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Short-term temporal integration: evidence for the influence of peripheral compression
A J Oxenham1, B C Moore, D A Vickers
1Institute for Perception Research (IPO), Eindhoven, The Netherlands. oxenham@ipo.tue.nl
The Journal of the Acoustical Society of America
|June 1, 1997
Summary
This study on hearing loss found that normally hearing listeners integrate sound differently than those with hearing impairments, especially at shorter durations. Masker level significantly impacts sound integration in normal hearing but not in impaired hearing.
Area of Science:
- Auditory Neuroscience
- Psychoacoustics
- Hearing Science
Background:
- Understanding auditory signal processing is crucial for diagnosing and treating hearing loss.
- Temporal integration, the ability to combine sound energy over time, is fundamental to hearing perception.
- Previous research indicates differences in temporal integration between normal and impaired hearing, but short-duration effects are less understood.
Purpose of the Study:
- To investigate how signal duration and masker level affect auditory temporal integration in normally hearing and hearing-impaired listeners.
- To compare the temporal integration functions across different masker levels and hearing statuses.
- To evaluate a computational model's ability to explain observed psychophysical data.
Main Methods:
- Measured auditory detection thresholds for a sinusoidal signal in broadband noise across varying signal durations (2-400 ms) and masker levels.
- Compared results between normally hearing participants and participants with cochlear hearing loss.
- Utilized a computational model incorporating basilar-membrane compression and a temporal integrator.
Main Results:
- Normally hearing listeners showed a steeper integration function slope at medium masker levels for short durations (2-10 ms), an effect absent at longer durations.
- Hearing-impaired listeners did not exhibit level-dependent changes in their integration function slopes.
- For durations >10 ms, hearing-impaired listeners had shallower slopes than normally hearing listeners, consistent with prior studies.
Conclusions:
- Basilar-membrane compression nonlinearity and a central temporal integrator model can explain the observed level-dependent changes in temporal integration.
- The model suggests greater compression at medium masker levels for normally hearing listeners.
- Findings highlight distinct temporal processing strategies between normal and impaired hearing, particularly under varying masker conditions.