et al. (2015) found higher GFAP—a sign of busy support cells—in nearby anterior cingulate white matter. The new data extend that story by showing altered energy markers in the gray matter next door.
Higgins et al. (2021) seems to disagree: they saw low GABA in young kids that normalized by age nine. The clash clears up when you notice E et al. tested adults; brain chemistry in autism can shift with age, so adult and child findings aren’t rivals—they’re chapters in the same book.
Why it matters
You can’t see these chemical tweaks on a standard MRI, but they may underlie the social-cognitive quirks you target in session. If an adult client hits a plateau, remember their cingulate might be running on a different fuel mix; pacing or refining interventions could help.
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02At a glance
03Original abstract
Neuroimaging studies have uncovered structural and functional alterations in the cingulate cortex in individuals with autism spectrum disorders (ASD). Such abnormalities may underlie neurochemical imbalance. In order to characterize the neurochemical profile, the current study examined the concentration of brain metabolites in dorsal ACC (dACC) and posterior cingulate cortex (PCC) in high-functioning adults with ASD. Twenty high-functioning adults with ASD and 20 age-and-IQ-matched typically developing (TD) peers participated in this Proton magnetic resonance spectroscopy (1H-MRS) study. LCModel was used in analyzing the spectra to measure the levels of N-Acetyl aspartate (NAA), choline (Cho), creatine (Cr), and glutamate/glutamine (Glx) in dACC and PCC. Groups were compared using means for the ratio of each metabolite to their respective Cr levels as well as on absolute internal-water-referenced measures of each metabolite. There was a significant increase in Cho in PCC for ASD adults, with a marginal increase in dACC. A reduction in NAA/Cr in dACC was found in ASD participants, compared to their TD peers. No significant differences in Glx/Cr or Cho/Cr were found in dACC. There were no statistically significant group differences in the absolute concentration of NAA, Cr, Glx, or NAA/Cr, Cho/Cr, and Glx/Cr in the PCC. Differences in the metabolic properties of dACC compared to PCC were also found. Results of this study provide evidence for possible cellular and metabolic differences in the dACC and PCC in adults with ASD. This may suggest neuronal dysfunction in these regions and may contribute to the neuropathology of ASD. Autism Res 2016, 9: 643-657. © 2015 International Society for Autism Research, Wiley Periodicals, Inc.
Autism research : official journal of the International Society for Autism Research, 2016 · doi:10.1016/j.brainres.2009.11.057