Busby P A, Clark G M
Department of Otolaryngology, University of Melbourne, Parkville, Victoria, Australia.
J Acoust Soc Am. 2000 Jan;107(1):547-58. doi: 10.1121/1.428353.
Numerical estimates of pitch for stimulation of electrodes along the 22-electrode array of the Cochlear Limited cochlear implant were obtained from 18 subjects who became deaf very early in life. Examined were the relationships between subject differences in pitch estimation, subject variables related to auditory deprivation and experience, and speech-perception scores for closed-set monosyllabic words and open-set Bamford-Kowal-Bench (BKB) sentences. Reliability in the estimation procedure was examined by comparing subject performance in pitch estimation with that for loudness estimation for current levels between hearing threshold and comfortable listening level. For 56% of subjects, a tonotopic order of pitch percepts for electrodes on the array was found. A deviant but reliable order of pitch percepts was found for 22% of subjects, and essentially no pitch order was found for the remaining 22% of subjects. Subject differences in pitch estimation were significantly related to the duration of auditory deprivation prior to implantation, with the poorest performance for subjects who had a longer duration of deafness and a later age at implantation. Subjects with no tonotopic order of pitch percepts had the lowest scores for the BKB sentence test, but there were no differences across subjects for monosyllabic words. Performance in pitch estimation for electrodes did not appear to be related to performance in the estimation procedure, as all subjects were successful in loudness estimation for current level.
对18名自幼失聪的受试者，获取了沿科利耳有限公司人工耳蜗22电极阵列刺激电极时的音高数值估计。研究了音高估计中的个体差异、与听觉剥夺和经验相关的个体变量，以及闭集单音节词和开集班福德-科瓦尔-本奇（BKB）句子的言语感知分数之间的关系。通过比较受试者在音高估计中的表现与在听阈和舒适聆听水平之间的电流水平下响度估计的表现，来检验估计程序的可靠性。对于56%的受试者，发现阵列上电极的音高感知存在音调拓扑顺序。对于22%的受试者，发现了一种异常但可靠的音高感知顺序，而其余22%的受试者基本未发现音高顺序。音高估计中的个体差异与植入前听觉剥夺的持续时间显著相关，耳聋持续时间较长且植入年龄较晚的受试者表现最差。音高感知没有音调拓扑顺序的受试者在BKB句子测试中的得分最低，但在单音节词方面受试者之间没有差异。电极音高估计的表现似乎与估计程序的表现无关，因为所有受试者在当前水平的响度估计中都取得了成功。
