Jones P A, McDermott H J, Seligman P M, Millar J B
Human Communication Research Centre, University of Melbourne, Australia.
Ann Otol Rhinol Laryngol Suppl. 1995 Sep;166:363-5.
Two studies are reported in which the effectiveness of explicitly coding voicing and fundamental frequency information for the Nucleus cochlear implant was investigated. In the first study, the voicing perception of a group of three experienced Multipeak users was evaluated when they were using Multipeak and a modified Multipeak in which the explicit fundamental frequency and voicing cues were eliminated and replaced with a 250-Hz constant rate of stimulation. The results of consonant and monosyllabic word tests showed that there was no significant difference in the subjects' ability to discriminate voicing. In the second study, the ability of a group of five experienced users of the constant rate spectral maxima sound processor (SMSP) strategy to discriminate suprasegmental contrasts was evaluated when they were using the SMSP strategy and a modified SMSP strategy that included a rate-encoded representation of the fundamental frequency on the most apical stimulation channel. The results of intonation, roving stress, and question-statement tests showed that there was no significant difference between the scores recorded with these strategies. Since the temporal voicing cue is not a primary cue to voicing discrimination for Multipeak users, and the provision of an additional rate cue to the SMSP strategy does not improve SMSP users' ability to discriminate suprasegmental contrasts, the results of these studies indicate that in the cases investigated, the coding of voice source information by rate of stimulation does not significantly augment the cues present in the spatially distributed constant rate stimulation pattern.
本文报告了两项研究，这两项研究探讨了为 Nucleus 人工耳蜗明确编码浊音和基频信息的有效性。在第一项研究中，评估了一组三名有经验的多峰使用者在使用多峰处理器和一种改良的多峰处理器时的浊音感知能力，改良后的多峰处理器消除了明确的基频和浊音线索，并用 250 赫兹的恒定刺激率取而代之。辅音和单音节词测试结果表明，受试者辨别浊音的能力没有显著差异。在第二项研究中，评估了一组五名有经验的恒定速率谱峰最大值声音处理器（SMSP）策略使用者在使用 SMSP 策略和一种改良的 SMSP 策略时辨别超音段对比的能力，改良后的 SMSP 策略在最顶端的刺激通道上包括了基频的速率编码表示。语调、游动重音和疑问句-陈述句测试结果表明，使用这些策略记录的分数之间没有显著差异。由于时间浊音线索不是多峰使用者辨别浊音的主要线索，并且为 SMSP 策略提供额外的速率线索并不能提高 SMSP 使用者辨别超音段对比的能力，这些研究结果表明，在所研究的案例中，通过刺激率对声源信息进行编码并不能显著增强空间分布恒定速率刺激模式中存在的线索。
