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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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Elevation localization and head-related transfer function analysis at low frequencies.

V R Algazi1, C Avendano, R O Duda

  • 1Center for Image Processing and Integrated Computing, University of California, Davis 95616, USA.

The Journal of the Acoustical Society of America
|April 17, 2001
PubMed
Summary

Accurate sound elevation perception is possible with low-frequency sounds, challenging prior beliefs. Head and torso diffraction provide crucial low-frequency cues for estimating sound source elevation.

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Area of Science:

  • Acoustics
  • Psychoacoustics
  • Auditory Neuroscience

Background:

  • Monaural spectral features from pinna diffraction are key for sound elevation cues, typically above 3 kHz.
  • It was widely believed that accurate elevation perception necessitates wideband sound sources.

Purpose of the Study:

  • To investigate the ability of human subjects to perceive sound source elevation using low-frequency stimuli.
  • To identify the acoustic cues responsible for elevation perception with low-frequency sounds.

Main Methods:

  • Psychoacoustic experiments using low-pass filtered noise bursts (below 3 kHz) processed with individualized head-related transfer functions (HRTFs).
  • Subjects reported elevation angles around cones of confusion.
  • Analysis of HRTFs to identify low-frequency elevation-dependent features.

Main Results:

  • Elevation estimation accuracy was reduced compared to wideband stimuli, varying with azimuth.
  • Performance degradation was most significant in the median plane.
  • Surprisingly accurate elevation perception was achieved for sources away from the median plane.

Conclusions:

  • Low-frequency sound elevation perception is feasible, contrary to previous assumptions.
  • Head diffraction and torso reflections are primary sources of low-frequency elevation cues.
  • Simple geometrical models of the head and torso can explain these low-frequency cues.