Individual preferences for noise reduction in hearing aids: the perceptual effects of speech distortion and residual noise

One of the main reasons for hearing aid dissatisfaction is the inability to
hear well in noisy environments. For that reason, most hearing aids currently
marketed have a noise reduction algorithm that should make listening in noisy
environments less effortful and more comfortable. It is known that stronger
noise reduction is accompanied with a degradation of speech quality and
therefore it is important to find a balance between the two. Available
research on the perceptual effects of noise reduction concentrates on group
results, not taking fully into account the possible influences of hearing loss
and of differences between individuals. The aim of this research is to improve
rehabilitation by optimizing noise reduction for an individual hearing aid
user. To achieve this we will focus on individual preferences for the trade-off
of two major aspects of noise reduction, namely the amount of residual noise
and the speech distortion caused by the noise reduction algorithm.

This study is designed to clarify how hearing ability and other individual
differences influence the preference for a specific noise reduction strength.
We will concentrate on the trade-off between residual noise and speech
distortion * which is inherent in noise reduction * to systematically study
listeners* preference.

This study is observational in which several listening test will be performed.
The entire visit will last approximately 2.5 hours. The listening tests consist
out of an ANL test, an SRT test and a speech intelligibility rating. Also,
listener preference for the strength of noise reduction will be determined with
a paired comparison experiment.

Since this study is observational, the burden for the patients is minimal.
Several tests similar or equal to those done in standard clinical practice will
be done during the visit. This study forms an important step towards the goal
of being able to tailor the noise reduction to the personal requirements and
preferences of an individual user. Furthermore, it provides an essential base
for further research into the effects of noise reduction in hearing aids.