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Auditory distance perception in front and rear space.

Elena Aggius-Vella1, Monica Gori2, Claudio Campus2

  • 1Unit for Visually Impaired People (U-VIP), Center for Human Technologies, Fondazione Istituto Italiano di Tecnologia, Genoa, Italy; Institute for Mind, Brain and Technology Ivcher School of Psychology Inter-Disciplinary Center (IDC), Herzeliya, Israel.

Hearing Research
|February 27, 2022
PubMed
Summary
This summary is machine-generated.

Listeners better discriminate sound source distance in front than behind them. This suggests early visual input is crucial for calibrating auditory distance perception, especially for sounds originating from the front.

Keywords:
AuditoryDistanceDistance perceptionSound localizationSpatial hearing

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Area of Science:

  • Auditory Perception
  • Psychoacoustics
  • Spatial Hearing

Background:

  • Sound source distance estimation relies on acoustic cues like sound level and direct-to-reverberant ratio.
  • Auditory distance perception may differ for sounds in front versus behind the listener due to visual and pinna filtering differences.

Purpose of the Study:

  • To investigate auditory distance discrimination in front and rear auditory space.
  • To compare performance between auditory spatial bisection and minimum audible distance discrimination (MADD) tasks.

Main Methods:

  • Participants performed auditory spatial bisection and MADD tasks with sounds presented in front and rear space.
  • The bisection task involved judging a probe sound's distance relative to two reference sounds.
  • MADD involved identifying which of two successive sounds was closer.

Main Results:

  • Performance in auditory distance discrimination was worse for rear space compared to front space.
  • No significant interaction was found between task type and spatial region (front vs. rear).
  • The point of subjective equality (PSE) in the bisection task showed a slight bias towards the body but did not differ in magnitude between front and rear space.

Conclusions:

  • Visual information likely plays a critical role in calibrating auditory distance representations for front space early in life.
  • The poorer performance for rear space suggests a reliance on visual calibration for accurate auditory distance perception.