Keeping track of sound objects in space: The contribution of early-stage auditory areas.

Details

Serval ID
serval:BIB_928E0C6B5F88
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Keeping track of sound objects in space: The contribution of early-stage auditory areas.
Journal
Hearing research
Author(s)
Da Costa S., Clarke S., Crottaz-Herbette S.
ISSN
1878-5891 (Electronic)
ISSN-L
0378-5955
Publication state
Published
Issued date
09/2018
Peer-reviewed
Oui
Volume
366
Pages
17-31
Language
english
Notes
Publication types: Journal Article
Publication Status: ppublish
Abstract
The influential dual-stream model of auditory processing stipulates that information pertaining to the meaning and to the position of a given sound object is processed in parallel along two distinct pathways, the ventral and dorsal auditory streams. Functional independence of the two processing pathways is well documented by conscious experience of patients with focal hemispheric lesions. On the other hand there is growing evidence that the meaning and the position of a sound are combined early in the processing pathway, possibly already at the level of early-stage auditory areas. Here, we investigated how early auditory areas integrate sound object meaning and space (simulated by interaural time differences) using a repetition suppression fMRI paradigm at 7 T. Subjects listen passively to environmental sounds presented in blocks of repetitions of the same sound object (same category) or different sounds objects (different categories), perceived either in the left or right space (no change within block) or shifted left-to-right or right-to-left halfway in the block (change within block). Environmental sounds activated bilaterally the superior temporal gyrus, middle temporal gyrus, inferior frontal gyrus, and right precentral cortex. Repetitions suppression effects were measured within bilateral early-stage auditory areas in the lateral portion of the Heschl's gyrus and posterior superior temporal plane. Left lateral early-stages areas showed significant effects for position and change, interactions Category x Initial Position and Category x Change in Position, while right lateral areas showed main effect of category and interaction Category x Change in Position. The combined evidence from our study and from previous studies speaks in favour of a position-linked representation of sound objects, which is independent from semantic encoding within the ventral stream and from spatial encoding within the dorsal stream. We argue for a third auditory stream, which has its origin in lateral belt areas and tracks sound objects across space.
Keywords
7T, Early-stage auditory areas, Human fMRI, Repetition suppression, Sound recognition and localization, Three-stream model
Pubmed
Web of science
Create date
21/04/2018 9:58
Last modification date
20/08/2019 15:55
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