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Neonatal auditory activation detected by functional magnetic resonance imaging
A W Anderson1, R Marois, E R Colson
1Department of Diagnostic Radiology, Yale University School of Medicine, New Haven, CT, USA.
Magnetic Resonance Imaging
|April 11, 2001
Summary
Functional magnetic resonance imaging (fMRI) detected auditory brain activation in non-sedated newborns. While adults showed signal increases, many infants exhibited signal decreases, suggesting developmental differences in auditory processing.
Area of Science:
- Neuroscience
- Developmental Neuroscience
- Auditory Neuroscience
Background:
- Auditory cortical activation is crucial for infant development.
- Assessing brain function in non-sedated neonates presents significant challenges.
- Functional magnetic resonance imaging (fMRI) offers a non-invasive method to study infant brain activity.
Purpose of the Study:
- To detect auditory cortical activation in non-sedated neonates using fMRI.
- To compare auditory processing between neonates and adult controls.
- To investigate the BOLD signal response to auditory stimuli in early development.
Main Methods:
- Utilized echo-planar functional brain imaging to map Blood Oxygen Level-Dependent (BOLD) signal.
- Presented a frequency-modulated pure tone auditory stimulus.
- Analyzed brain activation in 5 mm-thick slices parallel to the superior temporal gyrus in 20 neonates and 4 adults.
Main Results:
- Auditory stimulation elicited detectable BOLD signal responses in 4/4 adults and 14/20 neonates.
- Adults showed increased BOLD signal in superior temporal regions.
- A significant proportion of neonates (9/14) displayed decreased BOLD signal during auditory stimulation.
Conclusions:
- fMRI is a viable technique for detecting auditory brain activation in human infants.
- Neonatal auditory cortical responses differ from those in adults, potentially reflecting developmental maturation.
- Further research is needed to understand the implications of decreased BOLD signal in neonates.
