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Maturation of the auditory event-related potentials during the first year of life
Elena Kushnerenko1, Rita Ceponiene, Polina Balan
1Department of Psychology, University of Helsinki, Finland.
Insights
Auditory event-related potentials (ERPs) in infants show key peaks present at birth. Maturation involves changes in amplitude and latency, suggesting functional generators are present from the start.
Area of Science:
- Neuroscience
- Developmental Neuroscience
- Auditory Neuroscience
Background:
- Cortical auditory event-related potentials (ERPs) are crucial for understanding auditory development.
- Previous research suggests significant changes in ERPs during early infancy.
Purpose of the Study:
- To investigate the maturation of auditory ERPs from birth to 12 months of age.
- To identify the developmental trajectory of specific ERP components (P150, N250, P350, N450).
Main Methods:
- Studied 15 infants longitudinally from birth to 12 months.
- Recorded and analyzed cortical auditory event-related potentials (ERPs).
- Measured ERP peak amplitudes and latencies.
Main Results:
- All major ERP peaks (P150, N250, P350, N450) were identifiable at birth.
- ERP amplitudes increased, and latencies shortened with age.
- The rate of amplitude growth varied among different ERP peaks.
Conclusions:
- The neural generators for infantile auditory ERPs are functional at birth.
- Maturation of ERP morphology is primarily due to changes in the relative strengths of these generators.
- Early auditory processing capabilities are present from the earliest stages of life.
Abstract:
This study examined the maturation of cortical auditory event-related potentials (ERPs) from birth until 12 months of age. In the 15 infants studied, all ERP peaks observable at 12 months of age, the P150, N250, P350, and N450 were identifiable already at birth, As in previous studies, the amplitudes of the ERP peaks increased and latencies shortened with increasing age. In addition, the time courses of the amplitude growth of these peaks differed from each other. It was concluded, that the generators of all the infantile ERP peaks are functional already at birth, and that the maturational changes in the waveform morphology can mostly be accounted for by the changing relative strengths of the different generators.