Related Experiment Video

Updated: Aug 18, 2026

Preterm EEG: A Multimodal Neurophysiological Protocol
19:32

Preterm EEG: A Multimodal Neurophysiological Protocol

Published on: February 18, 2012

Distribution of sleep and wakefulness EEG patterns in 24-h recordings of preterm and full-term newborns

E Biagioni1, A Boldrini, F Giganti

  • 1Department of Developmental Neuroscience, Stella Maris Scientific Institute, University of Pisa, 56018 Calambrone, Pisa, Italy.

Early Human Development
|April 9, 2005
PubMed

Insights

This study analyzed 24-hour electroencephalogram (EEG) patterns in preterm and near-term neonates. Key EEG patterns shift with postmenstrual age and show distinct diurnal variations, impacting sleep organization.

Area of Science:

  • Neonatal Neurology
  • Sleep Medicine
  • Developmental Neuroscience

Background:

  • Neonatal electroencephalogram (EEG) patterns are crucial indicators of brain development and function.
  • Understanding the typical organization and evolution of these patterns is essential for identifying neurological abnormalities.
  • Previous research often relied on shorter EEG recordings, limiting insights into 24-hour sleep-wake cycles and developmental changes.

Purpose of the Study:

  • To evaluate the organization of EEG patterns over 24-hour recordings in preterm and near-term neonates.
  • To analyze the distribution of different EEG patterns based on postmenstrual age (PMA).
  • To investigate variations in sleep-related EEG pattern organization during daytime and nighttime hours.

Main Methods:

  • Utilized 24-hour continuous EEG recordings from preterm and near-term neonates.
  • Classified and quantified various EEG patterns throughout the recording periods.
  • Correlated EEG pattern distribution and sleep organization with postmenstrual age and time of day (day vs. night).

Main Results:

  • Confirmed the age-dependent appearance of neonatal EEG patterns previously described in shorter studies.
  • Observed a decrease in medium-voltage continuous EEG (pattern "3") as neonates approached term, coinciding with the emergence of low-voltage continuous patterns (patterns "1" and "2") associated with active sleep and wakefulness.
  • Found that discontinuous EEG (pattern "7"), linked to quiet sleep, decreased with age but was significantly more prevalent during daytime hours compared to nighttime.

Conclusions:

  • Neonatal EEG pattern organization exhibits significant changes with increasing postmenstrual age, reflecting neurodevelopmental maturation.
  • Diurnal variations in EEG patterns are evident, with specific patterns showing differential distribution between day and night, impacting sleep state organization.
  • Continuous 24-hour EEG monitoring provides a comprehensive understanding of neonatal brain activity and sleep architecture crucial for clinical assessment.

More Related Videos

How to Obtain Reliable Visual Event-related Potentials in Newborns07:39

How to Obtain Reliable Visual Event-related Potentials in Newborns

Published on: October 24, 2019

Application of an Amplitude-integrated EEG Monitor (Cerebral Function Monitor) to Neonates05:58

Application of an Amplitude-integrated EEG Monitor (Cerebral Function Monitor) to Neonates

Published on: September 6, 2017

Related Concept Videos

Brain Waves01:23

Brain Waves

Brain waves are electrical signals generated by the neurons in the brain, which are regularly monitored to measure mental activities. Brain waves and their frequency ranges can be measured using an electroencephalogram or EEG. There are four main types of brain waves, each with distinct characteristics:
Sleep-Wake Cycles01:24

Sleep-Wake Cycles

Sleep is an essential physiological process vital to maintaining overall well-being. The reticular activating system (RAS), a network of neurons in the brainstem, regulates wakefulness and sleep. While it may seem passive, sleep consists of distinct cycles, each with its unique characteristics and functions. Two key sleep phases are non-rapid eye movement (NREM) and  rapid eye movement (REM).
NREM Sleep
NREM sleep comprises four progressive stages that seamlessly merge:
Stages of Sleep01:22

Stages of Sleep

Sleep progresses through distinct stages, each characterized by specific brain wave patterns and physiological responses ranging from wakefulness to stages of non-rapid eye movement, known as non-REM, to rapid eye movement, referred to as REM. Understanding these stages helps in recognizing how sleep supports various bodily and cognitive functions.
Before sleep begins, in wakefulness, the brain exhibits primarily beta waves, which are high in frequency and low in amplitude, indicating alertness...