The Hearing CRC, 550 Swanston Street, Carlton, 3053 Victoria, Australia.
J Acoust Soc Am. 2012 Jul;132(1):392-402. doi: 10.1121/1.4718452.
The abilities to hear changes in pitch for sung vowels and understand speech using an experimental sound coding strategy (eTone) that enhanced coding of temporal fundamental frequency (F0) information were tested in six cochlear implant users, and compared with performance using their clinical (ACE) strategy. In addition, rate- and modulation rate-pitch difference limens (DLs) were measured using synthetic stimuli with F0s below 300 Hz to determine psychophysical abilities of each subject and to provide experience in attending to rate cues for the judgment of pitch. Sung-vowel pitch ranking tests for stimuli separated by three semitones presented across an F0 range of one octave (139-277 Hz) showed a significant benefit for the experimental strategy compared to ACE. Average d-prime (d') values for eTone (d' = 1.05) were approximately three time larger than for ACE (d' = 0.35). Similar scores for both strategies in the speech recognition tests showed that coding of segmental speech information by the experimental strategy was not degraded. Average F0 DLs were consistent with results from previous studies and for all subjects were less than or equal to approximately three semitones for F0s of 125 and 200 Hz.
对六位人工耳蜗使用者进行了测试，以评估他们在使用增强了时域基频（F0）信息编码的实验性声音编码策略（eTone）来感知音高变化和理解言语的能力，并与使用其临床策略（ACE）的表现进行了比较。此外，还使用 F0 低于 300 Hz 的合成刺激来测量了率和调制率-音高差限（DL），以确定每位受试者的心理物理能力，并为关注率线索判断音高提供经验。在 F0 范围为一个八度（139-277 Hz）的情况下，对相隔三个半音的刺激进行了 sung-vowel 音高排序测试，与 ACE 相比，实验策略有显著优势。与 ACE（d'=0.35）相比，eTone 的平均 d-prime（d'）值（d'=1.05）大约大三倍。言语识别测试中两种策略的相似得分表明，实验策略对分段言语信息的编码没有受到影响。平均 F0 DL 与先前研究的结果一致，对于所有受试者，对于 125 和 200 Hz 的 F0，其值均小于或等于约三个半音。
