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Updated: May 7, 2025
Infant Auditory Processing and Event-related Brain Oscillations
Published on: July 1, 2015
Brain oscillatory activity evoked by chirp modulated tones in healthy children
Nadia Inés Irazabal1, Elena Urrestarazu2, Miguel Valencia3,4,5
1Paediatric Neurology Unit. Department of Paediatrics. Clinica Universidad de Navarra, Pamplona, Spain.
Insights
Cortical oscillatory activity in children develops with age, showing distinct patterns in gamma bands. This brain activity, measured using chirp-modulated tones (CMTs), may serve as a biomarker for cognitive and language development.
Area of Science:
- Neuroscience
- Developmental Neuroscience
- Auditory Neuroscience
Background:
- Cortical oscillatory activity and neuronal synchronization are crucial for cognitive functions.
- Understanding these processes in developing brains is essential for identifying neurodevelopmental disorders.
- Chirp-modulated tones (CMTs) offer a novel method to probe auditory cortical responses.
Purpose of the Study:
- To characterize cortical oscillatory activity and neuronal synchronization in response to CMTs in healthy children.
- To investigate the relationship between these brain responses and cognitive abilities across different age groups.
- To explore the potential of CMT-evoked responses as biomarkers for brain maturation and disorders.
Main Methods:
- Recruited 23 healthy children aged 1-18 years.
- Assessed cognitive abilities and recorded cortical oscillatory activity evoked by CMTs.
- Analyzed descriptive statistics and correlations between brain activity and cognitive measures.
Main Results:
- Neuronal synchronization in the low gamma band increased with age, reaching adult levels by 12 years.
- Higher neuronal recruitment in the high gamma band was observed in younger children.
- A negative correlation was found between receptive vocabulary and the frequency of maximal neuronal recruitment.
Conclusions:
- CMT-evoked cortical activity reflects brain maturation in children.
- These responses show potential as biomarkers for identifying language-related disabilities and other childhood brain disorders.
- Further research can establish these patterns for recognizing abnormal neurodevelopmental trajectories.
Aim:
To describe the features of cortical oscillatory activity and neuronal synchronization by monitoring responses evoked by chirp-modulated tone (CMT) and look for relationships with cognition in healthy children.
Methods:
We recruited 23 healthy children, 1-18 years old, assessed their cognitive abilities and recorded the cortical oscillatory activity evoked by CMTs. We obtained descriptive statistics and looked for correlations with cognitive abilities.
Results:
In the low gamma band, the neuronal synchronization evoked by CMTs increased with age, reaching adult features by 12 years of age (rho = 0.5; p = 0.042). In the high gamma band, neuronal recruitment was greater at younger ages (rho = -0.55; p = 0.029). In four of the six under-6-year-old participants, there was no CMT-evoked response. We found that the greater a child's receptive vocabulary skills, the lower the frequency at which maximal neuronal recruitment occurred (rho = -0.65; p = 0.003).
Interpretation:
CMT-evoked cortical oscillatory activity is affected by degree of brain maturation and could be a potential biomarker of language-related disability. Our description of the cortical responses evoked by CMTs in healthy children is a step towards recognition of abnormal patterns and the possible use of this approach as a biomarker of brain disorders in children.
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