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Maturation and effect of stimulus rate on brainstem auditory evoked potentials
G Lina-Granade1, L Collet, A Morgon
1Laboratoire de Physiologie Sensorielle, Université Claude Bernard, CNRS URA 1447, Lyon, France.
Brain & Development
|July 1, 1993
Summary
Brainstem auditory evoked potentials (BAEPs) reveal auditory adaptation changes in preterm infants. Maturation primarily impacts central nervous system synapses, not peripheral pathways.
Area of Science:
- Neuroscience
- Developmental Neuroscience
- Auditory Neuroscience
Background:
- Auditory adaptation, the change in neural response with repeated stimulation, is crucial for auditory processing.
- Understanding auditory adaptation development in preterm infants is vital for assessing auditory pathway maturation.
Purpose of the Study:
- To investigate the developmental changes in auditory adaptation using Brainstem Auditory Evoked Potentials (BAEPs) in preterm infants.
- To compare auditory adaptation maturation between preterm infants and adults.
Main Methods:
- BAEPs were recorded in 104 preterm infants (32-39 weeks conceptional age) and 20 adults at stimulus rates of 20, 41.3, and 61.3 c/s.
- Latency shifts of BAEP waves (I, III, V) between high and low stimulus rates were calculated and analyzed as a function of conceptional age.
Main Results:
- Conceptional age significantly affected the latency shifts of wave V at 61.3-20 c/s and 41.3-20 c/s.
- Adults showed significant differences in wave V and wave III latency shifts compared to newborns.
- No significant differences were observed in wave I latency shifts between age groups.
Conclusions:
- Auditory adaptation maturation in preterm infants is primarily influenced by central nervous system processes, particularly central synapses.
- These findings suggest that developmental changes in auditory processing efficiency are concentrated at the central level.