ELECTRODE RANKING OF PLACE PITCH AND SPEECH RECOGNITION IN ELECTRICAL HEARING
ELECTRODE RANKING OF PLACE PITCH AND SPEECH RECOGNITION IN ELECTRICAL HEARING
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DOI：
10.1121/1.413317
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发表时间：
1995-10-01
影响因子：
2.4
通讯作者：
LEVINE, S
中科院分区：
文献类型：
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作者：
NELSON, DA;VANTASELL, DJ;LEVINE, S
在Nucleus人工耳蜗植入体的14名个体用户中，使用电极排序程序评价了基于“音高或锐度”区分不同电极电刺激的能力。在电极排序测试之前，测量绝对阈值和最大舒适响度水平，并且在所有可用电极上实现响度平衡。根据比较电极之间的每mm距离的d'来定义电极排序任务的性能。在人工耳蜗使用者中发现了很大的个体差异。在具有良好到优秀的位置音高敏感性的受试者中，电极排序任务受到天花板效应的限制;然而，在具有差到中等敏感性的受试者中，d '/mm相对恒定，电极之间具有空间间隔。放置间距通常从顶端到基底电极排序，即，基底电极被判断为比更顶端的电极在节距上更高。然而，在某些受试者的某些电极上可以看到位置音高顺序的逆转。还观察到电极阵列顶侧半部分的电极等级优于基底侧半部分，反之亦然。根据每个刺激的d'对电极分级函数的分析表明，在一些受试者中，在比较电极之间的最小可能值为0.75 mm时达到了完美的性能。在其他受试者中，直到比较电极之间的空间间隔超过13 mm，超过电极阵列整个长度的四分之三，才达到完美的性能。其中十名受试者还参加了一个封闭的集合识别任务的元音间的辅音。虽然最大的传输信息的辅音清晰度（这主要是基于频谱语音线索）的地方只有34%，地方音高灵敏度和传输的语音信息之间的相关性高达0.71。考虑到一些受试者表现出的出色的位置-音高敏感性，这是令人惊讶的，并且可能反映了Nucleus语音编码策略用于表示频谱编码语音信息的局限性。两个语前受试者的表现显着较差的语音任务比语后受试者，即使一个语前受试者表现出非常好的位置音高敏感性。(C)1995年美国声学学会。
The ability to distinguish electrical stimulation of different electrodes on the basis of ''pitch or sharpness'' was evaluated with an electrode ranking procedure in 14 individual users of the Nucleus cochlear implant. Prior to the electrode ranking test, absolute thresholds and maximum comfortable loudness levels were measured, and loudness balancing was accomplished across all usable electrodes. Performance on the electrode ranking task was defined in terms of d' per mm of distance between comparison electrodes. Large individual differences were found among cochlear-implant users. In subjects with good to excellent place-pitch sensitivity, the electrode ranking task was limited by a ceiling effect; however, in those with poor to moderate sensitivity d'/mm was relatively constant with spatial separation between electrodes. Place pitch was typically ordered from apical to basal electrodes, i.e., basal electrodes were judged to be higher in pitch than more apical electrodes. However, instances of reversals in place-pitch ordering were seen on some electrodes in some subjects. Instances were also seen of better electrode ranking in the apical half of the electrode array than in the basal half, and vice-versa. Analyses of the electrode ranking functions in terms of d' per stimulus indicated that, in some subjects, perfect performance was reached with as little as 0.75 mm between comparison electrodes, the minimum possible. In other subjects, perfect performance was not reached until the spatial separation between comparison electrodes was over 13 mm, more than three quarters of the entire length of the electrode array. Ten of the subjects also participated in a closed-set recognition task of intervocalic consonants. Although the maximum transmitted information for place of consonant articulation (which is based primarily on spectral speech cues) was only 34%, correlations between place-pitch sensitivity and transmitted speech information were as high as 0.71. This was surprising considering the excellent place-pitch sensitivity exhibited by some of the subjects, and may reflect limitations of the Nucleus speech coding strategy for representing spectrally coded speech information. The two prelingual subjects performed notably poorer on the speech task than the postlingual subjects, even though one of the prelingual subjects demonstrated very good place-pitch sensitivity. (C) 1995 Acoustical Society of America.