Extrauterine environment influences spontaneous low-frequency oscillations in the preterm brain
Related Experiment Video
Updated: May 22, 2026
Preterm EEG: A Multimodal Neurophysiological Protocol
Published on: February 18, 2012
Ikuko Kato1, Takashi Kusaka, Tomoko Nishida
1Department of Pediatrics, Faculty of Medicine, Kagawa University, Kagawa, Japan.
Insights
Preterm infants show distinct resting-state cerebral blood flow oscillations compared to term infants. This suggests the extrauterine environment impacts circulatory and nerve development in preterm babies.
Area of Science:
- Neuroscience
- Developmental Biology
- Medical Imaging
Background:
- Low-frequency cerebral blood flow oscillations indicate resting-state brain activity.
- Previous research has not explored resting-state brain activity development in preterm infants.
Purpose of the Study:
- To measure and compare cerebral blood flow oscillations in preterm and term infants.
- To investigate resting-state brain function development in relation to gestational age.
Main Methods:
- Near-infrared spectroscopy (NIRS) measured changes in oxyhemoglobin and deoxyhemoglobin concentrations.
- Analysis of power spectral densities (PSD) of cerebral blood flow oscillations during quiet sleep.
- Comparison between 9 preterm infants (postconceptional age 37-46 weeks) and 10 term infants (postconceptional age 37-41 weeks).
Main Results:
- Preterm infants exhibited a higher proportion of low-frequency (0.06-0.10 Hz) oscillations in oxyhemoglobin and deoxyhemoglobin.
- A significant inverse correlation was found between gestational age and the proportion of low-frequency oscillations.
- Cerebral blood flow oscillation patterns differed notably between preterm and term infants.
Conclusions:
- Resting-state cerebral blood flow oscillations are different in preterm versus term infants.
- The extrauterine environment appears to influence the development of circulatory regulation and nerve activity in preterm infants.
- Findings highlight developmental differences in brain function regulation in preterm neonates.
Abstract:
Low-frequency oscillations in cerebral blood flow that are suggestive of resting-state brain activity have recently been reported, but no study on the development of resting-state brain activity in preterm infants has been performed. The objective of this study was to measure the cerebral blood flow oscillations, which are assumed to represent brain function in the resting state, in preterm and term infants of the same postconceptional age. The subjects were 9 preterm infants who had reached full term (gestational age (GA): 23-34 weeks, postconceptional age: 37-46 weeks) and 10 term infants (GA: 37-40 weeks, postconceptional age: 37-41 weeks). Their changes in concentration of oxyhemoglobin ([oxyHb]) and deoxyhemoglobin ([deoxyHb]) were measured in the parieto-temporal region during quiet sleep using multi-channel near-infrared spectroscopy, and the power spectral densities (PSD) of the oscillations in the concentrations of these molecules were analyzed and compared. The preterm infants displayed a higher proportion of 0.06-0.10 Hz low frequency oscillations of [oxyHb] and [deoxyHb] than the term infants, and the gestational age and the proportion of low frequency oscillations were inversely correlated. These findings suggest that resting-state cerebral blood flow oscillations differ between preterm and term infants, and that the development of circulatory regulation and nerve activity in preterm infants are influenced by the extrauterine environment.
