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Dynamics underlying auditory-object-boundary detection in primary auditory cortex

Lookup NU author(s): Dr Pradeep Dheerendra, Dr Sukhbinder Kumar, Tobias Overath, Professor Tim Griffiths

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This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).


Abstract

© 2021 The Authors. European Journal of Neuroscience published by Federation of European Neuroscience Societies and John Wiley & Sons Ltd.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.


Publication metadata

Author(s): Dheerendra P, Barascud N, Kumar S, Overath T, Griffiths TD

Publication type: Article

Publication status: Published

Journal: European Journal of Neuroscience

Year: 2021

Issue: ePub ahead of Print

Online publication date: 21/09/2021

Acceptance date: 16/09/2021

Date deposited: 08/11/2021

ISSN (print): 0953-816X

ISSN (electronic): 1460-9568

Publisher: John Wiley and Sons Inc

URL: https://doi.org/10.1111/ejn.15471

DOI: 10.1111/ejn.15471


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