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Induced loudness reduction as a function of frequency difference between test tone and inducer.

Jeremy Marozeau1, Michael Epstein

  • 1Department of Speech and Language Pathology and Audiology, Northeastern University, Boston, Massachusetts 02115, USA. j.marozeau@neu.edu

Perception & Psychophysics
|June 18, 2008
PubMed
Summary

Induced loudness reduction (ILR) occurs when a loud tone reduces the perceived loudness of a subsequent, softer tone. This study quantifies ILR across various frequency separations, finding it persists even at wide separations.

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Area of Science:

  • Auditory perception
  • Psychoacoustics
  • Human hearing

Background:

  • Induced loudness reduction (ILR) is a psychoacoustic phenomenon where a high-intensity tone (inducer) decreases the perceived loudness of a subsequent, moderate-intensity tone (test tone).
  • The magnitude of ILR is known to be dependent on the frequency separation between the inducer and test tones, generally decreasing as this separation increases.
  • The precise relationship between frequency separation and the extent of ILR, particularly at wider separations, remains incompletely characterized.

Purpose of the Study:

  • To investigate and precisely map the course of induced loudness reduction (ILR) as a function of increasing frequency separation between an inducer tone and a test tone.
  • To determine the extent to which ILR persists at larger frequency differences, specifically exploring its presence beyond established boundaries.

Main Methods:

  • Two experiments were conducted to measure ILR.
  • Experiment 1 involved a 2.5-kHz, 80-dB-SPL inducer and a test tone whose frequency was systematically varied from 800 Hz to 6 kHz.
  • Experiment 2 utilized the same inducer but tested specific test tone frequencies at 2, 2.5, 3, and 4 kHz.

Main Results:

  • Both experimental designs demonstrated that induced loudness reduction (ILR) is observable even when the frequency separation between the inducer and test tones is substantial.
  • Specifically, significant ILR was measured at frequency separations extending up to four critical bands.
  • The data provide a more detailed understanding of how ILR diminishes with increasing frequency separation.

Conclusions:

  • Induced loudness reduction (ILR) is not limited to narrow frequency separations and can occur across a wider range than previously assumed.
  • The findings suggest that the neural mechanisms underlying ILR are engaged even by tones with considerable frequency differences.
  • This research refines our understanding of the frequency-dependent characteristics of auditory adaptation and loudness perception.