Hoth Sebastian
Univ.-HNO-Klinik Heidelberg, Im Neuenheimer Feld 400, 69120, Heidelberg, Germany.
Eur Arch Otorhinolaryngol. 2007 Feb;264(2):129-38. doi: 10.1007/s00405-006-0159-y. Epub 2006 Sep 27.
Categorical loudness scaling of electric and acoustic stimuli was performed in cochlear implant (CI) recipients equipped with Nucleus systems in order to achieve a normal loudness perception in the whole dynamic range of acoustic input. For each electrode, the lower and upper limits of electric stimulus were defined by the values corresponding to "very soft" and "too loud". Within this dynamic range, the stimulus strength intervals associated to the verbal categories "soft", "medium", "loud" and "very loud" were determined. The same loudness categories were used for the scaling of acoustic stimuli. From both scaling experiments, the transduction of the CI system can be assessed and the parameters of the individual mapping function yielding a normal loudness growth can be derived. Deviations from optimum mapping can be corrected at least partially by manipulating the parameters of the mapping function. In many cases, however, one mapping function is not sufficient for all channels. The results argue in favour of the development of flexible and channel-specific mapping function parameters in future CI systems.
为了在整个声学输入动态范围内实现正常的响度感知，对配备Nucleus系统的人工耳蜗（CI）植入者进行了电刺激和声刺激的分类响度标度。对于每个电极，电刺激的下限和上限由对应于“非常轻柔”和“太响”的值定义。在这个动态范围内，确定与语言类别“轻柔”“适中”“响亮”和“非常响亮”相关的刺激强度区间。相同的响度类别用于声刺激的标度。通过这两个标度实验，可以评估CI系统的转换，并得出产生正常响度增长的个体映射函数的参数。通过操纵映射函数的参数，至少可以部分纠正与最佳映射的偏差。然而，在许多情况下，一个映射函数对所有通道并不足够。这些结果支持在未来的CI系统中开发灵活且特定于通道的映射函数参数。
