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Binaural spectral resolution as a function of interaural masker correlation
Jesko L Verhey1, Marc Nitschmann1
1Department of Experimental Audiology, Otto von Guericke University Magdeburg, Leipziger Strasse 44, 39120 Magdeburg, Germany.
The Journal of the Acoustical Society of America
|September 20, 2014
Summary
This study investigated auditory thresholds using notched-noise maskers with varying interaural correlations. Results show masker correlation significantly impacts auditory filter bandwidth, challenging existing models.
Area of Science:
- Auditory Neuroscience
- Psychoacoustics
- Signal Processing
Background:
- Auditory perception relies on processing complex soundscapes.
- Interaural masker correlation influences binaural hearing thresholds.
- Understanding auditory filter characteristics is crucial for hearing research.
Purpose of the Study:
- To measure auditory thresholds for a 500-Hz sinusoid (Sπ) with different notched-noise masker correlations (Nπ, N0, 0.87).
- To analyze the effect of masker correlation on auditory filter bandwidth.
- To compare findings with existing models of auditory processing.
Main Methods:
- Thresholds for an antiphasic 500-Hz sinusoid (Sπ) were measured.
- Notched-noise maskers with interaural correlations of -1 (Nπ), 1 (N0), and 0.87 were used.
- Gammatone filter bandwidths were calculated from the data.
Main Results:
- The difference in thresholds across masker correlations was largest for zero notch width, decreasing with increasing width.
- Effective filter bandwidths were 85 Hz (NπSπ), 182 Hz (N0Sπ), and 134 Hz (0.87 correlation).
- Findings contradict bandwidening experiment results, suggesting limitations in current models.
Conclusions:
- Masker correlation significantly affects auditory filter bandwidth, with implications for binaural hearing.
- Existing models incorporating detrimental or beneficial across-channel processes failed to predict the observed effects.
- Interaural parameter fluctuations may explain the discrepancies, warranting further investigation.
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