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Updated: Jun 4, 2025
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Infant Auditory Processing and Event-related Brain Oscillations
Published on: July 1, 2015
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Auditory Rhythm Encoding during the Last Trimester of Human Gestation: From Tracking the Basic Beat to Tracking
Bahar Saadatmehr1, Mohammadreza Edalati1, Fabrice Wallois1,2
1Inserm UMR1105, Groupe de Recherches sur l'Analyse Multimodale de la Fonction Cérébrale, CURS, Amiens Cedex 80036, France.
Summary
Neural processing of auditory rhythm, crucial for development, strengthens in preterm infants during the third trimester. This study shows developing brains synchronize better to complex rhythms as gestational age increases.
Area of Science:
- Neuroscience
- Developmental Neuroscience
- Auditory Neuroscience
Background:
- Rhythm perception is vital for language, music, and social skills.
- The fetal environment contains rich auditory rhythms, and newborns show rhythm sensitivity.
- Neural development during the third trimester involves processing auditory information.
Purpose of the Study:
- To investigate the developmental trajectory of neural rhythm processing in preterm infants.
- To determine when neural synchronization to auditory rhythms emerges during late gestation.
Main Methods:
- Cross-sectional study of 46 neonates (27-35 weeks gestational age).
- High-density electroencephalography (EEG) during sleep to measure neural responses to auditory rhythms.
- Analysis of neural synchronization to fast isochronous beats and slower metrical structures.
Main Results:
- Neural synchronization to auditory beat and meter strengthens with increasing gestational age.
- Infants born after 33 weeks gestational age showed synchronization to both beat and meter, unlike younger infants.
- This suggests the neural encoding of nested rhythmic periodicities develops during late gestation.
Conclusions:
- The brain's ability to process hierarchical auditory rhythms rapidly evolves during the third trimester.
- This development coincides with the establishment of thalamocortical connections.
- Findings illuminate the neurodevelopmental basis of rhythm processing from early gestation.
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