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Autism Spectrum Disorder01:19

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Autism spectrum disorder (ASD) is a neurodevelopmental condition marked by persistent deficits in social communication and interaction alongside restrictive and repetitive behaviors or interests. ASD is sometimes accompanied by intellectual impairment.
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The cerebellum, while traditionally associated with motor control, also plays a crucial role in memory, particularly in procedural memory, which involves learning motor tasks that become automatic through repetition. For example, studies have shown that when the cerebellum is damaged, individuals or animals lose the ability to learn conditioned motor responses, such as the conditioned eye-blink response in classical conditioning experiments with rabbits. This study demonstrates the...
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Cerebellar Atypicalities in Autism?

Charles Laidi1, Dorothea L Floris2, Julian Tillmann3

  • 1Department of Translational Neuro-Psychiatry, Université Paris Est Créteil, Institut National de la Santé et de la Recherche Médicale U955, Créteil, France; Fondation FondaMental, Créteil, France; Département Médico-Universitaire de Psychiatrie et d'Addictologie, Fédération Hospitalo-Universitaire de Médecine de Précision en Psychiatrie, Assistance Publique-Hôpitaux de Paris, Hôpitaux Universitaires Henri Mondor, Créteil, France; Neurospin, CEA, Paris-Saclay University, Gif-sur-Yvette; Center for the Developing Brain, Child Mind Institute, New York, New York.

Biological Psychiatry
|September 22, 2022
PubMed
Summary
This summary is machine-generated.

This study found no significant differences in cerebellar anatomy between individuals with autism and control groups. These findings suggest no striking cerebellar differences in autism, regardless of age, IQ, sex, or social functioning.

Keywords:
AutismCerebellumMRINormative modelingParcellationVolumetry

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Area of Science:

  • Neuroscience
  • Autism Spectrum Disorder Research
  • Brain Anatomy and Function

Background:

  • The cerebellum, rich in neurons, plays a role in social cognition.
  • Previous studies reported inconsistent cerebellar anatomical differences in autism, possibly due to limited statistical power and sample heterogeneity.
  • Understanding cerebellar anatomy and its diversity in autism remains crucial.

Purpose of the Study:

  • To investigate cerebellar gray matter morphology in a large, multicenter European cohort of individuals with autism.
  • To explore the diversity of cerebellar anatomy within the autism population.
  • To examine potential relationships between cerebellar anatomy and clinical factors like age, IQ, sex, and social functioning.

Main Methods:

  • Utilized voxel-based morphometry and lobular parcellation of the cerebellum in 274 individuals with autism and 219 controls (EU-AIMS LEAP cohort).
  • Employed linear, multivariate (including normative modeling), and meta-analytic statistical approaches for robust analysis.
  • Conducted dimensional analysis in an independent cohort of 352 individuals with autism-related symptoms.

Main Results:

  • No significant differences in cerebellar gray matter morphology were detected between individuals with autism and control subjects using linear models.
  • Normative modeling revealed no significant deviations in cerebellar structure in the autism group.
  • Cerebellar atypicalities did not correlate with age, IQ, sex, or social functioning in individuals with autism.

Conclusions:

  • Contrary to some previous smaller studies, this large-scale investigation found no evidence of striking cerebellar anatomical differences in individuals with autism.
  • The findings highlight the importance of large, diverse cohorts in autism research to avoid spurious results.
  • Further research may focus on other brain regions or functional aspects of autism.