Dynamics underlying auditory‐object‐boundary detection in primary auditory cortex.

Saved in:

Bibliographic Details
Title:	Dynamics underlying auditory‐object‐boundary detection in primary auditory cortex.
Authors:	Dheerendra, Pradeep (AUTHOR), Barascud, Nicolas (AUTHOR), Kumar, Sukhbinder (AUTHOR), Overath, Tobias (AUTHOR), Griffiths, Timothy D. (AUTHOR)
Source:	European Journal of Neuroscience. Nov2021, Vol. 54 Issue 9, p7274-7288. 15p. 1 Diagram, 2 Charts, 2 Graphs.
Subjects:	Auditory cortex, Functional magnetic resonance imaging, Time-frequency analysis
Abstract:	Auditory object analysis requires the fundamental perceptual process of detecting boundaries between auditory objects. However, the dynamics underlying the identification of discontinuities at object boundaries are not well understood. Here, we employed a synthetic stimulus composed of frequency‐modulated ramps known as 'acoustic textures', where boundaries were created by changing the underlying spectrotemporal statistics. We collected magnetoencephalographic (MEG) data from human volunteers and observed a slow (<1 Hz) post‐boundary drift in the neuromagnetic signal. The response evoking this drift signal was source localised close to Heschl's gyrus (HG) bilaterally, which is in agreement with a previous functional magnetic resonance imaging (fMRI) study that found HG to be involved in the detection of similar auditory object boundaries. Time–frequency analysis demonstrated suppression in alpha and beta bands that occurred after the drift signal. [ABSTRACT FROM AUTHOR]
	Copyright of European Journal of Neuroscience is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database:	Psychology and Behavioral Sciences Collection

Description
Abstract:	Auditory object analysis requires the fundamental perceptual process of detecting boundaries between auditory objects. However, the dynamics underlying the identification of discontinuities at object boundaries are not well understood. Here, we employed a synthetic stimulus composed of frequency‐modulated ramps known as 'acoustic textures', where boundaries were created by changing the underlying spectrotemporal statistics. We collected magnetoencephalographic (MEG) data from human volunteers and observed a slow (<1 Hz) post‐boundary drift in the neuromagnetic signal. The response evoking this drift signal was source localised close to Heschl's gyrus (HG) bilaterally, which is in agreement with a previous functional magnetic resonance imaging (fMRI) study that found HG to be involved in the detection of similar auditory object boundaries. Time–frequency analysis demonstrated suppression in alpha and beta bands that occurred after the drift signal. [ABSTRACT FROM AUTHOR]
ISSN:	0953816X
DOI:	10.1111/ejn.15471