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Related Experiment Videos

Auditory continuity and loudness computation

S McAdams1, M C Botte, C Drake

  • 1Laboratoire de Psychologie Expérimentale (CNRS), Université René Descartes, EPHE, Paris, France. smc@ircam.fr

The Journal of the Acoustical Society of America
|March 26, 1998
PubMed
Summary
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Perceived loudness of intermittent sounds depends on the level difference between sound bursts. This study found loudness matches suggest auditory organization influences loudness computation, not just acoustic levels.

Area of Science:

  • Auditory Perception
  • Psychoacoustics
  • Auditory Scene Analysis

Background:

  • Alternating sound levels can create a continuous sound perception with an intermittent stream.
  • Understanding how perceived loudness of this intermittent stream is affected by level differences is crucial.

Purpose of the Study:

  • To investigate the perceived loudness of an intermittent auditory stream within alternating-level sequences.
  • To determine the influence of level differences between bursts on loudness perception.
  • To test auditory scene analysis hypotheses, specifically the 'old-plus-new' hypothesis.

Main Methods:

  • Listeners adjusted continuous or intermittent comparison sequences to match loudness of perceived continuous or intermittent components in a reference sequence.
  • Experiments compared loudness matches with physical levels of bursts under conditions with and without perceived continuity.

Related Experiment Videos

  • Evaluated predictions from classical loudness models and schema-based models.

    • Main Results:

    • Loudness matches for continuous stimuli approximated lower-level burst physical levels.
    • Loudness matches for intermittent stimuli were significantly below higher-level burst physical levels.
    • Matched levels supported subtraction models but differed from loudness measured in sones, indicating post-organization computation.

    Conclusions:

    • Auditory organization processes significantly influence the computation of perceived loudness.
    • The 'old-plus-new' hypothesis provides a framework for understanding the loudness of intermittent streams.
    • Classical and schema-based loudness models do not fully account for these perceptual effects.