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Temporal integration of loudness as a function of level

M Florentine1, S Buus, T Poulsen

  • 1Communication Research Laboratory, Department of Speech-Language Pathology and Audiology, Northeastern University, Boston, Massachusetts 02115, USA.

The Journal of the Acoustical Society of America
|March 1, 1996
PubMed
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Loudness integration in humans shows that how long a sound lasts affects its perceived loudness, with this effect changing non-monotonically with sound level. This suggests loudness perception may relate to the nonlinear function of the basilar membrane.

Area of Science:

  • Auditory Neuroscience
  • Psychoacoustics

Background:

  • Temporal integration of loudness is crucial for auditory perception.
  • Understanding how sound level influences temporal integration is key to auditory models.

Purpose of the Study:

  • To compare temporal integration of loudness for tones and noises across a wide range of sound levels.
  • To investigate the non-monotonic relationship between sound level and temporal integration.

Main Methods:

  • Measured absolute thresholds and equal-loudness levels for 5-, 30-, and 200-ms stimuli (1-kHz tones and broadband noises).
  • Utilized an adaptive, two-interval, two-alternative forced-choice procedure.
  • Tested levels from 5 to 80 dB SL for noises and 5 to 90 dB SL for tones in six normal-hearing listeners.

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Main Results:

  • Temporal integration, defined as the level difference between equally loud 5- and 200-ms stimuli, varied non-monotonically with level.
  • Integration peaked at 18-19 dB for specific levels and decreased at higher levels (10 dB for tones, 13 dB for noises).
  • Data for tones agreed with existing literature; noise data showed level-dependent differences compared to previous studies.

Conclusions:

  • The amount of temporal loudness integration is dependent on sound level in a non-monotonic manner.
  • Findings suggest that the growth of loudness may be partly explained by the nonlinear input/output function of the basilar membrane.
  • The study provides new insights into loudness perception for noise stimuli.