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Working memory capacity may influence perceived effort during aided speech recognition in noise
Mary Rudner1, Thomas Lunner, Thomas Behrens
1Swedish Institute for Disability Research, Linköping University, Sweden.
Journal of the American Academy of Audiology
|September 13, 2012
Summary
Subjective effort ratings during speech recognition in noise strongly correlate with signal-to-noise ratio (SNR), independent of cognitive capacity. Individual working memory (WM) capacity influences how noise type affects perceived effort in hearing aid users.
Area of Science:
- Audiology
- Cognitive Science
- Speech Processing
Background:
- Subjective effort ratings are increasingly used to measure perceived effort during speech recognition in noise.
- Perceived effort may serve as an indicator of cognitive load.
- Effort ratings in speech recognition tasks may correlate with both signal-to-noise ratio (SNR) and individual cognitive capacity.
Purpose of the Study:
- To investigate the relationship between subjective effort ratings, speech recognition performance, and working memory (WM) capacity in individuals with hearing impairments using hearing aids.
- To determine how SNR and noise type affect perceived effort in hearing-impaired listeners.
- To explore the influence of hearing aid settings on perceived effort.
Main Methods:
- Two experiments were conducted with participants having bilateral mild to moderate sloping hearing loss.
- Participants rated perceived effort using a visual analog scale (VAS) during aided speech perception in noise.
- Speech recognition performance, working memory capacity, and hearing aid compression settings were measured.
Main Results:
- A significant correlation was found between rated effort and SNR, irrespective of individual WM capacity.
- The relationship between rated effort and noise type was influenced by individual WM capacity.
- Hearing aid compression settings affected rated effort in Experiment 2.
Conclusions:
- Subjective effort ratings during speech recognition in noise accurately reflect SNR.
- Individual cognitive capacity plays a role in the perception and rating of different noise types.
- Effort perception in noisy environments is influenced by both acoustic factors and cognitive abilities.
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