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Related Experiment Videos

Brain activation in sedated children: auditory and visual functional MR imaging.

N R Altman1, B Bernal

  • 1Department of Radiology, Miami Children's Hospital, 3100 SW 62nd Ave, Miami, FL 33155, USA. nolan.altman@mch.com

Radiology
|September 25, 2001
PubMed
Summary

Functional magnetic resonance imaging (fMRI) can map brain activation in sedated children using visual and auditory tasks. This study shows visual cortex activation and auditory activation in temporal and frontal lobes.

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Area of Science:

  • Neuroscience
  • Pediatric Imaging
  • Functional Magnetic Resonance Imaging

Background:

  • Assessing brain function in pediatric patients often requires sedation.
  • Functional magnetic resonance imaging (fMRI) is a valuable tool for non-invasive brain activity mapping.

Purpose of the Study:

  • To map developing brain activation areas in sedated children using passive auditory and visual stimuli.
  • To investigate age-related differences in brain activation patterns.

Main Methods:

  • Forty children (2 months to 9 years) underwent fMRI with passive visual (flashing lights) and auditory (recorded voice) tasks.
  • Children received sedation (pentobarbital or chloral hydrate).
  • Activation maps were generated using a paired t test (P < .0005).

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Main Results:

  • Visual stimulus activated the rostral primary visual cortex in 90% of patients, showing negative values.
  • Auditory paradigm activated temporal or frontal areas in 68% of patients.
  • Increased frontal activation was observed in older children.

Conclusions:

  • Sedated children demonstrate activation in visual and auditory cortices via fMRI.
  • Visual cortex responses are consistently negative in the rostral region, irrespective of age.
  • Auditory activation occurs in both temporal and frontal lobes, with a trend towards more frontal involvement in older children.