[Tone recognition and electrode discrimination in prelingually deafened cochlear-implant listeners]
Chao-gang Wei1, Ke-li Cao, Xiao-wei Chen
1Cochlear Implant Center, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Beijing 100730, China.
Objective:
To investigate tone recognition and electrode discrimination in prelingually deafened children with the Nucleus device, and to develop guidelines for customized mapping in the implant users.
Methods:
Fourteen prelingually deafened children with cochlear implants participated in this study. Tone recognition was measured with a four-alternative, forced choice procedure from 25 consonant-vowel syllables, each of which had four tonal variations. Electrode discrimination was measured using a same-difference procedure on 7 pairs of electrodes covering the entire electrode array.
Results:
Tone recognition ranged from 35% to 99% correct with a mean of 62.8% and standard deviation of 14.7% in these users. Electrode discrimination had the mean threshold of 3.4 +/- 0.9, with the best performance from the middle electrodes (E 14 and E 17) at 2.6 and the followed performance at the most apical electrode (E 20).
Conclusion:
The results showed significant individual differences from both tone recognition and electrode discrimination, but there is significant correlation between them.
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