Abstract
Though the benefits of combined electric-and-acoustic stimulation (EAS) have been widely reported, its underlying mechanisms responsible are not well understood yet. This study assessed the effect of balanced spectral amplitudes between acoustic and electric portions in EAS to vowel identification via two experiments. Four vowels (i.e., /iy/, /eh/, /oo/ and /ah/) were synthesized using pure-tone harmonic components. In Experiment 1, the spectral amplitudes of natural vowels were elevated for either acoustic (below 600 Hz) or electric portions (above 600 Hz) from 5 dB to 30 dB. Vowel identification scores were collected from eight normal-hearing listeners. In Experiment 2, the synthesized vowel stimuli were processed by the signal processing condition simulating the electric-and-acoustic stimulation. The results of identifying synthesized vowels and synthesized EAS-processed vowels in the two experiments showed the similar patterns of declined identification rates as a function of (acoustic or electric) sp...
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