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

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

da Costa, Sandra  
•
Clarke, Stephanie
•
Crottaz-Herbetter, Sonja
2018
Hearing Research

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.

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Type
research article
DOI
10.1016/j.heares.2018.03.027
Author(s)
da Costa, Sandra  
Clarke, Stephanie
Crottaz-Herbetter, Sonja
Date Issued

2018

Published in
Hearing Research
Volume

366

Start page

17

End page

31

Subjects

CIBM-AIT

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
CIBM  
Available on Infoscience
April 12, 2018
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/145997
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