Tye-Murray N, Lowder M, Tyler R S
Department of Otolaryngology-Head and Neck Surgery, University of Iowa Hospitals and Clinics, Iowa City.
Ear Hear. 1990 Jun;11(3):195-200. doi: 10.1097/00003446-199006000-00005.
In April 1985, an updated processing strategy became available for the Cochlear Corporation Nucleus cochlear implant. Whereas the original strategy codes only fundamental frequency, amplitude, and information in the second formant region, the newer strategy also codes frequencies in the first formant region. This investigation evaluated the speech recognition skills of five subjects who were experienced with both designs. On average, the addition of first formant information improved word identification in an audition-only condition and improved spondee recognition in noise. Scores for the NU 6 Monosyllabic Word Test and the Sentence Test Without Context improved from 8% (2-12%) to 28% words correct (10-42%), and from 31% (10-45%) to 64% words correct (39-84%), respectively. Scores for the Four-Choice Spondee Test in noise improved from 37% (25-50%) to 75% (45-90%). The percent correct scores for the Iowa 14-Item Consonant Confusion Test in an audition-only and vision-plus-audition condition did not vary with the change in processing strategy. However, an information transfer analysis performed on the responses to the consonant test in a vision-only and a vision-plus-audition condition suggested that the newer strategy enhances the transmission of the voicing, duration, and envelope features.
1985年4月，科利耳公司的核型人工耳蜗有了一种更新的处理策略。原始策略仅对基频、振幅以及第二共振峰区域的信息进行编码，而新策略还对第一共振峰区域的频率进行编码。本研究评估了五名对两种设计都有使用经验的受试者的言语识别技能。平均而言，增加第一共振峰信息提高了仅听觉条件下的单词识别能力，并改善了噪声环境下的扬扬格识别能力。NU 6单音节词测试和无上下文句子测试的得分分别从8%（2%-12%）正确单词提高到28%（10%-42%），以及从31%（10%-45%）正确单词提高到64%（39%-84%）。噪声环境下四选一扬扬格测试的得分从37%（25%-50%）提高到75%（45%-90%）。在仅听觉和视觉加听觉条件下，爱荷华14项辅音混淆测试的正确得分百分比并未随处理策略的改变而变化。然而，在仅视觉和视觉加听觉条件下对辅音测试的反应进行的信息传递分析表明，新策略增强了浊音、时长和包络特征的传递。
