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首页> 外文期刊>Audiology & neuro-otology >Minimum audible angle, just noticeable interaural differences and speech intelligibility with bilateral cochlear implants using clinical speech processors.
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Minimum audible angle, just noticeable interaural differences and speech intelligibility with bilateral cochlear implants using clinical speech processors.

机译：使用临床语音处理器，双侧人工耳蜗的最小可听角度，仅明显的耳间差异和语音清晰度。

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Sound localization and speech intelligibility were assessed in 5 patients implanted bilaterally with Medel C40+ or Medel C40 cochlear implant (CI) systems. The minimum audible angle (MAA) around the head in the horizontal plane was assessed in patients with bilateral CI using white noise bursts of 1000 ms duration presented from a loudspeaker mounted on a rotating boom and compared with the MAA of age-matched normal hearing controls. Spatial discrimination was found to be good in front and in the back of the head with near-normal MAA values (patients: 3-8 degrees , controls: 1-4 degrees ). In contrast, poor performance on the sides was found (patients: 30 to over 45 degrees , controls 7-10 degrees ). Bilateral CI significantly improved spatial discrimination in front for all patients, when compared with the use of either CI alone. Just noticeable differences (JNDs) in interaural intensity and time were assessed using white noise bursts (1000 ms duration; 50 ms linear ramp). In addition, interaural timeJNDs were assessed using click trains (800 ms duration, 40 mus clicks, 50 Hz) and noise bursts in which either only the envelope or only the fine structure was shifted in time. In comparison with normal hearing controls, patients with bilateral CI showed near-normal interaural intensity JNDs but substantially poorer interaural time JNDs depending on the type of stimulus. In contrast to envelope onset/offset cues, interaural fine structure time differences were not perceived by the patients using CI systems employing the continuous interleaved sampling strategy without synchronization between their pulse stimulation times. Speech intelligibility in quiet and CCITT noise from the side (+/-90 degrees ) was assessed using the German HSM sentence test and was significantly better when using bilateral CI in comparison with either unilateral CI, mainly due to a head shadow effect. These favorable results are in agreement with the patients' subjective experiences assessed with a questionnaire and support the use of bilateral CI.
机译：评估了5例双侧植入Medel C40 +或Medel C40人工耳蜗（CI）系统的患者的声音定位和语音清晰度。在双侧CI患者中，使用安装在旋转吊杆上的扬声器提供的1000 ms持续时间的白噪声突发，评估了双侧CI患者头部周围的最小可闻角度（MAA），并将其与年龄匹配的正常听力对照的MAA进行了比较。发现空间分辨力在头部前后均良好，MAA值接近正常（患者：3-8度，对照：1-4度）。相反，发现两侧表现不佳（患者：30至45度以上，对照7-10度）。与单独使用任一CI相比，双侧CI均可显着改善所有患者的前方空间辨别力。使用白噪声脉冲（持续时间1000 ms;线性斜坡50 ms）评估了耳间强度和时间的明显差异（JND）。此外，使用喀嗒声训练（800毫秒持续时间，40 mus咔嗒声，50 Hz）和噪声脉冲来评估耳间timeJND，其中仅包络或仅精细结构会随时间移动。与正常的听觉对照相比，双侧CI患者的听觉强度JNDs接近正常，但根据刺激类型的不同，听觉时间JND明显较差。与包膜开始/偏移信号相反，使用连续交错采样策略的CI系统在患者的脉冲刺激时间之间没有同步的情况下，患者没有察觉到耳间精细结构的时间差异。使用德国HSM句子测试评估了从侧面（+/- 90度）的安静度和CCITT噪声中的语音清晰度，并且使用双侧CI优于单侧CI时明显更好，主要是由于头部阴影效应。这些良好的结果与通过问卷调查评估的患者的主观经验一致，并支持双侧CI的使用。

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