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Related Experiment Videos

Sound localization in noise in normal-hearing listeners.

C Lorenzi1, S Gatehouse, C Lever

  • 1MRC, Institute of Hearing Research (Scottish Section), Royal Glasgow Infirmary, Scotland, United Kingdom.

The Journal of the Acoustical Society of America
|March 25, 1999
PubMed
Summary

Sound localization accuracy in noise depends on masker location and frequency content. Low-frequency cues are more susceptible to noise, especially when the masker is lateralized, impacting directional hearing.

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Area of Science:

  • Auditory perception
  • Psychoacoustics
  • Spatial hearing

Background:

  • Accurate sound localization is crucial for navigating and interacting with the environment.
  • Auditory spatial cues, such as interaural time differences and interaural level differences, are vital for localization.
  • The presence of masker noise can degrade localization performance, particularly in challenging acoustic conditions.

Purpose of the Study:

  • To investigate the impact of masker characteristics on the ability to localize sound in the frontal-horizontal plane.
  • To examine how signal frequency content, signal-to-noise ratio (S/N), and masker location influence localization accuracy.
  • To determine the relative contribution of low- and high-frequency auditory cues for sound localization in noise.

Main Methods:

Related Experiment Videos

  • Normal-hearing listeners localized click trains in quiet and with a white-noise masker.
  • Stimuli were presented under broadband, low-pass, and high-pass filtering conditions.
  • Masker locations varied across azimuth (-90, 0, +90 degrees), with multiple signal-to-noise ratios tested.

Main Results:

  • Localization accuracy remained stable until signal-to-noise ratios of 0-6 dB, then decreased with more adverse ratios.
  • Localization was more affected by noise at +/- 90 degrees azimuth compared to 0 degrees azimuth.
  • Low-frequency cues were less resistant to noise than high-frequency cues when the masker was lateralized.

Conclusions:

  • Low-frequency auditory cues are more vulnerable to masking noise, especially when the noise source is spatially separated from the target.
  • Listeners prioritize high-frequency cues for sound localization when both low- and high-frequency information is available and reliable.
  • Reduced signal detectability in the ipsilateral ear may contribute to impaired localization accuracy with lateralized noise.