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Interaural correlation discrimination from diffuse field reference correlations.

Andreas Walther1, Christof Faller

  • 1Audiovisual Communications Laboratory, École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland. andreas.walther@epfl.ch

The Journal of the Acoustical Society of America
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PubMed
Summary
This summary is machine-generated.

This study measured just noticeable differences in interaural correlation (ρ-jnds) for narrowband noise. Results show discrimination asymmetry depends on the direction of correlation deviation and stimulus bandwidth.

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Area of Science:

  • Acoustics
  • Psychoacoustics
  • Auditory Perception

Background:

  • Interaural correlation is crucial for sound localization and spatial hearing.
  • Previous research indicated asymmetry in discriminating correlation changes from broadband noise.

Purpose of the Study:

  • To quantify just noticeable differences (jnds) in interaural correlation (ρ-jnds) for narrowband noise stimuli.
  • To investigate the influence of reference correlation (ρref) and deviation direction on ρ-jnds.
  • To compare discrimination asymmetry for narrowband versus broadband stimuli.

Main Methods:

  • Utilized a three-interval, three-alternative forced-choice procedure.
  • Measured ρ-jnds for positive and negative deviations from nine narrowband noise reference conditions (1 ERB wide, 165-1500 Hz center frequencies).
  • Reference correlation (ρref) simulated ideal diffuse sound field conditions.

Main Results:

  • Discrimination thresholds for positive correlation deviations followed ρref nonlinearly.
  • Thresholds for negative deviations were further from ρref and showed less trend resemblance.
  • Narrowband stimuli reduced the previously observed asymmetry in correlation discrimination compared to broadband stimuli.

Conclusions:

  • Auditory correlation discrimination asymmetry is influenced by stimulus bandwidth.
  • The pattern of results suggests complex processing of interaural correlation information.
  • Specific frequency regions, particularly where ρref is minimal, show unique discrimination characteristics.