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J Am Acad Audiol 2022; 33(05): 301-310
DOI: 10.1055/a-1862-0198
Research Article

The Maturation of the Acoustic Change Complex in Response to Iterated Ripple Noise in ‘Normal’-Hearing Infants, Toddlers, and Adults

S. Strahm
1   School of Audiology and Speech Sciences, The University of British Columbia, Vancouver, Canada
,
S. A. Small
1   School of Audiology and Speech Sciences, The University of British Columbia, Vancouver, Canada
,
S. Chan
1   School of Audiology and Speech Sciences, The University of British Columbia, Vancouver, Canada
,
D. Y. Tian
2   Department of Medicine, The University of Alberta, Edmonton, Canada
,
M. Sharma
3   Department of Linguistics and The HEARing Cooperative Research Centre , Macquarie University, Sydney, Australia
› Author Affiliations Funding Research supported by Natural Sciences and Engineering Research Council (NSERC) - Discovery Grant, Canada to Susan A. Small; NSERC Canadian Graduate Scholarship -Master's Program to Stephanie Strahm; Undergraduate Student Research Award to D.Y. Tian; and HEARing CRC, Australia to Mridula Sharma.
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Abstract

Background Infants and toddlers are still being evaluated for their hearing sensitivity but not their auditory-processing skills. Iterated rippled noise (IRN) stimuli require the auditory system to utilize the temporal periodicity and autocorrelate the iterations to perceive pitch.

Purpose This study investigated the acoustic change complex (ACC) elicited by IRN in “normal”-hearing infants, toddlers, and adults to determine the maturation of cortical processing of IRN stimuli.

Design Cortical responses to filtered white noise (onset) concatenated with IRN stimuli (d = 10 milliseconds, gain = 0.7 dB: 4–32 iterations) were recorded in quiet, alert participants.

Study Sample Participants included 25 infants (2.5–15 months), 27 toddlers (22–59 months), and 8 adults (19–25 years) with “normal” hearing sensitivity.

Data Collection and Analysis Cortical auditory-evoked responses were recorded for each participant, including the onset response to the noise and an ACC to the transition from noise to IRN. Group differences were assessed using repeated-measures analyses of variance.

Results Most infants had a replicable onset (P) response, while only about half had a measurable ACC (PACC) response to the high-saliency IRN condition. Most toddlers had onset responses and showed a P-NACC response to the IRN16 and IRN32 conditions. Most of the toddler group had responses present to the onset and showed a P-NACC response to all IRN conditions. Toddlers and adults showed similar P-NACC amplitudes; however, adults showed an increase in N1ACC amplitude with increase in IRN iterations (i.e., increased salience).

Conclusion While cortical responses to the percept of sound as determined by the onset response (P) to a stimulus are present in most infants, ACC responses to IRN stimuli are not mature in infancy. Most toddlers as young as 22 months, however, exhibited ACC responses to the IRN stimuli even when the pitch saliency was low (e.g., IRN4). The findings of the current study have implications for future research when investigating maturational effects on ACC and the optimal choice of stimuli.

Keywords

acoustic change complex - iterated rippled noise - children - maturation

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Supplementary Material



Publication History

Received: 17 January 2022

Accepted: 23 May 2022

Accepted Manuscript online:
25 May 2022

Article published online:
07 November 2022

© 2022. American Academy of Audiology. This article is published by Thieme.

Thieme Medical Publishers, Inc.
333 Seventh Avenue, 18th Floor, New York, NY 10001, USA

 

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