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Updated: Jun 11, 2026
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Infant Auditory Processing and Event-related Brain Oscillations
Published on: July 1, 2015
Model-based analysis and quantification of age trends in auditory evoked potentials
C C Kerr1, C J Rennie, P A Robinson
1School of Physics, University of Sydney, New South Wales 2006, Australia. ckerr@physics.usyd.edu.au
Summary
This study reveals how brain connectivity and signal speed change with age, impacting auditory evoked potentials (AEPs). These findings link developmental and aging effects on brain electrophysiology to anatomical and physiological shifts.
Area of Science:
- Neuroscience
- Computational Neuroscience
- Developmental Neuroscience
Background:
- The physiological underpinnings of age-related alterations in auditory evoked potentials (AEPs) remain unclear.
- Understanding these changes is crucial for characterizing brain development and aging.
Purpose of the Study:
- To investigate age- and task-related changes in AEPs using a mathematical model of neuronal activity.
- To infer underlying physiological changes contributing to AEP variations across the lifespan.
Main Methods:
- Employed a quantitative, physiology-based model of cortical and thalamic neuronal activity.
- Analyzed oddball AEPs from a large cohort of 1498 healthy individuals aged 6 to 86 years.
Main Results:
- Differences in thalamic and cortical neuron connection strengths explain variations in standard and target AEP responses.
- Signal propagation time between thalamus and cortex shows age-dependent changes: decreasing with development and increasing with aging.
- Significant age-related trends were observed in intracortical and thalamocortical neuronal connection strengths.
Conclusions:
- AEP latency changes are primarily driven by alterations in thalamocortical signal propagation time.
- Development involves substantial changes in neuronal connection strengths, leading to increased thalamocortical inhibition and decreased excitation.
- Divergence in AEP parameters between standard and target stimuli during adolescence is attributed to modifications in thalamocortical loop activity.
