Interaction of streaming and attention in human auditory cortex

PloS One
Alexander GutschalkAndrew R Dykstra

Abstract

Serially presented tones are sometimes segregated into two perceptually distinct streams. An ongoing debate is whether this basic streaming phenomenon reflects automatic processes or requires attention focused to the stimuli. Here, we examined the influence of focused attention on streaming-related activity in human auditory cortex using magnetoencephalography (MEG). Listeners were presented with a dichotic paradigm in which left-ear stimuli consisted of canonical streaming stimuli (ABA_ or ABAA) and right-ear stimuli consisted of a classical oddball paradigm. In phase one, listeners were instructed to attend the right-ear oddball sequence and detect rare deviants. In phase two, they were instructed to attend the left ear streaming stimulus and report whether they heard one or two streams. The frequency difference (ΔF) of the sequences was set such that the smallest and largest ΔF conditions generally induced one- and two-stream percepts, respectively. Two intermediate ΔF conditions were chosen to elicit bistable percepts (i.e., either one or two streams). Attention enhanced the peak-to-peak amplitude of the P1-N1 complex, but only for ambiguous ΔF conditions, consistent with the notion that automatic mechanisms for streaming t...Continue Reading

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Citations

Sep 1, 2015·Frontiers in Neuroscience·Susann DeikeAndré Brechmann
Aug 19, 2015·Current Biology : CB·Kevin J P Woods, Josh H McDermott
Jan 4, 2017·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Naoya Itatani, Georg M Klump
Jan 4, 2017·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Andrew R DykstraAlexander Gutschalk
Jul 10, 2018·Annual Review of Neuroscience·David M Schneider, Richard Mooney
Dec 25, 2015·Science Advances·Andrew R Dykstra, Alexander Gutschalk
Jun 27, 2020·PloS One·Huaizhen Cai, Micheal L Dent

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