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Updated: Jul 28, 2025
Infant Auditory Processing and Event-related Brain Oscillations
Published on: July 1, 2015
Deficits in neural encoding of speech in preterm infants
Nikolay Novitskiy1, Peggy H Y Chan2, Mavis Chan1
1Brain and Mind Institute, The Chinese University of Hong Kong, Hong Kong, China.
Insights
Preterm infants show subtle language deficits. Electroencephalography (EEG) revealed differences in neural speech encoding (frequency following response) between preterm and term infants, highlighting potential pathophysiological pathways.
Area of Science:
- Neuroscience
- Developmental Psychology
- Speech-Language Pathology
Background:
- Preterm infants often experience subtle cognitive and language deficits, detectable later in life.
- Previous research focused on anatomical brain differences, overlooking underlying pathophysiological processes.
- Neural speech encoding, measured via EEG, predicts language development and may reveal these processes.
Purpose of the Study:
- To investigate neural speech encoding differences in preterm infants using EEG.
- To identify pathophysiological pathways contributing to language deficits in preterm children.
- To examine the relationship between prematurity, age, and speech processing in infants.
Main Methods:
- Recorded EEG from 45 preterm (≤34 weeks gestation) and 45 term (≥38 weeks) infants (0-12 months corrected age) during sleep.
- Infants listened to native and non-native Chinese speech stimuli varying in lexical pitch.
- Analyzed EEG frequency following response (FFR) measures, focusing on synchronization and power.
Main Results:
- No significant effect of stimulus nativeness on FFR measures was found.
- Main effects of age were observed, consistent with previous developmental studies.
- A significant main effect of prematurity emerged, with synchronization measures showing greater group differences than power.
Conclusions:
- EEG-based FFR measures reveal distinct neural speech processing patterns in preterm infants.
- Synchronization measures of FFR are more sensitive to prematurity effects than power measures.
- This study advances understanding of the pathophysiological basis for language difficulties in preterm children.
Abstract:
Preterm children show developmental cognitive and language deficits that can be subtle and sometimes undetectable until later in life. Studies of brain development in children who are born preterm have largely focused on vascular and gross anatomical characteristics rather than pathophysiological processes that may contribute to these developmental deficits. Neural encoding of speech as reflected in EEG recordings is predictive of future language development and could provide insights into those pathophysiological processes. We recorded EEG from 45 preterm (≤ 34 weeks of gestation) and 45 term (≥ 38 weeks) Chinese-learning infants 0-12 months of (corrected) age during natural sleep. Each child listened to three speech stimuli that differed in lexically meaningful pitch (2 native and 1 non-native speech categories). EEG measures associated with synchronization and gross power of the frequency following response (FFR) were examined. ANCOVAs revealed no main effect of stimulus nativeness but main effects of age, consistent with earlier studies. A main effect of prematurity also emerged, with synchronization measures showing stronger group differences than power. By detailing differences in FFR measures related to synchronization and power, this study brings us closer to identifying the pathophysiological pathway to often subtle language problems experienced by preterm children.
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