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Temporal integration of loudness under partial masking

M Florentine1, S Buus, M Robinson

  • 1Department of Speech-Language Pathology and Audiology, (133FR), Northeasern University, Boston, Massachusetts 02115 USA.

The Journal of the Acoustical Society of America
|August 26, 1998
PubMed
Summary
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The loudness ratio between tones of different durations is not constant across all sound levels. Temporal integration, the difference in level for equally loud tones, peaks at moderate levels and changes with background noise.

Area of Science:

  • Psychoacoustics
  • Auditory Perception
  • Loudness Perception

Background:

  • The relationship between sound pressure level (SPL) and perceived loudness is fundamental to auditory science.
  • Temporal integration, the brain's ability to sum acoustic energy over time, influences loudness perception, especially for brief sounds.

Purpose of the Study:

  • To investigate the hypothesis that the loudness ratio between equal-SPL tones of different durations (5 ms vs. 200 ms) remains constant across all sound levels.
  • To quantify how temporal integration varies with sound level in quiet and in the presence of broadband noise.

Main Methods:

  • Detection thresholds and equal-loudness levels were measured using adaptive psychophysical procedures.
  • Stimuli included 5-ms and 200-ms tones presented in quiet and with broadband noise maskers at various SPLs.

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  • Data were collected from six listeners with normal hearing.

    • Main Results:

    • Temporal integration varied non-monotonically with level, peaking at moderate levels (around 27 dB difference) and decreasing at very low and high levels.
    • In quiet, temporal integration was greatest around 58 dB SPL for the 5-ms tone.
    • In noise, the maximum temporal integration decreased with increasing masker level, and its level dependence shifted.

    Conclusions:

    • The equal-loudness-ratio hypothesis is generally supported, but with deviations, particularly under intense masking conditions.
    • Intense masking may alter the perceived loudness ratio between short and long tones, suggesting limitations in simple loudness scaling models.