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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...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
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Public Library of Science
2017
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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. |
format | Online Article Text |
id | pubmed-5367810 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2017 |
publisher | Public Library of Science |
record_format | MEDLINE/PubMed |
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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