4.3 Article

Rightward hemispheric asymmetries in auditory language cortex in children with autistic disorder: an MRI investigation

期刊

JOURNAL OF NEURODEVELOPMENTAL DISORDERS
卷 1, 期 3, 页码 205-214

出版社

SPRINGER
DOI: 10.1007/s11689-009-9010-2

关键词

Auditory cortex; Developmental disorder; Heschl's gyrus; Language cortex; Posterior superior temporal gyrus

资金

  1. National Institutes of Health [PO1HD 35458]
  2. The National Alliance for Autism Research [177]

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Purpose: determine if language disorder in children with autistic disorder (AD) corresponds to abnormalities in hemispheric asymmetries in auditory language cortex. Methods: MRI morphometric study in children with AD (n=50) to assess hemispheric asymmetries in auditory language cortex. A key region of interest was the planum temporale (PT), which is larger in the left hemisphere in most healthy individuals. Results: (i) Heschl's gyrus and planum polare showed typical hemisphere asymmetry patterns; (ii) posterior Superior Temporal Gyrus (pSTG) showed significant rightward asymmetry; and (iii) PT showed a trend for rightward asymmetry that was significant when constrained to right-handed boys (n=30). For right-handed boys, symmetry indices for pSTG were significantly positively correlated with those for PT. PT asymmetry was age dependent, with greater rightward asymmetry with age. Conclusions: results provide evidence for rightward asymmetry in auditory association areas (pSTG and PT) known to subserve language processing. Cumulatively, our data provide evidence for a differing maturational path for PT for lower functioning children with AD, with both pre- and post-natal experience likely playing a role in PT asymmetry.

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