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Functional brain imaging using fMRI and optical topography in infancy.

Yukuo Konishi1, Gentaro Taga, Hiroki Yamada

  • 1Department of Infant's Brain and Coginitive Development, Tokyo Women's Medical University School of Medicine, 8-1 Kawada-cho Shinjuku-ku, Tokyo 162-8666, Japan. ykonishi@abmes.twmu.ac.jp

Sleep Medicine
|November 1, 2003
PubMed
Summary

Visual cortex responses in infants change with age. Functional magnetic resonance imaging and optical topography reveal distinct patterns in neonates versus older infants, possibly due to rapid synaptogenesis.

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Area of Science:

  • Neuroscience
  • Developmental Neuroscience
  • Visual Neuroscience

Background:

  • The developing visual cortex undergoes significant changes in early life.
  • Understanding these changes is crucial for assessing visual development and detecting potential abnormalities.

Purpose of the Study:

  • To investigate age-related changes in visual cortex activity and cerebral oxygenation in infants.
  • To explore the maturation of visual processing pathways from neonates to older infants.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) and optical topography (non-invasive near-infrared spectroscopy) were used.
  • Stimulus-related signal changes and spontaneous oscillations in oxy-hemoglobin (oxy-Hb) and deoxy-Hb were analyzed.
  • Two infant age groups (<60 days and >60 days) were studied during sedation and sleep.

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Main Results:

  • Stimulus-related signals were positive in the lateral geniculate nucleus for all infants.
  • A reversal of signal change was observed in the primary visual cortex: positive in younger infants, negative in older infants.
  • Spatially synchronized oscillations in oxy-Hb and deoxy-Hb were present in neonates but not in 1-month-old infants.
  • Oscillation stability and phase lag differed between neonates and 1-month-old infants.

Conclusions:

  • Infant visual cortex function undergoes significant maturation within the first two months of life.
  • Observed changes in visual cortex activity and cerebral oxygenation patterns suggest rapid synaptogenesis.
  • These findings provide insights into the neurodevelopmental trajectory of the human visual system.