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Spectral interference in a binaural detection task.

L R Bernstein1

  • 1Center for Neurological Sciences, University of Connecticut Health Center, Farmington 06032.

The Journal of the Acoustical Society of America
|March 1, 1991
PubMed
Summary
This summary is machine-generated.

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Auditory interference can degrade the ability to detect sound changes, especially when the interfering sound is presented simultaneously with the target sound. Continuous interferers have less impact than gated ones, suggesting distinct processing mechanisms.

Area of Science:

  • Auditory Neuroscience
  • Psychoacoustics

Background:

  • Sensitivity to interaural disparities can be impaired by sounds in other spectral regions.
  • Masking-level difference (MLD) paradigms are used to study binaural hearing.

Purpose of the Study:

  • To investigate if spectral interference degrades performance in a binaural MLD paradigm.
  • To assess the impact of a spectrally remote tone (interferer) on the detection of an 800-Hz signal.

Main Methods:

  • Detection thresholds for NoSo (signal and noise in-phase) and NoSπ (signal out-of-phase) conditions were measured.
  • An 800-Hz signal was presented in broadband noise with or without a 400-Hz interferer.
  • The interferer was presented with a 180-degree interaural phase disparity, either gated or continuous.

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Main Results:

  • A gated 400-Hz interferer at 80 dB SPL increased NoSπ thresholds by approximately 7 dB.
  • Interferer level and continuous presentation modulated the magnitude of the threshold increase.
  • NoSo thresholds were minimally affected, while reversing signal and interferer roles caused smaller degradations.

Conclusions:

  • Spectral interference can impair binaural detection, particularly under conditions requiring precise interaural timing.
  • The impact of interference depends on its temporal presentation (gated vs. continuous) and level.
  • Findings suggest a link between interference processing and auditory source segregation mechanisms.