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

Journal Article (Journal Article)

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.

Full Text

Duke Authors

Cited Authors

  • Dheerendra, P; Barascud, N; Kumar, S; Overath, T; Griffiths, TD

Published Date

  • November 2021

Published In

Volume / Issue

  • 54 / 9

Start / End Page

  • 7274 - 7288

PubMed ID

  • 34549472

Electronic International Standard Serial Number (EISSN)

  • 1460-9568

International Standard Serial Number (ISSN)

  • 0953-816X

Digital Object Identifier (DOI)

  • 10.1111/ejn.15471


  • eng