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The relationship between interaural coherence, interaural level differences, and binaural fusion.

Justin M Aronoff1, Josephine R LaPapa1, Jordan Deutsch1

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Large interaural level differences (ILDs) can promote binaural fusion, even with reduced signal coherence. This suggests ILDs are crucial for integrating auditory information from both ears.

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Area of Science:

  • Auditory Neuroscience
  • Psychoacoustics

Background:

  • Binaural fusion integrates auditory signals from both ears into a single percept.
  • Reduced interaural coherence typically impairs binaural fusion.
  • Interaural level differences (ILDs) are generally robust to coherence changes.

Purpose of the Study:

  • Investigate the interaction between ILDs and binaural fusion under reduced interaural coherence.
  • Determine if large ILDs can facilitate binaural fusion of incoherent signals.

Main Methods:

  • Vocoded auditory stimuli with varying interaural coherence and ILDs were presented.
  • Participants reported perceived auditory image size and lateralization.
  • A second experiment assessed loudness perception in one ear under biased ILDs.

Main Results:

  • Reduced interaural coherence stimuli were fused with large ILDs, but not with 0 dB ILD.
  • Large ILDs promoted binaural fusion of incoherent signals.
  • Presence of large ILDs reduced the ability to discern changes in ear-specific signal intensity.

Conclusions:

  • Significant ILDs can overcome reduced interaural coherence to achieve binaural fusion.
  • Large ILDs foster a more complete binaural fusion, diminishing ear-specific perception.
  • ILDs play a critical role in the robustness of binaural fusion.