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Rippled-spectrum resolution dependence on frequency: Estimates obtained by discrimination from rippled and nonrippled
Olga N Milekhina1, Dmitry I Nechaev1, Alexander Ya Supin1
1Institute of Ecology and Evolution, Russian Academy of Sciences, Moscow 119071, Russia.
The Journal of the Acoustical Society of America
|November 2, 2019
Summary
Spectral ripple resolution in hearing depends on the measurement method. Using different reference signals reveals whether excitation-pattern or temporal-processing mechanisms dominate spectral analysis.
Area of Science:
- Auditory perception
- Psychoacoustics
- Hearing science
Background:
- Spectral ripple resolution is a key measure of auditory spectral resolution.
- Different measurement paradigms may involve distinct auditory processing mechanisms, leading to varied results.
- Understanding these mechanisms is crucial for accurate hearing assessment.
Purpose of the Study:
- To investigate how measurement paradigm influences spectral ripple-density resolution.
- To differentiate the contributions of excitation-pattern and temporal-processing mechanisms in spectral analysis.
- To assess spectral resolution across different auditory frequency bands.
Main Methods:
- Measured ripple-density resolution in normal-hearing listeners across 0.5, 1, 2, and 4 kHz frequency bands.
- Employed two discrimination paradigms: comparing a test signal to a rippled reference and to a nonrippled reference.
- Compared experimental data against predictions from excitation-pattern and temporal-processing models.
Main Results:
- Spectral resolution varied with signal frequency, particularly for the nonrippled reference paradigm (8.8 to 34.2 ripples/oct).
- Data from the rippled reference paradigm aligned with the excitation-pattern model.
- Data from the nonrippled reference paradigm aligned with the temporal-processing model.
Conclusions:
- The choice of reference signal significantly impacts the measured spectral ripple-density resolution.
- Ripple-density resolution estimates reflect either excitation-pattern or temporal-processing abilities, depending on the paradigm.
- This highlights the importance of considering measurement methodology in auditory processing studies.
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