Cerebellar gray matter differentiates children with early language delay in autism.
Less gray matter in cerebellar Crus I/II may flag early language delay inside autism.
01Research in Context
What this study did
Eussen et al. (2016) scanned autistic and neurotypical children. They looked at gray matter volume in the cerebellum. The goal was to see if kids with early language delay had a different brain signature than kids without delay or typical kids.
What they found
Kids with autism plus early language delay had less gray matter in bilateral cerebellar Crus I/II. Kids with autism but no early delay did not show this loss. The gap was big enough to act like a marker for language delay within autism.
How this fits with other research
Li et al. (2022) pooled 33 imaging studies and found weaker white-matter language tracts in autistic kids, especially on the left side. Eussen et al. (2016) adds gray-matter loss in the cerebellum as another brain clue.
Hanaie et al. (2016) used the same VBM method in the same year. They saw less white matter in brainstem and parietal areas linked to motor problems. Together, the two papers show that different cerebellar tissue types track different challenges: gray for language delay, white for motor skills.
Thurm et al. (2007) showed that low joint attention and imitation at age 2-3 forecast minimal language by age 5. Eussen et al. (2016) gives a possible brain reason: those behavioral signs may reflect cerebellar Crus I/II changes.
Why it matters
You now have a brain marker to flag language delay within autism. If a child shows low joint attention and poor imitation, and MRI notes low Crus I/II volume, start language therapy fast. No MRI? Use the behavioral red flags alone, but know the cerebellum is likely involved.
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02At a glance
03Original abstract
Early language delay (ELD) is one of the earliest indicators of autism spectrum disorder (ASD), and predicts later cognitive and behavioral outcomes. We aimed to determine the neural correlates of ELD in autism, and examine the relationships between gray matter (GM), age of first word/phrase, and core ASD symptoms. We used voxel-based morphometry to examine whole-brain differences in GM in 8-13 year old children with autism (n = 13 ELD; n = 22 non-ELD) and 35 age-matched typically developing (TD) children. Multiple regression analyses examined the relationships between GM, age of first word/phrase, and autism diagnostic observation schedule (ADOS) scores. Composite age of first word/phrase negatively correlated with GM throughout the cerebellum. Both ASD groups (ELD and non-ELD) had reduced GM in right cerebellar Crus I/II when compared to TD children. Left cerebellar Crus I/II was the only region in the brain that differentiated ELD and non-ELD children, with ELD children showing reduced GM relative to both non-ELD and TD groups. Group×score interactions converged in left Crus I/II, such that the non-ELD group showed poorer ADOS scores with increasing GM, whereas the ELD group showed poorer ADOS scores as GM decreased. Reduced GM in right cerebellar Crus I/I was related ASD diagnosis, while children with ELD showed additional reduced GM in left Crus I/II. These findings highlight the importance of specific cerebellar networks in both ASD and early language development, and suggest that bilateral disruption in cerebellar regions that interconnect with fronto-parietal networks could impact language acquisition in ASD. Autism Res 2016, 9: 1191-1204. © 2016 International Society for Autism Research, Wiley Periodicals, Inc.
Autism research : official journal of the International Society for Autism Research, 2016 · doi:10.1002/aur.1622