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Accounting quantitatively for sensitivity to envelope-based interaural temporal disparities at high frequencies
Leslie R Bernstein1, Constantine Trahiotis
1Department of Neuroscience, University of Connecticut Health Center, Farmington, Connecticut 06030, USA.
The Journal of the Acoustical Society of America
|September 7, 2010
Summary
This study refines models of auditory processing by analyzing how listeners perceive interaural temporal disparities (ITDs) in complex sounds. The normalized interaural correlation, especially with off-frequency listening, best predicts these ITD thresholds.
Area of Science:
- Auditory Neuroscience
- Psychoacoustics
- Signal Processing
Background:
- Bernstein and Trahiotis (2009) studied threshold interaural temporal disparities (ITDs) using raised-sine stimuli.
- An interaural correlation model partially explained ITD data, but overestimated thresholds at specific modulation depths and exponents.
Purpose of the Study:
- Evaluate alternative measures like envelope fourth moment, peakwidth, and deadtime for predicting ITD thresholds.
- Collect new ITD threshold data by systematically varying modulation depth, raised-sine exponent, and modulation frequency.
- Improve models of auditory processing for ITD perception.
Main Methods:
- Quantitative analysis of existing and new threshold ITD data.
- Comparison of predictive accuracy for various envelope-based measures and interaural correlation.
- Factorial design varying stimulus parameters: modulation depth, raised-sine exponent, and modulation frequency.
Main Results:
- The normalized interaural correlation, after peripheral auditory processing, most accurately predicted threshold ITDs.
- Alternative measures (envelope fourth moment, peakwidth, deadtime) showed less predictive power.
- New data confirmed previous findings and model performance.
Conclusions:
- The normalized interaural correlation is a robust predictor of ITD thresholds conveyed by raised-sine envelopes.
- The model's overestimation of ITDs was resolved by considering "off-frequency" auditory filter listening.
- Findings advance our understanding of binaural hearing and auditory signal processing.
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