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Dynamics underlying auditory‐object‐boundary detection in primary auditory cortex
Author(s) -
Dheerendra Pradeep,
Barascud Nicolas,
Kumar Sukhbinder,
Overath Tobias,
Griffiths Timothy D.
Publication year - 2021
Publication title -
european journal of neuroscience
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.346
H-Index - 206
eISSN - 1460-9568
pISSN - 0953-816X
DOI - 10.1111/ejn.15471
Subject(s) - auditory cortex , magnetoencephalography , stimulus (psychology) , functional magnetic resonance imaging , auditory perception , perception , psychology , neuroscience , gyrus , speech recognition , computer science , electroencephalography , cognitive psychology
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.