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Infant Auditory Processing and Event-related Brain Oscillations

Infant Auditory Processing and Event-related Brain Oscillations

Published on: July 1, 2015

Spectral Ripple Discrimination in Normal-Hearing Infants.

David L Horn¹, Jong Ho Won, Jay T Rubinstein

¹1Virginia Merrill Bloedel Hearing Research Center, Department of Otolaryngology-Head and Neck Surgery, University of Washington, Seattle, Washington, USA; 2Division of Otolaryngology, Seattle Children's Hospital, Seattle, Wahington, USA; and 3Department of Speech and Hearing Sciences, University of Washington, Seattle, Washington.

Ear and Hearing

|October 22, 2016

Summary

This summary is machine-generated.

Spectral resolution, measured by spectral ripple discrimination (SRD), is crucial for cochlear implant (CI) users. Normal-hearing infants show developing spectral resolution, with performance limited by across-channel intensity processing, impacting CI efficacy assessments.

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Area of Science:

Auditory Neuroscience
Developmental Psychology
Speech-Language Pathology

Background:

Spectral resolution is vital for speech understanding in cochlear implant (CI) users.
Assessing spectral resolution development in normal-hearing children is necessary to evaluate CI device efficacy in young users.
Spectral ripple discrimination (SRD) measures sensitivity to spectral envelope phase shifts.

Purpose of the Study:

To investigate the development of spectral resolution in normal-hearing infants and adults using SRD.
To determine the effects of age and spectral ripple depth on SRD performance.
To inform the application of SRD for assessing CI device efficacy in young children.

Main Methods:

Measured SRD thresholds, representing the highest ripple density discriminable.
Employed a between-subjects design varying age (infants vs. adults) and ripple depth (10, 13, 20 dB) in Experiment 1.
Utilized a randomized starting phase task in Experiments 2 and 3 to obscure within-channel intensity cues and assess SRD across different infant ages (3-7 months) and adults.

Main Results:

Infants performed worse than adults at lower ripple depths (10, 13 dB) but similarly at 20 dB in Experiment 1, suggesting immature across-channel intensity resolution.
Experiment 2 results indicated infant performance was poorer at 20 dB with randomized phases, attributing Experiment 1's findings to infants' use of within-channel intensity cues.
Experiment 3 confirmed infants (3-7 months) had poorer SRD than adults, with no significant age-depth interaction.

Conclusions:

Measuring SRD in infants aged 3-7 months is feasible.
Infant SRD performance may be constrained by across-channel intensity resolution, despite potentially mature frequency resolution.
Findings guide the design of SRD stimuli for CI infant testing, suggesting obscuring within-channel cues can reduce variability.