Hearing Loss Clinical Trial
Official title:
Clinical Applications for Time-Compressed Speech Tests
The purpose of this study is to determine the effects of age-related cognitive changes on
hearing aid benefit based on hearing aid compression time constants.
The hypothesis is that people with poor working memory skills will benefit from slow time
constants in hearing aid compression while those with good working memory skills will be
able to benefit from more sophisticated compression algorithms with rapid time constants.
Recent research has shown the relevance of cognitive function in hearing aid evaluation and
the sensitivity of the aging auditory system to temporal distortions. The proposed
investigation will examine the interaction of working memory and hearing aid compression
method on speech recognition in background competition for older listeners. This interaction
will be investigated for the following three forms of background competition:
1. Competition from continuous speech-shaped noise.
2. Competition from speech-modulated noise.
3. Competition from a single interfering talker.
The goals of the study will be accomplished in two phases. In the first phase, 160 adults
aged 50 through 75 years will be evaluated on a battery of tests to determine their
cognitive capacity, time-compressed speech scores and their candidacy for inclusion in the
second phase of the study. At the conclusion of this phase of testing, the participants will
be divided into three groups:
1. subjects with TCS test scores in the highest quartile (the HIGH group)
2. subjects with TCS test scores in the lowest quartile (the LOW group)
3. the remaining listeners
The second phase of the experiment will include listeners from the HIGH and LOW groups only.
These subjects will be evaluated with respect to their speech recognition ability for three
types of interference (steady-state noise, speech-modulated noise, single interfering
talker). The HINT test (Nilsson, Soli, & Sumida, 1995; Nilsson et al., 1994) will be used to
obtain the signal-to-noise ratio (SNR) at 50% recognition for the three masking conditions
for each of three types of amplification:
1. one- channel linear amplification (LINEAR) with frequency shaping
2. two-channel wide dynamic range compression with fast time constants (FAST)
3. two-channel wide dynamic range compression with slow time constants (SLOW) Listener
groups will be compared across hearing aid conditions and across background
interference conditions.
;
Allocation: Non-Randomized, Endpoint Classification: Efficacy Study, Intervention Model: Parallel Assignment, Masking: Open Label, Primary Purpose: Treatment
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