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Interaural correlation sensitivity.

J F Culling1, H S Colburn, M Spurchise

  • 1Department of Biomedical Engineering, Boston University, Massachusetts 02215, USA. cullingj@cardiff.ac.uk

The Journal of the Acoustical Society of America
|August 25, 2001
PubMed
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Listeners are better at detecting small changes in interaural correlation for correlated noise bands, especially at lower frequencies. This sensitivity decreases with increasing frequency and is influenced by flanking noise bands.

Area of Science:

  • Auditory perception
  • Psychoacoustics
  • Binaural hearing

Background:

  • Interaural correlation is a key cue for sound localization and spatial hearing.
  • Understanding sensitivity to interaural correlation differences is crucial for explaining binaural hearing mechanisms.

Purpose of the Study:

  • To measure human sensitivity to differences in interaural correlation for narrow bands of noise.
  • To investigate the influence of flanking noise bands on this sensitivity.
  • To model the relationship between correlation sensitivity and frequency.

Main Methods:

  • A two-interval, two-alternative forced-choice (2IFC) task was used to measure sensitivity (d').
  • Experiments were conducted at six frequencies (250-1500 Hz) using 1.3-ERB-wide noise bands.

Related Experiment Videos

  • Two conditions were tested: narrow-band noise alone and noise bands "fringed" with correlated noise.

    • Main Results:

    • Sensitivity to interaural correlation differences was higher for values near 1 than near 0 at low frequencies.
    • The "fringed" condition reduced the difference in sensitivity between high and low correlation values.
    • Sensitivity decreased with increasing frequency, particularly in the "fringed" condition.
    • A linear relationship was observed when plotting sensitivity against equivalent signal-to-noise ratio (SNR).

    Conclusions:

    • Human binaural hearing is more sensitive to changes in high interaural correlation values.
    • Flanking noise bands can alter sensitivity to interaural correlation.
    • The findings provide a basis for predicting how the binaural system processes complex sounds in noise.