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Brain anatomy and sensorimotor gating in Asperger's syndrome.

Grainne M McAlonan1, Eileen Daly, Veena Kumari

  • 1Department of Psychological Medicine, Institute of Psychiatry, London, UK.

Brain : a Journal of Neurology
|June 22, 2002
PubMed
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Individuals with Asperger's syndrome exhibit altered brain development, specifically in fronto-striatal regions, leading to impaired sensorimotor gating and difficulties inhibiting repetitive behaviors. This research highlights key neurobiological differences in this autistic disorder.

Area of Science:

  • Neuroscience
  • Developmental Psychology
  • Psychiatry

Background:

  • Asperger's syndrome, an autistic disorder, involves stereotyped behaviors and social-communication deficits.
  • The neurobiological underpinnings of Asperger's syndrome remain poorly understood, with limited research on brain anatomy.
  • Differences in limbic circuits are increasingly suggested, potentially linked to sensorimotor gating deficits.

Purpose of the Study:

  • To compare brain anatomy and sensorimotor gating in adults with Asperger's syndrome and neurotypical controls.
  • To investigate potential neurobiological correlates of repetitive thoughts and actions in Asperger's syndrome.
  • To explore age-related volumetric changes in brain regions associated with Asperger's syndrome.

Main Methods:

  • Quantitative MRI was used to assess brain anatomy in 21 adults with Asperger's syndrome and 24 controls.

Related Experiment Videos

  • Sensorimotor gating was evaluated using prepulse inhibition of startle in a subset of participants.
  • Participants were adults aged 18-49 years with normal IQ.

    • Main Results:

    • Significant age-related differences in cerebral hemisphere and caudate nucleus volumes were observed.
    • Individuals with Asperger's syndrome showed reduced grey matter in fronto-striatal and cerebellar regions compared to controls.
    • Widespread white matter differences and significantly impaired sensorimotor gating were found in Asperger's syndrome.

    Conclusions:

    • Asperger's syndrome is associated with generalized alterations in brain development and specific anatomical differences in fronto-striatal and cerebellar regions.
    • Defective sensorimotor gating, linked to fronto-striatal pathway abnormalities, may underlie difficulties in inhibiting repetitive behaviors.
    • These findings provide neurobiological insights into the characteristic symptoms of Asperger's syndrome.