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

Dheerendra, P. , Barascud, N., Kumar, S., Overath, T. and Griffiths, T. D. (2021) Dynamics underlying auditory‐object‐boundary detection in primary auditory cortex. European Journal of Neuroscience, 54(9), pp. 7274-7288. (doi: 10.1111/ejn.15471) (PMID:34549472)

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 spectro-temporal statistics. We collected magnetoencephalographic (MEG) data from human volunteers and observed a slow (<1 Hz) post boundary drift in the neuro-magnetic signal. The response evoking this drift signal was source localized close to Heschl's Gyrus (HG) bilaterally, which is in agreement with a previous 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.

• Item Type: Articles
• Additional Information: This research was funded by Wellcome Trust PhD studentship to P.D. (WT102561/Z/13/Z), Wellcome Trust Senior Clinical Fellowship awarded to T.D.G. (WT106964MA).
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Dheerendra, Dr Pradeep

Creator Roles

Dheerendra, P.: Formal analysis, Methodology, Visualization, Writing – original draft, Writing – review and editing

• Authors: Dheerendra, P., Barascud, N., Kumar, S., Overath, T., and Griffiths, T. D.
• College/School: College of Medical Veterinary and Life Sciences > School of Psychology & Neuroscience
• Journal Name: European Journal of Neuroscience
• Publisher: Wiley
• ISSN: 0953-816X
• ISSN (Online): 1460-9568
• Published Online: 21 September 2021
• Copyright Holders: Copyright © 2021 The Authors
• First Published: First published in European Journal of Neuroscience 54(9): 7274-7288
• Publisher Policy: Reproduced under a Creative Commons licence