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Accounting for nonmonotonic precursor duration effects with gain reduction in the temporal window model
Elin Roverud1, Elizabeth A Strickland1
1Department of Speech, Language, and Hearing Sciences, Purdue University, West Lafayette, Indiana 47907-2038.
The Journal of the Acoustical Society of America
|March 11, 2014
Summary
Forward masking mechanisms were explored using a modified temporal window model (TWM-GR) that includes gain reduction. This model successfully predicted auditory masking effects, unlike the original TWM.
Area of Science:
- Auditory Neuroscience
- Psychoacoustics
- Signal Processing
Background:
- Forward masking mechanisms remain unclear.
- The temporal window model (TWM) suggests neural integration within a temporal window.
- The medial olivocochlear reflex (MOCR) may influence forward masking by reducing cochlear gain.
Purpose of the Study:
- Investigate the role of precursor duration on gain reduction in forward masking.
- Examine differences between on-frequency and off-frequency precursors.
- Modify the TWM to incorporate gain reduction (TWM-GR) and compare its predictive power.
Main Methods:
- Utilized a growth of masking (GOM) paradigm with off-frequency maskers and precursors.
- Estimated basilar membrane input/output (I/O) functions.
- Varied precursor duration for both on-frequency and off-frequency conditions.
- Developed and tested the temporal window model-gain reduction (TWM-GR).
Main Results:
- On-frequency precursors showed threshold rollover with increasing duration.
- Off-frequency precursors showed continuous threshold increase with duration.
- These results suggest frequency-selective gain reduction rather than purely neural masking.
- The TWM-GR model accurately predicted the observed rollover and frequency-specific effects.
Conclusions:
- Forward masking involves frequency-selective gain reduction, potentially mediated by the MOCR.
- The modified TWM-GR provides a better account of psychophysical forward masking data.
- History-dependent gain reduction is a crucial factor in understanding auditory masking.
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