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A Method to Study Adaptation to Left-Right Reversed Audition
Published on: October 29, 2018
Temporal modulation transfer functions for listeners with real and simulated hearing loss.
Joseph G Desloge1, Charlotte M Reed, Louis D Braida
1Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
The Journal of the Acoustical Society of America
|June 21, 2011
Summary
Simulating hearing loss accurately reproduced threshold elevations but not temporal modulation transfer functions (TMTFs). This suggests current methods may not fully capture real-world auditory processing challenges in sensorineural hearing loss.
Area of Science:
- Auditory Neuroscience
- Signal Processing in Hearing
- Psychoacoustics
Background:
- Sensorineural hearing loss affects auditory processing, including temporal modulation perception.
- Temporal Modulation Transfer Functions (TMTFs) are crucial for understanding speech intelligibility.
- Accurate simulation of hearing loss is vital for auditory research and device development.
Purpose of the Study:
- To evaluate the efficacy of a functional hearing loss simulation in replicating TMTFs.
- To compare TMTFs between individuals with sensorineural hearing loss and those with simulated hearing loss.
- To identify potential limitations in current hearing loss simulation techniques.
Main Methods:
- TMTFs were measured in nine listeners with sensorineural hearing loss and age-matched normal-hearing listeners with simulated hearing loss.
- Simulations utilized spectrally shaped masking noise or masking noise with multiband expansion.
- TMTFs were assessed using a broadband noise carrier across modulation rates from 2 to 1024 Hz.
Main Results:
- Simulations successfully replicated threshold elevations in hearing-impaired listeners.
- Simulations did not accurately reproduce the TMTFs of hearing-impaired listeners.
- Simulated hearing loss showed lower modulation sensitivity and higher cutoff frequencies compared to real hearing loss.
Conclusions:
- Current functional hearing loss simulations effectively model threshold changes but not TMTF characteristics.
- Discrepancies suggest limitations in simulating complex auditory phenomena like recruitment.
- Further refinement of hearing loss simulation models is needed for accurate psychoacoustic research.
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