Correlations Between Pitch and Phoneme Perception in Cochlear Implant Users and Their Normal Hearing Peers
Correlations Between Pitch and Phoneme Perception in Cochlear Implant Users and Their Normal Hearing Peers
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DOI：
10.1007/s10162-015-0541-9
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发表时间：
2015-12-01
影响因子：
2.4
通讯作者：
Goldsworthy, Raymond L.
中科院分区：
文献类型：
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作者：
Goldsworthy, Raymond L.
本研究考察了9名人工耳蜗使用者和9名正常听力听者的音素感知和音高感知之间的相关性。对频率为500hz、1000hz和2000hz的纯音频率判别阈值进行了测量。复音基频（F0）判别阈值分别为110、220和440 Hz。振幅和频率波动的影响是在对这种扰动具有鲁棒性的个体在音素感知测量中表现更好的基本原理下测量的。使用辅音和元音材料分别在安静、静止语音形状噪声、频谱陷波声和临时门控声中进行音素识别。人工耳蜗纯音频率判别阈值在1.5 ~ 9.9%之间，而人工耳蜗复音F0判别阈值在2.6 ~ 28.5%之间。人工耳蜗使用者对辅音的平均掩蔽释放量为5.3 dB，对元音的平均掩蔽释放量为8.4 dB。复音辨别与音素识别的相关性一般高于纯音辨别。与音素识别措施的相关性也普遍较高的音调感知措施，包括振幅和频率漫游。复音F0辨别与音素识别的相关性最强。本研究的结果表明，音乐训练或信号处理策略，提高F0辨别应提高在波动噪声辅音识别。
This study examined correlations between pitch and phoneme perception for nine cochlear implant users and nine normal hearing listeners. Pure tone frequency discrimination thresholds were measured for frequencies of 500, 1000, and 2000 Hz. Complex tone fundamental frequency (F0) discrimination thresholds were measured for F0s of 110, 220, and 440 Hz. The effects of amplitude and frequency roving were measured under the rationale that individuals who are robust to such perturbations would perform better on phoneme perception measures. Phoneme identification was measured using consonant and vowel materials in quiet, in stationary speech-shaped noise (SSN), in spectrally notched SSN, and in temporally gated SSN. Cochlear implant pure tone frequency discrimination thresholds ranged between 1.5 and 9.9 %, while cochlear implant complex tone F0 discrimination thresholds ranged between 2.6 and 28.5 %. On average, cochlear implant users had 5.3 dB of masking release for consonants and 8.4 dB of masking release for vowels when measured in temporally gated SSN compared to stationary SSN. Correlations with phoneme identification measures were generally higher for complex tone discrimination measures than for pure tone discrimination measures. Correlations with phoneme identification measures were also generally higher for pitch perception measures that included amplitude and frequency roving. The strongest correlations were observed for measures of complex tone F0 discrimination with phoneme identification in temporally gated SSN. The results of this study suggest that musical training or signal processing strategies that improve F0 discrimination should improve consonant identification in fluctuating noise.