Information from the voice fundamental frequency (F0) region accounts for the majority of the benefit when acoustic stimulation is added to electric stimulation.
Information from the voice fundamental frequency (F0) region accounts for the majority of the benefit when acoustic stimulation is added to electric stimulation.
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DOI：
10.1097/aud.0b013e3181b7190c
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发表时间：
2010-02
期刊：
影响因子：
3.7
通讯作者：
Spahr AJ
中科院分区：
文献类型：
--
作者：
Zhang T;Dorman MF;Spahr AJ
本研究的目的是确定让一只耳朵植入人工耳蜗、另一只耳朵获得低频听力的听者获得言语感知益处所需的最低低频声学信息量。在三种听力条件下评估安静中单音节单词和噪声中句子的识别：单独的电刺激、单独的声刺激以及电和声刺激的组合。呈现给非植入耳朵的声刺激要么以 125、250、500 或 750 Hz 进行低通滤波，要么未经滤波（宽带）。将低频声学信息添加到电刺激信息中，可以显着改善安静环境下的单词识别和噪声环境下的句子识别。即使声学信息仅限于 125 Hz 低通信号，电刺激和声学刺激条件也有所改善。当声音信号增加到宽带时，可以观察到噪声中的句子的进一步改善。当声刺激添加到电刺激中时，来自语音基频 (F0) 区域的信息占语音感知益处的大部分。我们认为，在安静的情况下，低频声学信息可以改善发声的表示，进而导致词典中候选词的减少。在噪声中，稳健的发声表示允许访问标记音节结构和单词边界的低频声学地标。这些地标可以引导单词和句子识别。
The aim of this study was to determine the minimum amount of low-frequency acoustic information that is required to achieve speech perception benefit in listeners with a cochlear implant in one ear and low-frequency hearing in the other ear. The recognition of monosyllabic words in quiet and sentences in noise was evaluated in three listening conditions: electric stimulation alone, acoustic stimulation alone, and combined electric and acoustic stimulation. The acoustic stimuli presented to the nonimplanted ear were either low-pass-filtered at 125, 250, 500, or 750 Hz, or unfiltered (wideband). Adding low-frequency acoustic information to electrically stimulated information led to a significant improvement in word recognition in quiet and sentence recognition in noise. Improvement was observed in the electric and acoustic stimulation condition even when the acoustic information was limited to the 125-Hz-low-passed signal. Further improvement for the sentences in noise was observed when the acoustic signal was increased to wideband. Information from the voice fundamental frequency (F0) region accounts for the majority of the speech perception benefit when acoustic stimulation is added to electric stimulation. We propose that, in quiet, low-frequency acoustic information leads to an improved representation of voicing, which in turn leads to a reduction in word candidates in the lexicon. In noise, the robust representation of voicing allows access to low-frequency acoustic landmarks that mark syllable structure and word boundaries. These landmarks can bootstrap word and sentence recognition.
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