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Contextual Lateralization Based on Interaural Level Differences Is Preshaped by the Auditory Periphery and Predominantly Immune Against Sequential Segregation
The perceived azimuth of a target sound is determined by the interaural time difference and the interaural level difference (ILD) and is subject to contextual effects from precursor sounds. This study characterized ILD-based precursor effects (PEs) for high-frequency stimuli in a total of seven norm...
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Formato: | Online Artículo Texto |
Lenguaje: | English |
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SAGE Publications
2023
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10185981/ https://www.ncbi.nlm.nih.gov/pubmed/37161352 http://dx.doi.org/10.1177/23312165231171988 |
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author | Laback, Bernhard |
author_facet | Laback, Bernhard |
author_sort | Laback, Bernhard |
collection | PubMed |
description | The perceived azimuth of a target sound is determined by the interaural time difference and the interaural level difference (ILD) and is subject to contextual effects from precursor sounds. This study characterized ILD-based precursor effects (PEs) for high-frequency stimuli in a total of seven normal-hearing listeners. In Experiment 1, precursor and target were band-pass-filtered noises approximately centered at 4 kHz (1.2- and 1-octave bandwidth, respectively) separated by a 10-ms gap. The effects of precursor location (ipsilateral, contralateral, and central) on the perceived target azimuth were measured using a head-pointing task. Relative to control trials without a precursor, ipsilateral precursors biased the perceived target azimuth toward midline (medial bias) and contralateral precursors biased it contralaterally (lateral bias). Central precursors caused a symmetric lateral bias. An auditory periphery model that determines the “internal” ILD at the auditory nerve level, including either realistic efferent compression control or auditory nerve adaptation, explained about 50% of the variance in the PEs. These within-trial PEs were accompanied by an across-trial PE, inducing medial bias. Experiment 2 studied the role of sequential segregation in the within-trial PE by introducing a pitch difference between precursor and target. Segregation conditions caused increased PE for ipsilateral, no effect for contralateral, and either no effect or reduced PE for central precursors. Overall, the ILD-based within-trial PE appears to be preshaped already in the auditory periphery and the mechanism underlying at least the ipsilateral PE appears to be immune against sequential segregation. |
format | Online Article Text |
id | pubmed-10185981 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2023 |
publisher | SAGE Publications |
record_format | MEDLINE/PubMed |
spelling | pubmed-101859812023-05-17 Contextual Lateralization Based on Interaural Level Differences Is Preshaped by the Auditory Periphery and Predominantly Immune Against Sequential Segregation Laback, Bernhard Trends Hear Original Article The perceived azimuth of a target sound is determined by the interaural time difference and the interaural level difference (ILD) and is subject to contextual effects from precursor sounds. This study characterized ILD-based precursor effects (PEs) for high-frequency stimuli in a total of seven normal-hearing listeners. In Experiment 1, precursor and target were band-pass-filtered noises approximately centered at 4 kHz (1.2- and 1-octave bandwidth, respectively) separated by a 10-ms gap. The effects of precursor location (ipsilateral, contralateral, and central) on the perceived target azimuth were measured using a head-pointing task. Relative to control trials without a precursor, ipsilateral precursors biased the perceived target azimuth toward midline (medial bias) and contralateral precursors biased it contralaterally (lateral bias). Central precursors caused a symmetric lateral bias. An auditory periphery model that determines the “internal” ILD at the auditory nerve level, including either realistic efferent compression control or auditory nerve adaptation, explained about 50% of the variance in the PEs. These within-trial PEs were accompanied by an across-trial PE, inducing medial bias. Experiment 2 studied the role of sequential segregation in the within-trial PE by introducing a pitch difference between precursor and target. Segregation conditions caused increased PE for ipsilateral, no effect for contralateral, and either no effect or reduced PE for central precursors. Overall, the ILD-based within-trial PE appears to be preshaped already in the auditory periphery and the mechanism underlying at least the ipsilateral PE appears to be immune against sequential segregation. SAGE Publications 2023-05-09 /pmc/articles/PMC10185981/ /pubmed/37161352 http://dx.doi.org/10.1177/23312165231171988 Text en © The Author(s) 2023 https://creativecommons.org/licenses/by-nc/4.0/This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 License (https://creativecommons.org/licenses/by-nc/4.0/) which permits non-commercial use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access page (https://us.sagepub.com/en-us/nam/open-access-at-sage). |
spellingShingle | Original Article Laback, Bernhard Contextual Lateralization Based on Interaural Level Differences Is Preshaped by the Auditory Periphery and Predominantly Immune Against Sequential Segregation |
title | Contextual Lateralization Based on Interaural Level Differences Is Preshaped
by the Auditory Periphery and Predominantly Immune Against Sequential
Segregation |
title_full | Contextual Lateralization Based on Interaural Level Differences Is Preshaped
by the Auditory Periphery and Predominantly Immune Against Sequential
Segregation |
title_fullStr | Contextual Lateralization Based on Interaural Level Differences Is Preshaped
by the Auditory Periphery and Predominantly Immune Against Sequential
Segregation |
title_full_unstemmed | Contextual Lateralization Based on Interaural Level Differences Is Preshaped
by the Auditory Periphery and Predominantly Immune Against Sequential
Segregation |
title_short | Contextual Lateralization Based on Interaural Level Differences Is Preshaped
by the Auditory Periphery and Predominantly Immune Against Sequential
Segregation |
title_sort | contextual lateralization based on interaural level differences is preshaped
by the auditory periphery and predominantly immune against sequential
segregation |
topic | Original Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10185981/ https://www.ncbi.nlm.nih.gov/pubmed/37161352 http://dx.doi.org/10.1177/23312165231171988 |
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