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Binaural advantage for sound pattern identification

G Kidd1, C R Mason, T L Rohtla

  • 1Department of Communication Disorders, Boston University, Massachusetts 02215, USA.

The Journal of the Acoustical Society of America
|October 1, 1995
PubMed
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This study investigated how listeners identify complex sound patterns under different noise conditions. Binaural hearing provides a significant advantage, especially with informational masking, impacting speech intelligibility.

Area of Science:

  • Auditory perception
  • Psychoacoustics
  • Signal processing

Background:

  • Listeners identify patterns of tone bursts.
  • Masking-level differences (MLDs) and identification-level differences (IDLDs) measure binaural advantage.
  • Performance varies with frequency and masker type.

Purpose of the Study:

  • To examine the binaural advantage in auditory pattern identification.
  • To investigate the effects of frequency range and masker type on MLDs and IDLDs.
  • To understand factors influencing speech intelligibility in noise.

Main Methods:

  • Listeners identified six patterns of tone bursts under two interaural conditions (NoSo, NoSπ).
  • Maskers included Gaussian noise and informational noise.

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  • MLDs and IDLDs were measured at different frequencies and signal-to-noise ratios.

    • Main Results:

    • MLDs and IDLDs were larger at 500 Hz (11-13 dB) than at 3000 Hz (1-3 dB).
    • A broad frequency range reduced binaural advantage, similar to speech intelligibility findings.
    • Informational masking significantly reduced binaural advantage for pattern identification.

    Conclusions:

    • Binaural hearing significantly aids auditory pattern identification, particularly under informational masking.
    • Frequency range and masker type critically influence the binaural advantage.
    • Findings have implications for understanding speech intelligibility in complex auditory environments.