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Related Experiment Videos

Lateralization of large interaural delays

J E Mossop1, J F Culling

  • 1University Laboratory of Physiology, Oxford, United Kingdom.

The Journal of the Acoustical Society of America
|September 24, 1998
PubMed
Summary

Listeners can distinguish sound laterality even with large interaural time delays (ITDs). This ability extends beyond typical free-field conditions, particularly with filtered sounds, revealing robust auditory processing capabilities.

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Area of Science:

  • Auditory perception
  • Psychoacoustics
  • Binaural hearing

Background:

  • Interaural time delays (ITDs) are crucial cues for sound localization.
  • Understanding the limits of ITD processing is essential for explaining auditory spatial perception.

Purpose of the Study:

  • To investigate the maximum interaural time delays (ITDs) listeners can interpret for sound laterality.
  • To determine how high-pass filtering affects the discrimination of large ITDs.

Main Methods:

  • Experiment 1: Measured just-noticeable differences (jnds) for ITDs up to 3000 microseconds using an adaptive procedure.
  • Experiment 2: Assessed left/right discrimination for ITDs up to 10,000 microseconds with varying high-pass cutoff frequencies (0-3000 Hz).

Main Results:

  • Just-noticeable differences (jnds) for ITDs increased with reference ITD, then rose sharply and plateaued.
  • Good left/right discrimination was achieved for broadband and 500 Hz high-pass filtered stimuli up to 10,000 microseconds ITD.
  • Discrimination remained significant for ITDs up to 3000 microseconds even with higher high-pass cutoffs.

Conclusions:

  • Auditory laterality cues are discriminable at much larger ITDs than typically encountered in free-field listening.
  • This discrimination is robust even without low-frequency information (below 3 kHz).
  • Findings suggest a broader capacity for processing spatial auditory information than previously assumed.

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