Aided electrophysiology using direct audio input: Effects of amplification and absolute signal level

Ingyu Chun; Curtis J. Billings; Christi W. Miller; Kelly L. Tremblay

doi:10.1044/2015_AJA-15-0029

Aided electrophysiology using direct audio input: Effects of amplification and absolute signal level

Ingyu Chun, Curtis J. Billings, Christi W. Miller, Kelly L. Tremblay

Otolaryngology

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

Abstract

Purpose: This study investigated (a) the effect of amplification on cortical auditory evoked potentials (CAEPs) at different signal levels when signal-to-noise ratios (SNRs) were equated between unaided and aided conditions, and (b) the effect of absolute signal level on aided CAEPs when SNR was held constant. Method: CAEPs were recorded from 13 young adults with normal hearing. A 1000-Hz pure tone was presented in unaided and aided conditions with a linear analog hearing aid. Direct audio input was used, allowing recorded hearing aid noise floor to be added to unaided conditions to equate SNRs between conditions. An additional stimulus was created through scaling the noise floor to study the effect of signal level. Results: Amplification resulted in delayed N1 and P2 peak latencies relative to the unaided condition. An effect of absolute signal level (when SNR was constant) was present for aided CAEP area measures, such that larger area measures were found at higher levels. Conclusion: Results of this study further demonstrate that factors in addition to SNR must also be considered before CAEPs can be used to clinically to measure aided thresholds

Original language	English (US)
Pages (from-to)	14-24
Number of pages	11
Journal	American journal of audiology
Volume	25
Issue number	1
DOIs	https://doi.org/10.1044/2015_AJA-15-0029
State	Published - Mar 2016

ASJC Scopus subject areas

Speech and Hearing

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10.1044/2015_AJA-15-0029

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@article{8637f24a7ee140a7b267cf8bd4f5ce41,

title = "Aided electrophysiology using direct audio input: Effects of amplification and absolute signal level",

abstract = "Purpose: This study investigated (a) the effect of amplification on cortical auditory evoked potentials (CAEPs) at different signal levels when signal-to-noise ratios (SNRs) were equated between unaided and aided conditions, and (b) the effect of absolute signal level on aided CAEPs when SNR was held constant. Method: CAEPs were recorded from 13 young adults with normal hearing. A 1000-Hz pure tone was presented in unaided and aided conditions with a linear analog hearing aid. Direct audio input was used, allowing recorded hearing aid noise floor to be added to unaided conditions to equate SNRs between conditions. An additional stimulus was created through scaling the noise floor to study the effect of signal level. Results: Amplification resulted in delayed N1 and P2 peak latencies relative to the unaided condition. An effect of absolute signal level (when SNR was constant) was present for aided CAEP area measures, such that larger area measures were found at higher levels. Conclusion: Results of this study further demonstrate that factors in addition to SNR must also be considered before CAEPs can be used to clinically to measure aided thresholds",

author = "Ingyu Chun and Billings, {Curtis J.} and Miller, {Christi W.} and Tremblay, {Kelly L.}",

note = "Funding Information: This work was supported by National Institutes of Health (NIDCD 1R01DC012769 and P30DC004661) and the U.S. Department of Veteran Affairs (RR&D C8006W). The contents do not represent the views of the U.S. government or the Department of Veterans Affairs. The first author is currently employed by Starkey Hearing Technologies; however, this study was completed prior to employment. Thanks to Katrina McClannahan and Sarah Levy for help in CAEP acquisition and Brandon Madsen and Tina Penman for help with CAEP analysis. Publisher Copyright: {\textcopyright} 2016 American Speech-Language-Hearing Association.",

year = "2016",

month = mar,

doi = "10.1044/2015_AJA-15-0029",

language = "English (US)",

volume = "25",

pages = "14--24",

journal = "American Journal of Audiology",

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T2 - Effects of amplification and absolute signal level

AU - Chun, Ingyu

AU - Billings, Curtis J.

AU - Miller, Christi W.

AU - Tremblay, Kelly L.

N1 - Funding Information: This work was supported by National Institutes of Health (NIDCD 1R01DC012769 and P30DC004661) and the U.S. Department of Veteran Affairs (RR&D C8006W). The contents do not represent the views of the U.S. government or the Department of Veterans Affairs. The first author is currently employed by Starkey Hearing Technologies; however, this study was completed prior to employment. Thanks to Katrina McClannahan and Sarah Levy for help in CAEP acquisition and Brandon Madsen and Tina Penman for help with CAEP analysis. Publisher Copyright: © 2016 American Speech-Language-Hearing Association.

PY - 2016/3

Y1 - 2016/3

N2 - Purpose: This study investigated (a) the effect of amplification on cortical auditory evoked potentials (CAEPs) at different signal levels when signal-to-noise ratios (SNRs) were equated between unaided and aided conditions, and (b) the effect of absolute signal level on aided CAEPs when SNR was held constant. Method: CAEPs were recorded from 13 young adults with normal hearing. A 1000-Hz pure tone was presented in unaided and aided conditions with a linear analog hearing aid. Direct audio input was used, allowing recorded hearing aid noise floor to be added to unaided conditions to equate SNRs between conditions. An additional stimulus was created through scaling the noise floor to study the effect of signal level. Results: Amplification resulted in delayed N1 and P2 peak latencies relative to the unaided condition. An effect of absolute signal level (when SNR was constant) was present for aided CAEP area measures, such that larger area measures were found at higher levels. Conclusion: Results of this study further demonstrate that factors in addition to SNR must also be considered before CAEPs can be used to clinically to measure aided thresholds

AB - Purpose: This study investigated (a) the effect of amplification on cortical auditory evoked potentials (CAEPs) at different signal levels when signal-to-noise ratios (SNRs) were equated between unaided and aided conditions, and (b) the effect of absolute signal level on aided CAEPs when SNR was held constant. Method: CAEPs were recorded from 13 young adults with normal hearing. A 1000-Hz pure tone was presented in unaided and aided conditions with a linear analog hearing aid. Direct audio input was used, allowing recorded hearing aid noise floor to be added to unaided conditions to equate SNRs between conditions. An additional stimulus was created through scaling the noise floor to study the effect of signal level. Results: Amplification resulted in delayed N1 and P2 peak latencies relative to the unaided condition. An effect of absolute signal level (when SNR was constant) was present for aided CAEP area measures, such that larger area measures were found at higher levels. Conclusion: Results of this study further demonstrate that factors in addition to SNR must also be considered before CAEPs can be used to clinically to measure aided thresholds

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Aided electrophysiology using direct audio input: Effects of amplification and absolute signal level

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