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Psychophysical evidence for auditory motion parallax.

Daria Genzel1,2, Michael Schutte1, W Owen Brimijoin3

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Humans can use auditory motion parallax, the changing sound cues from self-motion, to judge the distance of sounds. Active self-movement enhances this depth perception, crucial for navigating complex acoustic environments.

Keywords:
auditory updatingdepth perceptiondistance discriminationself-motionspatial hearing

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Area of Science:

  • Auditory perception
  • Psychoacoustics
  • Human spatial orientation

Background:

  • Accurate assessment of sound source distance is ecologically vital for predator-prey interactions.
  • Estimating sound source distance is challenging, particularly in anechoic environments.
  • Visual motion parallax provides reliable depth information through self-motion.

Purpose of the Study:

  • To investigate if humans can utilize auditory motion parallax for sound source depth assessment.
  • To determine the effect of different motion types on auditory depth perception.
  • To explore the interaction between self-motion and binaural processing in complex acoustic scenes.

Main Methods:

  • Formal psychophysical experiments were conducted.
  • Participants' ability to assess relative sound source depths was measured.
  • The influence of active self-motion, passive motion (motion platform), and sound source motion was compared.

Main Results:

  • Humans can exploit auditory motion parallax to determine the relative depths of sound sources.
  • Depth perception accuracy is highest during active self-motion.
  • Performance degrades significantly with passive motion or moving sound sources, despite identical binaural cues.

Conclusions:

  • Auditory motion parallax is a viable perceptual strategy for segregating sound sources in depth.
  • Active self-motion significantly enhances auditory depth perception.
  • Effective spatial assessment of acoustic scenes relies on the integration of self-motion and binaural auditory cues.