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Auditory spatial resolution in horizontal, vertical, and diagonal planes.

D Wesley Grantham1, Benjamin W Y Hornsby, Eric A Erpenbeck

  • 1Vanderbilt Bill Wilkerson Center for Otolaryngology and Communication Sciences, Department of Hearing and Speech Sciences, VUMC, Nashville, Tennessee 37232-8700, USA. d.wesley.grantham@vanderbilt.edu

The Journal of the Acoustical Society of America
|August 29, 2003
PubMed
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This study investigated spatial hearing in different planes. Auditory spatial resolution was poorest in the vertical plane and best in the horizontal plane, suggesting distinct processing for different sound source locations.

Area of Science:

  • Auditory Neuroscience
  • Psychoacoustics
  • Human Perception

Background:

  • Accurate sound source localization is crucial for auditory perception and interaction with the environment.
  • Previous research has established thresholds for minimum audible angle (MAA) and minimum audible movement angle (MAMA) primarily in the horizontal plane.
  • Understanding spatial hearing in three dimensions, including vertical and diagonal planes, is essential for a comprehensive model of auditory spatial resolution.

Purpose of the Study:

  • To measure minimum audible angle (MAA) and minimum audible movement angle (MAMA) thresholds in horizontal, vertical, and diagonal planes.
  • To investigate the influence of different frequency bands (wideband, high-pass, low-pass) on spatial hearing thresholds.
  • To compare findings with previous studies and test the hypothesis of independent horizontal and vertical plane systems contributing to diagonal plane performance.

Related Experiment Videos

Main Methods:

  • Utilized a pseudovirtual technique with KEMAR's recorded ear signals played back through insert earphones.
  • Measured MAA and MAMA thresholds for wideband, high-pass, and low-pass noise stimuli.
  • Selected subjects with exceptional vertical-plane MAA performance for the main study.

Main Results:

  • Auditory spatial resolution thresholds were lowest in the horizontal plane, intermediate in the diagonal plane, and highest in the vertical plane across all filter conditions.
  • These results largely mirrored previous findings but differed in diagonal plane performance, which was not as good as the horizontal plane in this study.
  • Diagonal plane performance may rely on combined horizontal (interaural differences) and vertical (pinna-based spectral changes) processing, with potential underutilization of cues in this study.

Conclusions:

  • Auditory spatial resolution varies significantly across different planes, with the vertical plane posing the greatest challenge.
  • The findings support a model where horizontal and vertical auditory processing systems contribute to spatial awareness in diagonal planes.
  • Factors such as image externalization and visual context may influence the ability to utilize spatial auditory cues in diagonal planes.