Busby Peter A, Au Agnes
a Cochlear Limited , Melbourne , Australia.
b The Hearing CRC , Melbourne , Australia , and.
Int J Audiol. 2017 Nov;56(11):862-869. doi: 10.1080/14992027.2017.1339129. Epub 2017 Jun 22.
This study investigated categorical loudness scaling in a large group of cochlear implant (CI) recipients.
Categorical loudness was measured for individually determined sets of current amplitudes on apical, mid and basal electrodes of the Nucleus array.
Thirty adult subjects implanted with the Nucleus CI.
Subjects were generally reliable in categorical loudness scaling. As expected, current levels eliciting the same loudness categories differed across subjects and electrodes in many cases. After scaling the electric levels to remove differences in dynamic ranges across subjects and electrodes, the across-subject loudness functions for the three electrodes were very similar.
Scaled electric current to remove differences in dynamic range, as implemented in the Nucleus processor, ensures uniform loudness across the array and CI recipients. The results also showed that categorical loudness scaling for electric stimulation was similar to that for acoustic stimulation in normal hearing subjects. These findings could be used as a guide for aligning electric and acoustic loudness in CI recipients with contralateral hearing.
本研究调查了一大群人工耳蜗（CI）植入者的分类响度标度。
对Nucleus阵列的顶端、中部和基部电极上单独确定的电流幅度集测量分类响度。
30名植入Nucleus CI的成年受试者。
受试者在分类响度标度方面总体可靠。正如预期的那样，在许多情况下，引起相同响度类别的电流水平在受试者和电极之间存在差异。在对电水平进行标度以消除受试者和电极之间动态范围的差异后，三个电极的受试者间响度函数非常相似。
如Nucleus处理器中所实现的那样，对电流进行标度以消除动态范围的差异，可确保整个阵列和CI植入者的响度均匀。结果还表明，电刺激的分类响度标度与正常听力受试者的声刺激分类响度标度相似。这些发现可作为指导，用于使有对侧听力的CI植入者的电响度和声响度对齐。
