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Related Experiment Video

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Mapping Cortical Dynamics Using Simultaneous MEG/EEG and Anatomically-constrained Minimum-norm Estimates: an Auditory Attention Example
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Hierarchical Encoding of Attended Auditory Objects in Multi-talker Speech Perception.

James O'Sullivan1, Jose Herrero2, Elliot Smith3

  • 1Department of Electrical Engineering, Columbia University, New York, NY, USA.

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|October 26, 2019
PubMed
Summary

Scientists studied how the human auditory cortex (AC) processes mixed speech. They found the primary AC responds to all speakers, while the nonprimary AC focuses on the attended speaker, aiding auditory object formation.

Keywords:
Heschl’s gyrusauditory objectcocktail partyencodinghierarchicalhuman auditory cortexmulti-talkerspeech perceptionsuperior temporal gyrus

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Area of Science:

  • Neuroscience
  • Auditory Neuroscience
  • Speech Perception

Background:

  • Humans excel at focusing on one speaker amidst background noise.
  • The neural mechanisms of auditory object formation in the human auditory cortex (AC) during multi-talker speech are not fully understood.

Purpose of the Study:

  • To investigate how different regions of the human auditory cortex (AC) represent acoustic components of mixed speech.
  • To elucidate the neural computations underlying auditory object formation in complex acoustic environments.

Main Methods:

  • Invasive electrophysiological recordings were obtained from neurosurgical patients.
  • Recordings were taken from primary and nonprimary AC regions while patients listened to multi-talker speech.
  • Neural responses were analyzed in relation to attended and unattended speakers and acoustic overlap.

Main Results:

  • Primary AC neural sites responded to individual speakers in the mixture, irrespective of attention.
  • Nonprimary AC neural sites showed selective representation of the attended speaker, independent of acoustic overlap.
  • The representation of attended speech in the nonprimary AC was linearly predictable from primary AC activity.

Conclusions:

  • The human auditory cortex (AC) exhibits a hierarchical processing stream for multi-talker speech.
  • Primary AC analyzes individual speech components, while nonprimary AC forms representations of attended auditory objects.
  • These findings reveal neural computations crucial for separating and understanding speech in complex acoustic scenes.