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Functional auditory development in preterm and full term infants

L Eldredge1, A Salamy

  • 1Cardiovascular Research Institute, University of California, San Francisco, USA.

Early Human Development
|July 19, 1996
PubMed
Summary
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This study reveals significant auditory processing differences in infants, with a right ear advantage and distinct gender-based responses observed in auditory brainstem responses (ABRs). These findings highlight early neurological development patterns in neonates.

Area of Science:

  • Neuroscience
  • Developmental Pediatrics
  • Auditory Neuroscience

Background:

  • Auditory brainstem responses (ABRs) are crucial for assessing auditory pathway function in infants.
  • Understanding developmental changes in auditory processing is vital for early identification of potential neurological differences.

Purpose of the Study:

  • To investigate laterality, gender, and gestational age effects on auditory brainstem responses (ABRs) in infants.
  • To explore the impact of stimulation rate on ABR parameters in neonates.
  • To enhance understanding of early-life auditory development and neurological maturation.

Main Methods:

  • Bilateral ABRs were recorded from 452 infants (32-45 weeks conceptional age).
  • Auditory brainstem response (ABR) parameters including latencies and amplitudes were analyzed.

Related Experiment Videos

  • Rate-dependent effects on ABRs were examined in a subsample of 145 infants.

    • Main Results:

    • Significant right ear advantage observed for most ABR measures, with shorter interwave intervals and larger amplitudes on the right.
    • Females showed shorter absolute latencies (waves III, V) and larger wave I amplitudes compared to males.
    • Small for gestational age (SGA) infants exhibited shorter wave V latencies and interwave intervals, suggesting accelerated neurological development.

    Conclusions:

    • Neonatal auditory processing demonstrates a subtle but significant right ear advantage and clear gender differences.
    • Findings in neonates differ from older populations, emphasizing unique developmental trajectories.
    • Accelerated neurological development may occur in growth-retarded infants, as indicated by ABR patterns.