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Similarities and differences in behavioral state organization during sleep periods in the perinatal infant before and
L J Groome1, M J Swiber, J L Atterbury
1Department of Obstetrics and Gynecology, University of South Alabama, Mobile 36617, USA. lgroome@jaguar1.usouthal.edu
Insights
Behavioral state organization shows remarkable similarity between fetuses and neonates, with consistent quiet sleep (QS) durations. However, active sleep (AS) control significantly changes post-birth, indicating developmental shifts.
Area of Science:
- Developmental Psychology
- Neuroscience
- Human Development
Background:
- Behavioral state organization is crucial for infant development and well-being.
- Understanding the continuity and changes in behavioral states from fetal to neonatal periods offers insights into early neurodevelopment.
Purpose of the Study:
- To assess the consistency of behavioral state organization in human infants from late gestation to early infancy.
- To identify specific behavioral states that remain stable or undergo significant changes between the fetal and neonatal periods.
Main Methods:
- Behavioral states were assessed in 30 low-risk human participants at 38-40 weeks gestation and again at approximately 2 weeks postnatal age.
- State assignment was based on heart rate patterns, eye movements, and gross body movements.
- Analysis focused on the duration and transitions between different behavioral states, including quiet sleep (QS), active sleep (AS), and indeterminate states.
Main Results:
- Proportions of time spent in QS, AS, and indeterminate states were nearly identical between fetal and neonatal periods.
- The duration of complete QS epochs was the only consistent measure within subjects between fetal and neonatal stages.
- Neonates exhibited shorter and more structured active sleep to quiet sleep transitions compared to fetuses.
Conclusions:
- Central nervous system processes governing quiet sleep (QS) appear stable between the late fetal and early neonatal periods.
- The control mechanisms for active sleep (AS) undergo significant developmental changes during the transition from fetal to neonatal life.
- The duration of complete QS epochs serves as a reliable indicator of behavioral state development across the prenatal and postnatal periods.
Abstract:
The purpose of this study was to determine the degree of consistency in behavioral state organization for 30 low-risk human participants examined as fetuses at 38-40 weeks gestation and again as neonates at approximately 2 weeks postnatal age. Behavioral states were assigned similarly for fetuses and neonates in terms of heart rate pattern and the presence or absence of eye and gross body movements. We found that the time spent in a sleep period was distributed among quiet sleep (QS), active sleep (AS), and indeterminate states in virtually identical proportions for fetuses and neonates. However, the only within-subject consistency between the fetal and neonatal periods was in the duration of complete QS epochs. Fetuses made fewer transitions between QS and AS, but neonates had shorter and more structured AS-->QS transitions. These findings suggest that, whereas central nervous system processes governing QS do not change appreciably, the control of AS undergoes significant changes in the 4 weeks spanning the fetal and neonatal periods. We believe that the duration of enclosed QS epochs provides the only stable measure of behavioral state development between the prenatal and postnatal periods.