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Effects of Masker Envelope Fluctuations on the Temporal Effect
Skyler G Jennings1,2, Kayla Sivas3, Caitlin Stone3
1Department of Communication Sciences and Disorders, The University of Utah, 390 South, 1530 East, BEHS 1201, Salt Lake City, UT, 84112, USA. skyler.jennings@hsc.utah.edu.
Journal of the Association for Research in Otolaryngology : JARO
|August 22, 2018
Summary
Temporal effects in auditory masking improve when masker onsets are delayed. Masker envelope fluctuations, not just frequency, significantly impact this temporal effect, especially for narrowband maskers.
Area of Science:
- Auditory perception
- Psychoacoustics
- Signal processing in hearing
Background:
- Detection thresholds in simultaneous masking can improve with delayed masker onset (temporal effect).
- This effect is prominent with broadband maskers but reduced for narrowband maskers.
- Previous research suggests temporal envelope fluctuations of maskers play a role.
Purpose of the Study:
- To investigate if temporal envelope fluctuations in narrowband maskers explain the reduced temporal effect.
- To test the hypothesis that inherent noise fluctuations diminish the temporal effect.
Main Methods:
- Measured temporal effects using narrowband noise maskers with fluctuating and flattened temporal envelopes.
- Varied masker level and included fluctuating/flattened precursors.
- Analyzed AC-coupled power of temporal envelopes and its relation to probe detection thresholds.
Main Results:
- Temporal effect was absent for fluctuating narrowband maskers.
- A significant temporal effect (up to 7 dB) was observed for flattened narrowband maskers.
- Masker and precursor temporal envelope power explained 94% of the variance in detection thresholds.
Conclusions:
- Temporal envelope fluctuations of narrowband maskers significantly contribute to the presence or absence of the temporal effect.
- These fluctuations should be incorporated into future models of auditory temporal processing.
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