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The Encoding of Sound Source Elevation in the Human Auditory Cortex.

Régis Trapeau1,2, Marc Schönwiesner3,2,4,5

  • 1International Laboratory for Brain, Music and Sound Research, Université de Montréal, Department of Psychology, Outremont, Quebec H2V 4P3, Canada, regis.trapeau@umontreal.ca.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|March 7, 2018
PubMed
Summary
This summary is machine-generated.

The auditory cortex represents sound elevation with broad and narrow tuning functions. This neural representation is shaped by experience with spectral cues and perception, not just physical sound features.

Keywords:
auditory cortexfMRIplasticitysound elevationspatial hearing

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Area of Science:

  • Neuroscience
  • Auditory Perception
  • Sensory Processing

Background:

  • Horizontal sound localization is well-studied, but vertical sound direction representation in the auditory cortex remains largely unknown.
  • Understanding how the brain processes vertical sound cues is crucial for spatial hearing.

Purpose of the Study:

  • To investigate the neural representation of sound elevation in the human auditory cortex.
  • To determine if auditory cortex tuning reflects physical stimulus properties or subjective perception.

Main Methods:

  • High-resolution functional magnetic resonance imaging (fMRI) was used to measure voxelwise sound elevation tuning curves.
  • Participant ear shapes were altered using silicone molds to disrupt elevation perception.
  • Cortical tuning curves were analyzed before, during, and after ear modification.

Main Results:

  • Sound elevation is represented by broad tuning functions favoring lower elevations and secondary narrow tuning functions.
  • Altering ear shape reduced elevation discrimination and flattened cortical tuning curves.
  • Tuning curves and elevation perception recovered with adaptation to modified ears.

Conclusions:

  • Auditory cortex elevation tuning is experience-dependent, influenced by spectral cues and subjective perception.
  • Neural tuning in low-level auditory cortex may underpin the perception of sound elevation.
  • This suggests sensory cortex represents perceptual attributes rather than solely physical stimulus features.