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Profile analysis: critical bands and duration.

D M Green, C R Mason, G Kidd

    The Journal of the Acoustical Society of America
    |April 1, 1984
    PubMed
    Summary
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    Auditory perception of sound intensity increments is enhanced by broader and denser soundscapes. Shorter sound durations require greater intensity changes for detection, similar to other intensity discrimination tasks.

    Area of Science:

    • Psychoacoustics
    • Auditory perception
    • Signal detection theory

    Background:

    • Understanding how the auditory system detects changes in sound intensity is crucial for explaining auditory perception.
    • Previous research on critical bands suggests limited influence of remote frequencies on signal detection.
    • Intensity discrimination tasks often explore the relationship between stimulus intensity and perception.

    Purpose of the Study:

    • To investigate the detectability of an intensity increment in a multi-component complex sound.
    • To examine the influence of frequency spacing and density of surrounding components on increment detection.
    • To determine the effect of stimulus presentation duration on intensity increment detection.

    Main Methods:

    • Measuring the detection of an intensity increment in the central component of a complex sound.

    Related Experiment Videos

  • Varying the frequency spacing and density of surrounding components.
  • Manipulating the duration of stimulus presentation.
  • Introducing random variations in the overall intensity of the complex sound.

    • Main Results:

    • Increment detection improved with increased range and density of surrounding sound components.
    • This enhancement effect persisted even without random intensity variations (Weber fraction experiment).
    • Shorter presentation durations (under 100 msec) required a larger intensity increment for detection.

    Conclusions:

    • The auditory system's ability to detect intensity increments is influenced by the spectral characteristics of the surrounding sound.
    • Unlike some critical-band findings, remote spectral energy can facilitate increment detection.
    • Duration effects on intensity discrimination align with established findings in auditory perception research.