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Discrimination of rippled-spectrum patterns in noise: A manifestation of compressive nonlinearity

In normal-hearing listeners, rippled-spectrum discrimination was psychophysically investigated in both silence and with a simultaneous masker background using the following two paradigms: measuring the ripple density resolution with the phase-reversal test and measuring the ripple-shift threshold wi...

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Autores principales: Milekhina, Olga N., Nechaev, Dmitry I., Klishin, Vladimir O., Supin, Alexander Ya.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5367810/
https://www.ncbi.nlm.nih.gov/pubmed/28346538
http://dx.doi.org/10.1371/journal.pone.0174685
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author Milekhina, Olga N.
Nechaev, Dmitry I.
Klishin, Vladimir O.
Supin, Alexander Ya.
author_facet Milekhina, Olga N.
Nechaev, Dmitry I.
Klishin, Vladimir O.
Supin, Alexander Ya.
author_sort Milekhina, Olga N.
collection PubMed
description In normal-hearing listeners, rippled-spectrum discrimination was psychophysically investigated in both silence and with a simultaneous masker background using the following two paradigms: measuring the ripple density resolution with the phase-reversal test and measuring the ripple-shift threshold with the ripple-shift test. The 0.5-oct wide signal was centered on 2 kHz, the signal levels were 50 and 80 dB SPL, and the masker levels varied from 30 to 100 dB SPL. The baseline ripple density resolutions were 8.7 oct(-1) and 8.6 oct(-1) for the 50-dB and 80-dB signals, respectively. The baseline ripple shift thresholds were 0.015 oct and 0.018 oct for the 50-dB and 80-dB signals, respectively. The maskers were 0.5-oct noises centered on 2 kHz (on-frequency) or 0.75 to 1.25 oct below the signal (off-frequency maskers). The effects of the maskers were as follows: (i) both on- and low-frequency maskers reduced the ripple density resolution and increased the ripple shift thresholds, (ii) the masker levels at threshold (the ripple density resolution decrease down to 3 oct(–1) or ripple shift threshold increased up to 0.1 oct) increased with increasing frequency spacing between the signal and masker, (iii) the masker levels at threshold were higher for the 80-dB signal than for the 50-dB signal, and (iv) the difference between the masker levels at threshold for the 50-dB and 80-dB signals decreased with increasing frequency spacing between the masker and signal. Within the 30-dB (from 50 to 80 dB SPL) signal level, the growth of the masker level at threshold was 27.8 dB for the on-frequency masker and 9 dB for the low-frequency masker. It is assumed that the difference between the on- and low-frequency masking of the rippled-spectrum discrimination reflects the cochlear compressive non-linearity. With this assumption, the compression was 0.3 dB/dB.
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spelling pubmed-53678102017-04-06 Discrimination of rippled-spectrum patterns in noise: A manifestation of compressive nonlinearity Milekhina, Olga N. Nechaev, Dmitry I. Klishin, Vladimir O. Supin, Alexander Ya. PLoS One Research Article In normal-hearing listeners, rippled-spectrum discrimination was psychophysically investigated in both silence and with a simultaneous masker background using the following two paradigms: measuring the ripple density resolution with the phase-reversal test and measuring the ripple-shift threshold with the ripple-shift test. The 0.5-oct wide signal was centered on 2 kHz, the signal levels were 50 and 80 dB SPL, and the masker levels varied from 30 to 100 dB SPL. The baseline ripple density resolutions were 8.7 oct(-1) and 8.6 oct(-1) for the 50-dB and 80-dB signals, respectively. The baseline ripple shift thresholds were 0.015 oct and 0.018 oct for the 50-dB and 80-dB signals, respectively. The maskers were 0.5-oct noises centered on 2 kHz (on-frequency) or 0.75 to 1.25 oct below the signal (off-frequency maskers). The effects of the maskers were as follows: (i) both on- and low-frequency maskers reduced the ripple density resolution and increased the ripple shift thresholds, (ii) the masker levels at threshold (the ripple density resolution decrease down to 3 oct(–1) or ripple shift threshold increased up to 0.1 oct) increased with increasing frequency spacing between the signal and masker, (iii) the masker levels at threshold were higher for the 80-dB signal than for the 50-dB signal, and (iv) the difference between the masker levels at threshold for the 50-dB and 80-dB signals decreased with increasing frequency spacing between the masker and signal. Within the 30-dB (from 50 to 80 dB SPL) signal level, the growth of the masker level at threshold was 27.8 dB for the on-frequency masker and 9 dB for the low-frequency masker. It is assumed that the difference between the on- and low-frequency masking of the rippled-spectrum discrimination reflects the cochlear compressive non-linearity. With this assumption, the compression was 0.3 dB/dB. Public Library of Science 2017-03-27 /pmc/articles/PMC5367810/ /pubmed/28346538 http://dx.doi.org/10.1371/journal.pone.0174685 Text en © 2017 Milekhina et al http://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
spellingShingle Research Article
Milekhina, Olga N.
Nechaev, Dmitry I.
Klishin, Vladimir O.
Supin, Alexander Ya.
Discrimination of rippled-spectrum patterns in noise: A manifestation of compressive nonlinearity
title Discrimination of rippled-spectrum patterns in noise: A manifestation of compressive nonlinearity
title_full Discrimination of rippled-spectrum patterns in noise: A manifestation of compressive nonlinearity
title_fullStr Discrimination of rippled-spectrum patterns in noise: A manifestation of compressive nonlinearity
title_full_unstemmed Discrimination of rippled-spectrum patterns in noise: A manifestation of compressive nonlinearity
title_short Discrimination of rippled-spectrum patterns in noise: A manifestation of compressive nonlinearity
title_sort discrimination of rippled-spectrum patterns in noise: a manifestation of compressive nonlinearity
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5367810/
https://www.ncbi.nlm.nih.gov/pubmed/28346538
http://dx.doi.org/10.1371/journal.pone.0174685
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