Factors constraining the benefit to speech understanding of combining information from low-frequency hearing and a cochlear implant.
Factors constraining the benefit to speech understanding of combining information from low-frequency hearing and a cochlear implant.
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DOI：
10.1016/j.heares.2014.09.010
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发表时间：
2015-04
期刊：
影响因子：
2.8
通讯作者：
Gifford, Rene
中科院分区：
文献类型：
--
作者：
Dorman, Michael F.;Cook, Sarah;Spahr, Anthony;Zhang, Ting;Loiselle, Louise;Schramm, David;Whittingham, JoAnne;Gifford, Rene
许多研究已经证明，当人工耳蜗植入（CI）患者可以从植入物对面的耳朵获得低频声学信息时，语音理解将受益。在这项研究中，我们评估了三个因素在确定双峰效益的大小方面的作用-（i）仅CI性能的水平，（ii）低频声学听力耳中听力损失的大小和（iii）测试材料的类型。患者植入物对侧耳中的低频PTA（平均125、250和500 Hz）在较大范围（<30 dB HL to >70 dB HL）内变化。患者接受了以下测试：（i）在安静环境中呈现的CNC单词（n=105）（ii）在安静环境中呈现的AzBio句子（n=102），（iii）在+10 dB信噪比（SNR）下噪声中的AzBio句子（n=69），以及（iv）在+5 dB SNR下的AzBio句子（n=64）。当（i）CI分数低于60%正确率，（ii）低频听力损失低于60 dB HL，以及（iii）测试材料是在噪音背景下呈现的句子时，我们发现最大的双峰益处。当满足这些标准时，一些双峰患者的表现相对于CI患者的表现可以获得40-60个百分点。
Many studies have documented the benefits to speech understanding when cochlear implant (CI) patients can access low-frequency acoustic information from the ear opposite the implant. In this study we assessed the role of three factors in determining the magnitude of bimodal benefit -- (i) the level of CI-only performance, (ii) the magnitude of the hearing loss in the ear with low-frequency acoustic hearing and (iii) the type of test material. The patients had low-frequency PTAs (average of 125, 250 and 500 Hz) varying over a large range (<30 dB HL to >70 dB HL) in the ear contralateral to the implant. The patients were tested with (i) CNC words presented in quiet (n=105) (ii) AzBio sentences presented in quiet (n=102), (iii) AzBio sentences in noise at +10 dB signal-to-noise ratio (SNR) (n=69), and (iv) AzBio sentences at +5 dB SNR (n=64). We find maximum bimodal benefit when (i) CI scores are less than 60 percent correct, (ii) hearing loss is less than 60 dB HL in low-frequencies and (iii) the test material is sentences presented against a noise background. When these criteria are met, some bimodal patients can gain 40-60 percentage points in performance relative to performance with a CI.
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