English
 
User Manual Privacy Policy Disclaimer Contact us
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  Detecting tones in complex auditory scenes

Giani, A., Belardinelli, P., Ortiz, E., Kleiner, M., & Noppeney, U. (2015). Detecting tones in complex auditory scenes. NeuroImage, 122, 203-213. doi:10.1016/j.neuroimage.2015.07.001.

Item is

Basic

show hide
Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002A-43AB-5 Version Permalink: http://hdl.handle.net/21.11116/0000-0000-B4A1-E
Genre: Journal Article

Files

show Files

Locators

show
hide
Description:
-

Creators

show
hide
 Creators:
Giani, AS1, 2, Author              
Belardinelli, P, Author
Ortiz, E, Author
Kleiner, M2, Author              
Noppeney, U1, 2, Author              
Affiliations:
1Research Group Cognitive Neuroimaging, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497804              
2Department Human Perception, Cognition and Action, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497797              

Content

show
hide
Free keywords: -
 Abstract: In everyday life, our auditory system is bombarded with many signals in complex auditory scenes. Limited processing capacities allow only a fraction of these signals to enter perceptual awareness. This magnetoencephalography (MEG) study used informational masking to identify the neural mechanisms that enable auditory awareness. On each trial, participants indicated whether they detected a pair of sequentially presented tones (i.e., the target) that were embedded within a multi-tone background. We analysed MEG activity for ‘hits’ and ‘misses’, separately for the first and second tones within a target pair. Comparing physically identical stimuli that were detected or missed provided insights into the neural processes underlying auditory awareness. While the first tone within a target elicited a stronger early P50m on hit trials, only the second tone evoked a negativity at 150 ms, which may index segregation of the tone pair from the multi-tone background. Notably, a later sustained deflection peaking around 300 and 500 ms (P300m) was the only component that was significantly amplified for both tones, when they were detected pointing towards its key role in perceptual awareness. Additional Dynamic Causal Modelling analyses indicated that the negativity at 150 ms underlying auditory stream segregation is mediated predominantly via changes in intrinsic connectivity within auditory cortices. By contrast, the later P300m response as a signature of perceptual awareness relies on interactions between parietal and auditory cortices. In conclusion, our results suggest that successful detection and hence auditory awareness of a two-tone pair within complex auditory scenes rely on recurrent processing between auditory and higher-order parietal cortices.

Details

show
hide
Language(s):
 Dates: 2015-11
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: DOI: 10.1016/j.neuroimage.2015.07.001
BibTex Citekey: GianiBOKN2015
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: NeuroImage
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: -
Pages: - Volume / Issue: 122 Sequence Number: - Start / End Page: 203 - 213 Identifier: -