Sensitivity to an illusion of sound location in human auditory cortex

Nathan C. Higgins, Susan A. McLaughlin, Sandra Da Costa, G. Christopher Stecker

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Human listeners place greater weight on the beginning of a sound compared to the middle or end when determining sound location, creating an auditory illusion known as the Franssen effect. Here, we exploited that effect to test whether human auditory cortex (AC) represents the physical vs. perceived spatial features of a sound. We used functional magnetic resonance imaging (fMRI) to measure AC responses to sounds that varied in perceived location due to interaural level differences (ILD) applied to sound onsets or to the full sound duration. Analysis of hemodynamic responses in AC revealed sensitivity to ILD in both full-cue (veridical) and onset-only (illusory) lateralized stimuli. Classification analysis revealed regional differences in the sensitivity to onset-only ILDs, where better classification was observed in posterior compared to primary AC. That is, restricting the ILD to sound onset—which alters the physical but not the perceptual nature of the spatial cue—did not eliminate cortical sensitivity to that cue. These results suggest that perceptual representations of auditory space emerge or are refined in higher-order AC regions, supporting the stable perception of auditory space in noisy or reverberant environments and forming the basis of illusions such as the Franssen effect.

Original languageEnglish (US)
Article number35
JournalFrontiers in Systems Neuroscience
Volume11
DOIs
StatePublished - May 23 2017
Externally publishedYes

Keywords

  • Auditory cortex (AC)
  • Auditory illusion
  • Auditory perception
  • Binaural hearing
  • FMRI neuroimaging
  • Spatial localization

ASJC Scopus subject areas

  • Neuroscience (miscellaneous)
  • Developmental Neuroscience
  • Cognitive Neuroscience
  • Cellular and Molecular Neuroscience

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