Parkinson A J, el-Kholy W, Tyler R S
Department of Otolaryngology-Head and Neck Surgery, University of Iowa, Iowa City, USA.
J Am Acad Audiol. 1998 Jun;9(3):179-90.
Vowel perception ability for 16 prelingually deafened children using Nucleus 22-channel cochlear implants was studied at 12, 24, and 36 months postimplantation. Information transmission analysis was used to evaluate the effectiveness of the implants in conveying the essential cues required for accurate vowel identification and whether the cues used varied with experience or device use. Individual vowel identification varied widely with mean scores significantly improving between 12 and 24 months but not between 24 and 36 months. Information transmission scores for all vowel features (fronting, height, duration, and diphthongization) increased dramatically between 12 and 36 months. Results indicated that vowel height and vowel fronting were the most salient features for the subject group. There were no differences in the pattern of confusions made across test sessions or across groups when divided into "poor" and "good" users. However, there was evidence that the "good" users made better use of higher frequency formant information than the "poor" users. The results of the present study add to the accumulation of evidence pointing to the great benefit that cochlear implantation can provide to prelingually deafened children. Overall performance for the vowel recognition test used in this study was quite high and analysis of the childrens' errors suggested that their cochlear implants were reasonably effective at conveying the most essential spectral information required for vowel discrimination.
对16名使用Nucleus 22通道人工耳蜗的语前聋儿童在植入后12个月、24个月和36个月时的元音感知能力进行了研究。采用信息传输分析来评估人工耳蜗在传递准确识别元音所需的基本线索方面的有效性，以及所使用的线索是否随经验或设备使用情况而变化。个体的元音识别差异很大，平均得分在12个月至24个月之间显著提高，但在24个月至36个月之间没有提高。所有元音特征（舌位前移、高度、时长和双元音化）的信息传输得分在12个月至36个月之间大幅增加。结果表明，元音高度和舌位前移是该受试组最显著的特征。当分为“差”用户和“好”用户时，在不同测试阶段或不同组之间的混淆模式没有差异。然而，有证据表明，“好”用户比“差”用户能更好地利用高频共振峰信息。本研究结果进一步证明了人工耳蜗植入能为语前聋儿童带来巨大益处。本研究中使用的元音识别测试的总体表现相当高，对儿童错误的分析表明，他们的人工耳蜗在传递元音辨别所需的最重要频谱信息方面相当有效。
