Pfingst B E, Holloway L A, Poopat N, Subramanya A R, Warren M F, Zwolan T A
Kresge Hearing Research Institute, Department of Otolaryngology, University of Michigan Medical Center, Ann Arbor 48109-0506.
Hear Res. 1994 Aug;78(2):197-209. doi: 10.1016/0378-5955(94)90026-4.
Frequency difference limens were determined as a function of reference-stimulus level for pulsatile electrical stimuli in 5 postlingually deaf human subjects with Nucleus-22 cochlear implants and for sinusoidally amplitude-modulated acoustic white noise stimuli in 4 normal-hearing humans. Subjects were tested at levels throughout the dynamic range and extending to the lowest detectable levels. Response stability was measured over the course of 10 sessions. For electrical stimulation in the deaf ears, difference limens decreased as a function of level throughout much or all of the dynamic range of hearing. This result contrasts with the case for nonspectral acoustic stimulation of normal-hearing subjects, where nonspectral frequency difference limens were strongly affected by level only near the detection threshold. These data suggest differences in the acoustic and electrical response spaces that must be considered in the design of auditory prosthesis processors.
针对5名使用Nucleus-22型人工耳蜗的语后聋人类受试者的脉冲电刺激，以及4名听力正常的人类受试者的正弦调幅白噪声刺激，测定了频率差阈作为参考刺激水平的函数。受试者在整个动态范围内进行测试，并延伸至最低可检测水平。在10个测试阶段中测量了反应稳定性。对于聋耳的电刺激，在听力的大部分或全部动态范围内，差阈随刺激水平的升高而降低。这一结果与正常听力受试者的非频谱声刺激情况形成对比，在非频谱声刺激中，非频谱频率差阈仅在接近检测阈值时受刺激水平的强烈影响。这些数据表明，在设计听觉假体处理器时，必须考虑声学和电反应空间的差异。
