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Evaluating auditory stream segregation of SAM tone sequences by subjective and objective psychoacoustical tasks, and brain activity

Auditory stream segregation refers to a segregated percept of signal streams with different acoustic features. Different approaches have been pursued in studies of stream segregation. In psychoacoustics, stream segregation has mostly been investigated with a subjective task asking the subjects to re...

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Autores principales: Dolležal, Lena-Vanessa, Brechmann, André, Klump, Georg M., Deike, Susann
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Frontiers Media S.A. 2014
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4047832/
https://www.ncbi.nlm.nih.gov/pubmed/24936170
http://dx.doi.org/10.3389/fnins.2014.00119
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author Dolležal, Lena-Vanessa
Brechmann, André
Klump, Georg M.
Deike, Susann
author_facet Dolležal, Lena-Vanessa
Brechmann, André
Klump, Georg M.
Deike, Susann
author_sort Dolležal, Lena-Vanessa
collection PubMed
description Auditory stream segregation refers to a segregated percept of signal streams with different acoustic features. Different approaches have been pursued in studies of stream segregation. In psychoacoustics, stream segregation has mostly been investigated with a subjective task asking the subjects to report their percept. Few studies have applied an objective task in which stream segregation is evaluated indirectly by determining thresholds for a percept that depends on whether auditory streams are segregated or not. Furthermore, both perceptual measures and physiological measures of brain activity have been employed but only little is known about their relation. How the results from different tasks and measures are related is evaluated in the present study using examples relying on the ABA- stimulation paradigm that apply the same stimuli. We presented A and B signals that were sinusoidally amplitude modulated (SAM) tones providing purely temporal, spectral or both types of cues to evaluate perceptual stream segregation and its physiological correlate. Which types of cues are most prominent was determined by the choice of carrier and modulation frequencies (f(mod)) of the signals. In the subjective task subjects reported their percept and in the objective task we measured their sensitivity for detecting time-shifts of B signals in an ABA- sequence. As a further measure of processes underlying stream segregation we employed functional magnetic resonance imaging (fMRI). SAM tone parameters were chosen to evoke an integrated (1-stream), a segregated (2-stream), or an ambiguous percept by adjusting the f(mod) difference between A and B tones (Δf(mod)). The results of both psychoacoustical tasks are significantly correlated. BOLD responses in fMRI depend on Δf(mod) between A and B SAM tones. The effect of Δf(mod), however, differs between auditory cortex and frontal regions suggesting differences in representation related to the degree of perceptual ambiguity of the sequences.
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spelling pubmed-40478322014-06-16 Evaluating auditory stream segregation of SAM tone sequences by subjective and objective psychoacoustical tasks, and brain activity Dolležal, Lena-Vanessa Brechmann, André Klump, Georg M. Deike, Susann Front Neurosci Psychology Auditory stream segregation refers to a segregated percept of signal streams with different acoustic features. Different approaches have been pursued in studies of stream segregation. In psychoacoustics, stream segregation has mostly been investigated with a subjective task asking the subjects to report their percept. Few studies have applied an objective task in which stream segregation is evaluated indirectly by determining thresholds for a percept that depends on whether auditory streams are segregated or not. Furthermore, both perceptual measures and physiological measures of brain activity have been employed but only little is known about their relation. How the results from different tasks and measures are related is evaluated in the present study using examples relying on the ABA- stimulation paradigm that apply the same stimuli. We presented A and B signals that were sinusoidally amplitude modulated (SAM) tones providing purely temporal, spectral or both types of cues to evaluate perceptual stream segregation and its physiological correlate. Which types of cues are most prominent was determined by the choice of carrier and modulation frequencies (f(mod)) of the signals. In the subjective task subjects reported their percept and in the objective task we measured their sensitivity for detecting time-shifts of B signals in an ABA- sequence. As a further measure of processes underlying stream segregation we employed functional magnetic resonance imaging (fMRI). SAM tone parameters were chosen to evoke an integrated (1-stream), a segregated (2-stream), or an ambiguous percept by adjusting the f(mod) difference between A and B tones (Δf(mod)). The results of both psychoacoustical tasks are significantly correlated. BOLD responses in fMRI depend on Δf(mod) between A and B SAM tones. The effect of Δf(mod), however, differs between auditory cortex and frontal regions suggesting differences in representation related to the degree of perceptual ambiguity of the sequences. Frontiers Media S.A. 2014-06-06 /pmc/articles/PMC4047832/ /pubmed/24936170 http://dx.doi.org/10.3389/fnins.2014.00119 Text en Copyright © 2014 Dolležal, Brechmann, Klump and Deike. http://creativecommons.org/licenses/by/3.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
spellingShingle Psychology
Dolležal, Lena-Vanessa
Brechmann, André
Klump, Georg M.
Deike, Susann
Evaluating auditory stream segregation of SAM tone sequences by subjective and objective psychoacoustical tasks, and brain activity
title Evaluating auditory stream segregation of SAM tone sequences by subjective and objective psychoacoustical tasks, and brain activity
title_full Evaluating auditory stream segregation of SAM tone sequences by subjective and objective psychoacoustical tasks, and brain activity
title_fullStr Evaluating auditory stream segregation of SAM tone sequences by subjective and objective psychoacoustical tasks, and brain activity
title_full_unstemmed Evaluating auditory stream segregation of SAM tone sequences by subjective and objective psychoacoustical tasks, and brain activity
title_short Evaluating auditory stream segregation of SAM tone sequences by subjective and objective psychoacoustical tasks, and brain activity
title_sort evaluating auditory stream segregation of sam tone sequences by subjective and objective psychoacoustical tasks, and brain activity
topic Psychology
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4047832/
https://www.ncbi.nlm.nih.gov/pubmed/24936170
http://dx.doi.org/10.3389/fnins.2014.00119
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