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Effects of envelope fluctuations on gap detection.

B R Glasberg1, B C Moore

  • 1Department of Experimental Psychology, University of Cambridge, UK.

Hearing Research
|December 1, 1992
PubMed
Summary

Noise fluctuations can hinder gap detection, especially for those with cochlear hearing loss. Compressing these fluctuations, rather than expanding them, can improve the ability to detect gaps in noise.

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Area of Science:

  • Auditory perception
  • Psychoacoustics
  • Hearing science

Background:

  • Inherent fluctuations in narrowband noise can mask the detection of gaps.
  • Loudness recruitment in cochlear hearing loss may exacerbate these fluctuations, impairing gap detection.

Purpose of the Study:

  • To investigate how altering noise envelope fluctuations affects gap detection thresholds.
  • To determine if simulating loudness recruitment by expanding noise fluctuations worsens gap detection.
  • To assess if compressing noise fluctuations can improve gap detection, particularly for individuals with hearing loss.

Main Methods:

  • Noise bands centered at 1 kHz were processed by raising their envelopes to a power N, altering fluctuation levels.
  • Gap detection thresholds were measured across various noise bandwidths and N values.
  • Stimuli were presented at a low sensation level (20 dB) or in background noise to minimize spectral cue detection.

Main Results:

  • Gap thresholds generally increased with increasing noise envelope fluctuation (N > 1).
  • This effect was more pronounced for narrower noise bandwidths (≤50 Hz).
  • Compressing noise fluctuations (N < 1) improved gap detection for both normal and impaired hearing ears, especially at narrow bandwidths.

Conclusions:

  • Noise envelope fluctuations significantly impact auditory gap detection.
  • Loudness recruitment may contribute to difficulties in detecting gaps in noise for individuals with cochlear hearing loss.
  • Reducing noise fluctuations through compression offers a potential strategy to enhance gap detection abilities.

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