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Auditory filter shapes derived in simultaneous and forward masking

B C Moore, B R Glasberg

    The Journal of the Acoustical Society of America
    |October 1, 1981
    PubMed
    Summary

    This study introduces a new method to compare auditory frequency selectivity in simultaneous and forward masking, minimizing off-frequency listening. Results reveal differences in auditory filter bandwidth and slope between masking types, suggesting auditory suppression effects.

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    Area of Science:

    • Auditory Neuroscience
    • Psychoacoustics
    • Signal Processing in Hearing

    Background:

    • Comparing frequency selectivity in simultaneous and forward masking is crucial for understanding auditory processing.
    • Previous studies may have been confounded by off-frequency listening, complicating interpretations of masking effects.
    • Auditory filters, which shape frequency selectivity, are fundamental to hearing perception.

    Purpose of the Study:

    • To develop and validate a method for comparing frequency selectivity in simultaneous and forward masking, controlling for off-frequency listening.
    • To investigate the influence of signal duration and masker delay on auditory filter characteristics.
    • To quantify differences in auditory filter shapes between simultaneous and forward masking paradigms.

    Main Methods:

    Related Experiment Videos

    • Thresholds for a 1-kHz tone were measured using a notched noise masker across varying notch widths and signal durations (5-45 ms).
    • Experiments involved forward masking with different signal delays and simultaneous masking conditions.
    • Auditory filter bandwidths and slopes were derived by normalizing thresholds to a flat-spectrum noise masker and analyzing notch width effects.

    Main Results:

    • Thresholds decreased with increasing notch width, with a more gradual change at longer signal durations, consistent with masking decay following the auditory filter.
    • Data transformed to account for masker level showed convergence across signal durations, supporting a consistent auditory filter model.
    • Auditory filters derived from forward masking exhibited 17% smaller bandwidths and 48% steeper slopes compared to simultaneous masking.

    Conclusions:

    • The developed method effectively compares frequency selectivity while minimizing off-frequency listening.
    • Masking decay dynamics align with the temporal characteristics of the auditory filter.
    • Observed differences in auditory filter shapes between simultaneous and forward masking are attributed to auditory suppression mechanisms.