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Related Experiment Videos

Left-hemisphere dysfunction in autism: what are we measuring?

K Sussman1, L Lewandowski

  • 1Syracuse University, NY 13244-2340, USA.

Archives of Clinical Neuropsychology : the Official Journal of the National Academy of Neuropsychologists
|January 1, 1990
PubMed
Summary
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This study examined the left hemisphere deficit hypothesis in autism. Findings indicate autistic youngsters exhibit bilateral brain involvement, with a primary impact on the left hemisphere, challenging previous theories.

Area of Science:

  • Neuroscience
  • Developmental Psychology
  • Autism Research

Background:

  • The left hemisphere deficit hypothesis proposes specific cognitive impairments in autism are linked to left-brain dysfunction.
  • Previous research has yielded mixed results, necessitating further investigation into hemispheric involvement in autism.

Purpose of the Study:

  • To investigate the validity of the left hemisphere deficit hypothesis in a sample of autistic children.
  • To compare neuropsychological functioning in autistic children versus a matched control group.

Main Methods:

  • A cohort of 15 autistic children (ages 8-13) was assessed.
  • A control group of 15 mentally retarded children, matched for age and IQ, underwent similar neuropsychological assessments.
  • Measures were selected for their presumed sensitivity to neuropsychological dysfunction.

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Main Results:

  • The study found evidence of bilateral neuropsychological involvement in the autistic group.
  • Left-hemisphere functioning was predominantly affected, but not exclusively.
  • Results suggest a more complex pattern of brain involvement than previously hypothesized.

Conclusions:

  • The findings challenge a strict left hemisphere deficit model of autism.
  • Autism appears to involve broader, bilateral brain dysfunction, with a significant left-hemisphere component.
  • Methodological considerations, including test selection and sample variability, are crucial in autism neurocognitive research.