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Functional MRI of global and local processing in children.

Pamela Moses1, Katherine Roe, Richard B Buxton

  • 1Department of Cognitive Science, University of California of San Diego, La Jolla, California 92093, USA.

Neuroimage
|May 29, 2002
PubMed
Summary
This summary is machine-generated.

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Children

Area of Science:

  • Neuroscience
  • Developmental Psychology
  • Cognitive Science

Background:

  • Previous reaction time (RT) studies show emerging hemispheric differences in children's visual processing of hierarchical forms.
  • Children aged 7-14 initially show slower local element analysis without strong lateralization, developing a left hemisphere advantage for local and right for global processing with age.

Purpose of the Study:

  • To investigate if developmental changes in cognitive measures of visual processing correspond to changes in functional brain activation patterns.
  • To examine hemispheric biases in processing global versus local visual information in children using functional magnetic resonance imaging (fMRI).

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was used on 20 children (12-14 years old) during attend-global and attend-local tasks.

Related Experiment Videos

  • Children were grouped into immature-bilateral (IB) or mature-lateralized (ML) based on prior RT performance.
  • Task-related activation in lateral temporo-occipital regions was compared between groups and conditions.

    • Main Results:

    • Immature-bilateral (IB) children showed greater overall activation for local processing and comparable bilateral activation for global processing.
    • Mature-lateralized (ML) children exhibited right hemisphere dominance for global analysis and left hemisphere dominance for local analysis.
    • fMRI activation patterns directly mirrored the RT performance profiles observed in both groups.

    Conclusions:

    • The study demonstrates a developmental shift in visual processing from undifferentiated, bilateral activation towards specialized hemispheric lateralization.
    • Functional brain activation patterns in children directly reflect their cognitive performance in processing global and local visual information.