Yang Hsin-I, Zeng Fan-Gang
a Department of Biomedical Engineering and Center for Hearing Research , University of California Irvine , Irvine , CA , USA.
Int J Audiol. 2017;56(sup2):S17-S22. doi: 10.1080/14992027.2017.1321789. Epub 2017 May 9.
The present study aimed to measure bimodal benefits and probe their underlying mechanisms in Mandarin-speaking cochlear implant (CI) subjects who had contralateral residual acoustic hearing.
The subjects recognised words or phonemes from the Mandarin Lexical Neighborhood Test in noise at a 10-dB signal-to-noise ratio (SNR) with acoustic stimulation, electric stimulation or the combined bimodal stimulation.
Thirteen Mandarin-speaking subjects wore a CI in one ear and had residual acoustic hearing in the contralateral ear. Six of the subjects (5.2-13.0 years) had pre-lingual onset of severe hearing loss, and seven of them (8.6-45.8 years) had post-lingual onset of severe hearing loss.
Both groups of subjects produced a significant bimodal benefit in word recognition in noise. Consonants and tones accounted for the bimodal benefit. The bimodal integration efficiency was negatively correlated with the duration of deafness in the implanted ear for vowel recognition but positively correlated with CI or bimodal experience for consonant recognition.
The present results support preservation of residual acoustic hearing, early cochlear implantation and continuous use of bimodal hearing for subjects who have significant residual hearing in the non-implanted ear.
本研究旨在测量双侧获益情况，并探究其在有对侧残余听力的普通话使用者人工耳蜗（CI）受试者中的潜在机制。
受试者在10分贝信噪比（SNR）的噪声环境下，通过声学刺激、电刺激或联合双侧刺激，从普通话词汇邻域测试中识别单词或音素。
13名讲普通话的受试者一侧耳朵佩戴人工耳蜗，另一侧耳朵有残余听力。其中6名受试者（5.2 - 13.0岁）为语前重度听力损失发病，7名受试者（8.6 - 45.8岁）为语后重度听力损失发病。
两组受试者在噪声环境下的单词识别中均产生了显著的双侧获益。辅音和声调对双侧获益有贡献。双侧整合效率在元音识别中与植入耳的耳聋持续时间呈负相关，但在辅音识别中与人工耳蜗或双侧听力经验呈正相关。
目前的结果支持为非植入耳有显著残余听力的受试者保留残余听力、早期进行人工耳蜗植入以及持续使用双侧听力。
