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Related Experiment Video

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Sound Source Localization Testing in Single-sided Deafness Following Bone Conduction Intervention
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Sound source localization identification accuracy: Envelope dependencies.

William A Yost1

  • 1Speech and Hearing Science, Arizona State University, P.O. Box 870102, Tempe, Arizona 85287, USA.

The Journal of the Acoustical Society of America
|August 3, 2017
PubMed
Summary
This summary is machine-generated.

Sound source localization accuracy in sound fields is not significantly affected by amplitude modulation. This finding contrasts with headphone studies, suggesting different mechanisms are at play for auditory spatial perception.

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Area of Science:

  • Auditory perception
  • Acoustics
  • Psychoacoustics

Background:

  • Sound source localization is crucial for auditory spatial awareness.
  • Amplitude modulation is known to provide interaural time difference (ITD) cues in headphone-based studies.

Purpose of the Study:

  • To investigate the effect of amplitude modulation on sound source localization accuracy in a front azimuth sound field.
  • To compare the influence of modulation on different sound stimuli, including click trains, modulated noises, and tonal carriers.

Main Methods:

  • Localization accuracy was measured using an identification procedure in a controlled sound field.
  • Stimuli included broadband and filtered clicks, filtered noises, and a 4 kHz tone, with varying click rates and modulation frequencies (16-512 Hz).
  • Modulation types included sinusoidal amplitude modulation and a 'transposed' modulation process.

Main Results:

  • Amplitude modulation had a minimal impact on sound source localization accuracy across all tested stimuli (clicks, noises, tones).
  • Localization accuracy was assessed as a function of click number, click rate, and modulation parameters.
  • No significant improvement in localization was observed with the addition of amplitude modulation in the sound field.

Conclusions:

  • Amplitude modulation does not substantially influence sound source localization accuracy in a free-field sound environment.
  • The findings suggest that mechanisms other than amplitude modulation-based ITDs are dominant for spatial hearing in sound fields.
  • This contrasts with headphone studies where amplitude modulation plays a more significant role in perceived spatial cues.