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Temporal masking 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, MA 02139, USA. jdesloge@mit.edu
The Journal of the Acoustical Society of America
|September 1, 2011
Summary
This study shows that simulated hearing loss accurately mimics real sensorineural hearing loss in temporal masking functions. This finding validates a novel method for hearing loss research.
Area of Science:
- Audiology
- Auditory Neuroscience
- Signal Processing in Hearing
Background:
- Understanding sensorineural hearing loss (SNHL) is crucial for developing effective hearing aids and interventions.
- Temporal masking, the ability to detect a sound in the presence of a preceding sound, is altered in individuals with SNHL.
- Previous research has explored various methods to simulate hearing loss in normal-hearing listeners for experimental purposes.
Purpose of the Study:
- To evaluate the efficacy of a functional simulation of hearing loss in replicating temporal masking functions observed in individuals with SNHL.
- To compare the temporal masking characteristics between listeners with real SNHL and normal-hearing listeners with simulated SNHL.
Main Methods:
- Eight listeners with mild to severe SNHL and age-matched normal-hearing listeners participated.
- Hearing loss was simulated in normal-hearing listeners using spectrally-shaped masking noise and multi-band expansion.
- Temporal masking functions were measured using a forward-masking paradigm across four probe frequencies (500-4000 Hz) and three masker-to-probe frequency ratios.
Main Results:
- No significant differences were found in the slopes and y-intercepts of temporal masking functions between listeners with real and simulated hearing loss.
- Y-intercepts positively correlated with the degree of hearing loss, while slopes showed a negative correlation.
- The ratio of slopes for low-frequency vs. on-frequency maskers was similar in both groups, suggesting comparable compressive effects.
Conclusions:
- The functional simulation effectively reproduces temporal masking functions characteristic of sensorineural hearing loss.
- This simulation method provides a reliable tool for investigating the effects of SNHL on auditory processing without requiring participants with hearing loss.
- The findings contribute to a better understanding of the auditory system's temporal dynamics in hearing impairment.
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