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Interaural-time-difference thresholds for broad band-limited pulses are affected by relative bandwidth not temporal
Paul G Mayo1, Philip C Saunders1, Matthew J Goupell1
1Department of Hearing and Speech Sciences, University of Maryland, College Park, Maryland 20742, USA paulmayo@umd.edu, psaund99@umd.edu, goupell@umd.edu.
JASA Express Letters
|December 20, 2021
Summary
Human hearing sensitivity to interaural time differences (ITDs) improves with wider bandwidths, not temporal envelope sharpness. Additional auditory channels likely explain this enhanced ITD perception.
Area of Science:
- Auditory Neuroscience
- Psychoacoustics
- Signal Processing
Background:
- Humans perceive interaural time differences (ITDs) from slow modulations on high-frequency carriers.
- Temporal envelope sharpness influences ITD sensitivity, but its upper limit is unknown.
Purpose of the Study:
- To investigate the impact of bandwidth and center frequency on ITD sensitivity.
- To determine if temporal envelope sharpness, rather than bandwidth, limits ITD perception.
Main Methods:
- Varying pulse trains in relative bandwidth (compared to critical bandwidths) and center frequency.
- Analyzing ITD sensitivity across different acoustic parameters.
Main Results:
- ITD sensitivity increased with increasing bandwidth.
- No significant effect of center frequency was observed when relative bandwidths were analyzed.
- Temporal envelope sharpness (absolute bandwidth in Hz) did not directly correlate with performance.
Conclusions:
- Auditory channel recruitment, not temporal envelope sharpness, is the primary factor enhancing ITD sensitivity.
- Wider bandwidths facilitate better ITD perception by engaging more auditory channels.
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