Dorman M F, Loizou P C, Rainey D
Department of Speech and Hearing Science, Arizona State University, Tempe 85287-0102, USA.
J Acoust Soc Am. 1997 Nov;102(5 Pt 1):2993-6. doi: 10.1121/1.420354.
Normally hearing listeners were presented with vowels, consonants, and sentences for identification through an acoustic simulation of a five-channel cochlear implant with electrodes separated by 4 mm (as in the Ineraid implant). The aim of the experiment was to simulate the effect of depth of electrode insertion on identification accuracy. Insertion depth was simulated by outputting sine waves from each channel of the processor at a frequency determined by the cochlear place of electrodes inserted 22-25 mm into the cochlea. The results indicate that simulated insertion depth had a significant effect on performance. Performance at 22- and 23-mm simulated insertion depths was always poorer than normal, and performance at 25 mm simulated insertion depth was, most generally, the same as normal. It is inferred from these results that, if insertion depth could be unconfounded from other coexisting factors in implant patients, then insertion depth would be found to affect speech identification performance significantly.
正常听力的受试者通过模拟电极间距为4毫米的五通道人工耳蜗（如Ineraid人工耳蜗）来识别元音、辅音和句子。该实验的目的是模拟电极插入深度对识别准确率的影响。通过处理器的每个通道输出正弦波来模拟插入深度，正弦波的频率由插入耳蜗22 - 25毫米处电极的耳蜗位置决定。结果表明，模拟插入深度对表现有显著影响。在22毫米和23毫米模拟插入深度时的表现总是比正常情况差，而在25毫米模拟插入深度时的表现通常与正常情况相同。从这些结果可以推断，如果植入患者的插入深度能够与其他共存因素区分开来，那么就会发现插入深度会显著影响言语识别表现。
