Left superior temporal gyrus is coupled to attended speech in a cocktail-party auditory scene

Tutkimustuotos: Lehtiartikkeli

Tutkijat

  • Marc Vander Ghinst
  • Mathieu Bourguignon
  • Marc Op de Beeck
  • Vincent Wens
  • Brice Marty
  • Sergio Hassid
  • Georges Choufani
  • Veikko Jousmäki

  • Riitta Hari

  • Patrick Van Bogaert
  • Serge Goldman
  • Xavier De Tiege

Organisaatiot

  • Université Libre de Bruxelles

Kuvaus

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 similar to 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 similar to 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 similar to 0.5 Hz modulations, likely reflecting the attended speech stream within a multitalker auditory scene.

Yksityiskohdat

AlkuperäiskieliEnglanti
Sivut1596-1606
Sivumäärä11
JulkaisuJOURNAL OF NEUROSCIENCE
Vuosikerta36
Numero5
TilaJulkaistu - 3 helmikuuta 2016
OKM-julkaisutyyppiA1 Julkaistu artikkeli, soviteltu

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