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      Left Superior Temporal Gyrus Is Coupled to Attended Speech in a Cocktail-Party Auditory Scene.

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          Abstract

          Using a continuous listening task, we evaluated the coupling between the listener's cortical activity and the temporal envelopes of different sounds in a multitalker auditory scene using magnetoencephalography and corticovocal coherence analysis. Neuromagnetic signals were recorded from 20 right-handed healthy adult humans who listened to five different recorded stories (attended speech streams), one without any multitalker background (No noise) and four mixed with a "cocktail party" multitalker background noise at four signal-to-noise ratios (5, 0, -5, and -10 dB) to produce speech-in-noise mixtures, here referred to as Global scene. Coherence analysis revealed that the modulations of the attended speech stream, presented without multitalker background, were coupled at ∼0.5 Hz to the activity of both superior temporal gyri, whereas the modulations at 4-8 Hz were coupled to the activity of the right supratemporal auditory cortex. In cocktail party conditions, with the multitalker background noise, the coupling was at both frequencies stronger for the attended speech stream than for the unattended Multitalker background. The coupling strengths decreased as the Multitalker background increased. During the cocktail party conditions, the ∼0.5 Hz coupling became left-hemisphere dominant, compared with bilateral coupling without the multitalker background, whereas the 4-8 Hz coupling remained right-hemisphere lateralized in both conditions. The brain activity was not coupled to the multitalker background or to its individual talkers. The results highlight the key role of listener's left superior temporal gyri in extracting the slow ∼0.5 Hz modulations, likely reflecting the attended speech stream within a multitalker auditory scene.

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          Author and article information

          Journal
          J. Neurosci.
          The Journal of neuroscience : the official journal of the Society for Neuroscience
          1529-2401
          0270-6474
          Feb 3 2016
          : 36
          : 5
          Affiliations
          [1 ] Laboratoire de Cartographie fonctionnelle du Cerveau, UNI-ULB Neuroscience Institute, Université libre de Bruxelles, 1070 Brussels, Belgium, Service d'ORL et de chirurgie cervico-faciale, ULB-Hôpital Erasme, Université libre de Bruxelles, 1070 Brussels, Belgium, Marc.Vander.Ghinst@erasme.ulb.ac.be.
          [2 ] Laboratoire de Cartographie fonctionnelle du Cerveau, UNI-ULB Neuroscience Institute, Université libre de Bruxelles, 1070 Brussels, Belgium, Brain Research Unit, Department of Neuroscience and Biomedical Engineering, Aalto University School of Science, FI-00076-AALTO, Espoo, Finland, and BCBL, Basque Center on Cognition, Brain and Language, 20009 San Sebastian, Spain.
          [3 ] Laboratoire de Cartographie fonctionnelle du Cerveau, UNI-ULB Neuroscience Institute, Université libre de Bruxelles, 1070 Brussels, Belgium.
          [4 ] Service d'ORL et de chirurgie cervico-faciale, ULB-Hôpital Erasme, Université libre de Bruxelles, 1070 Brussels, Belgium.
          [5 ] Brain Research Unit, Department of Neuroscience and Biomedical Engineering, Aalto University School of Science, FI-00076-AALTO, Espoo, Finland, and.
          Article
          36/5/1596
          10.1523/JNEUROSCI.1730-15.2016
          26843641
          Copyright © 2016 the authors 0270-6474/16/361597-11$15.00/0.

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