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Study evaluated the effect of speaking rate on speech perception with unprocessed and envelope enhancement in competing noise on normal hearing younger adults (YAG) and older adults (OAG). Method: A purposive sampling with repeated measures research design was adopted to evaluate envelope enhancement on speech perception in adverse listening condition . Study samples: Thirty normal hearing participants were grouped into two based on age: YAG (N=15) within age range of 18 to 25 years and OAG (N=15) within age range of 65 to 83 years. Three lists of unprocessed phrases and three lists of deep band modulated version of phrases were utilized. These phrases were presented at each of 3 speech rates (normal, 35 %, and 40 %), and each of three different signal-to-noise ratio (quiet, -1 dB SNR and -5 dB SNR) at participant’s comfortable level. Results: In each rate of speech at each SNR the perception scores was significantly better in DBM than UP. As expected, in each condition YAG performed significantly better than OAG on speech perception. Further, perception score of UP from YAG was almost equal to scores of DBM from OAG, in each experimental condition. To conclude older adults can take advantage of envelope enhancement by lessening their temporal processing impairment when speech rate is altered and embedded in noise.
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