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Updated: Jul 20, 2026
Infant Auditory Processing and Event-related Brain Oscillations
Published on: July 1, 2015
Rapid cortical oscillations and early motor activity in premature human neonate
Mathieu Milh1, Anna Kaminska, Catherine Huon
1INMED/INSERM U29, Université de la Méditerranée, Marseille, France.
Insights
Spontaneous fetal movements trigger delta-brush brain activity in premature infants. This sensory feedback in the somatosensory cortex helps form body maps before external sensory input begins.
Area of Science:
- Neuroscience
- Developmental Neuroscience
- Human Physiology
Background:
- Delta-brushes are dominant rapid oscillatory patterns (8-25 Hz) in the human cortex during the third trimester.
- Understanding the origins of cortical activity in preterm neonates is crucial for developmental insights.
Purpose of the Study:
- To investigate the relationship between delta-brushes in the somatosensory cortex and spontaneous movements in premature neonates.
- To determine if sensory feedback from fetal movements influences cortical activity.
Main Methods:
- Utilized scalp electroencephalography (EEG) to monitor brain activity.
- Employed motor activity monitoring in premature neonates (29-31 weeks postconceptional age).
- Applied direct hand and foot stimulation to observe cortical responses.
Main Results:
- Sporadic hand and foot movements preceded delta-brush appearance in corresponding cortical areas (lateral and medial central cortex).
- Direct stimulation of hands and feet reliably evoked delta-brushes in the same somatotopic regions.
- Sensory feedback from spontaneous movements appears to trigger delta-brush oscillations in a somatotopic manner.
Conclusions:
- Spontaneous fetal movements provide essential sensory stimulation to the developing somatosensory cortex.
- This somatosensory input drives delta-brush oscillations, contributing to the formation of cortical body maps in utero.
- Delta-brushes are linked to sensory feedback mechanisms in the fetal brain before external sensory integration.
Abstract:
Delta-brush is the dominant pattern of rapid oscillatory activity (8-25 Hz) in the human cortex during the third trimester of gestation. Here, we studied the relationship between delta-brushes in the somatosensory cortex and spontaneous movements of premature human neonates of 29-31 weeks postconceptional age using a combination of scalp electroencephalography and monitoring of motor activity. We found that sporadic hand and foot movements heralded the appearance of delta-brushes in the corresponding areas of the cortex (lateral and medial regions of the contralateral central cortex, respectively). Direct hand and foot stimulation also reliably evoked delta-brushes in the same areas. These results suggest that sensory feedback from spontaneous fetal movements triggers delta-brush oscillations in the central cortex in a somatotopic manner. We propose that in the human fetus in utero, before the brain starts to receive elaborated sensory input from the external world, spontaneous fetal movements provide sensory stimulation and drive delta-brush oscillations in the developing somatosensory cortex contributing to the formation of cortical body maps.
