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  • Title: Consonant recognition by some of the better cochlear-implant patients.
    Author: Tyler RS, Moore BC.
    Journal: J Acoust Soc Am; 1992 Dec; 92(6):3068-77. PubMed ID: 1474222.
    Abstract:
    Fifty-four of the better cochlear-implant patients from Europe and the United States were tested on two consonant recognition tests using nonsense syllables. One was produced in an accent appropriate for their own language by a male and a female talker. Recorded tokens of /ibi, idi, igi, ipi, iti, iki, ifi, ivi, ifi, isi, izi, imi, ini/ were presented. With the French syllables, six patients with the Chorimac device averaged 18% correct (6%-29%). With the German syllables, nine patients with the 3M/Vienna device averaged 34% correct (17%-44%), ten patients with the Nucleus device (tested in Hannover) averaged 31% correct (19%-42%), and ten patients with the Duren/Cologne device averaged 27% correct (10%-56%). With the English syllables, ten patients with the Nucleus device (tested in the United States) averaged 42% correct (29%-62%), and nine patients with the Symbion device averaged 46% correct (31%-69%). An information-transmission analysis and sequential information-transfer analysis of the confusions suggested that different implants provided differing amounts of feature information. The place of articulation feature was typically the most difficult to code for all implants. In the second test a male and a female talker recorded the stimuli /ibi, idi, igi, imi, ini, ifi, isi, izi/ in a single manner that was appropriate for all three languages. Six patients with the Chorimac device averaged 27% (13%-48%), ten patients with the Duren/Cologne implant averaged 29% (15%-75%), ten patients with the Nucleus device (tested in Hannover) averaged 40% (25%-58%), ten patients with the Nucleus device (tested in the United States) averaged 49% (40%-60%), nine patients with the Symbion device averaged 61% (40%-75%), and nine patients with the 3M/Vienna device averaged 41% (29%-52%) correct.
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