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Related Experiment Videos

Auditory filter nonlinearity across frequency using simultaneous notched-noise masking.

Richard J Baker1, Stuart Rosen

  • 1Human Communication and Deafness Division, School of Psychological Science, Humanities Devas Street, University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom. richard.baker@manchester.ac.uk

The Journal of the Acoustical Society of America
|February 4, 2006
PubMed
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Psychoacoustic masking experiments reveal how auditory filter shapes change with stimulus intensity in normal hearing. These findings quantify cochlear function across different frequencies and sound levels.

Area of Science:

  • Auditory Neuroscience
  • Psychoacoustics
  • Human Hearing Physiology

Background:

  • Psychoacoustic masking experiments are crucial for understanding cochlear function.
  • Auditory filter shape is a key indicator of cochlear processing.
  • Previous research has explored auditory filters, but changes with stimulus level require further characterization.

Purpose of the Study:

  • To characterize the dynamic changes in auditory filter shape with varying stimulus levels in normal-hearing listeners.
  • To quantify how auditory filter parameters, including tip-tail gain, vary across frequency (0.25-6 kHz) and sound pressure level (SPL).
  • To develop simple equations describing these level- and frequency-dependent filter shape modifications.

Main Methods:

  • Utilized simultaneous notched-noise masking experiments with normal-hearing participants.

Related Experiment Videos

  • Employed a range of fixed signal levels (30-70 dB SPL) and masker levels (20-50 dB SPL spectrum level) at specific frequencies.
  • Fitted individual listener data using two auditory filter shape models: rounded exponential (roex) and a model by Glasberg and Moore (2000).

    • Main Results:

    • Both fitted models demonstrated that auditory filter shapes change with stimulus level.
    • A consistent finding was the increase in tip-tail gain as stimulus frequency increased.
    • The study successfully described parameter changes with simple equations, quantifying level and frequency effects.

    Conclusions:

    • Auditory filter shapes in normal-hearing listeners are adaptable to stimulus intensity.
    • The tip-tail gain of auditory filters increases with frequency, indicating frequency-dependent processing.
    • The developed equations provide a quantitative framework for understanding cochlear processing across different sound levels and frequencies.