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Language cortex activation in normal children.

A G Wood1, A S Harvey, R M Wellard

  • 1Brain Research Institute, Royal Children's Hospital, Melbourne, Australia. Amanda.Wood@med.monash.edu.au

Neurology
|September 29, 2004
PubMed
Summary
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Functional MRI (fMRI) effectively maps language representation in children and adolescents. Language lateralization is established early, similar to adults, providing crucial pediatric diagnostic data.

Area of Science:

  • Neuroscience
  • Developmental Neuroscience
  • Cognitive Neuroscience

Background:

  • Determining language representation is crucial for pediatric neurological assessments.
  • Functional magnetic resonance imaging (fMRI) offers a non-invasive method for brain activity mapping.

Purpose of the Study:

  • To establish and validate a protocol for assessing language representation in pediatric populations using fMRI.
  • To compare language activation patterns between children and adults.

Main Methods:

  • 130 fMRI studies were conducted in 48 children and 17 adults.
  • Two language tasks were employed: verb generation (VG) and orthographic lexical retrieval (OLR).
  • Activation localization, lateralization, and extent were assessed visually and quantitatively using voxel counts.

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Main Results:

  • Predominantly left-lateralized language activation was observed in both children (85%) and adults (94%).
  • Similar activation sites were noted across age groups, including frontal and temporal cortices.
  • Children showed greater quantitative asymmetry for VG compared to OLR, with reduced frontal activation correlating with task proficiency.

Conclusions:

  • fMRI is a feasible method for language assessment in pediatric patients.
  • Early establishment of language lateralization suggests developmental consistency.
  • Normative fMRI data aid in clinical decisions regarding language laterality in children.