摘要
音高轮廓是用于判断声调的主要线索。人工耳蜗中的音高编码较为粗糙,导致耳蜗植入者的声调识别能力较差。最近有研究发现,当音高编码较差时,参照单字中基频轮廓的变化趋势来调整汉字的强度变化趋势可以影响声调判断。本研究招募了5位成年植入者,让他们听12个响度轮廓被调整的单字,它们的响度轮廓被沿着音高轮廓的反方向调整。在先前的对照实验中,健听者的声调判断不会受到响度调整的影响。然而本实验验证了,植入者有时可能根据响度轮廓而不是音高轮廓来判断声调。例如对于一个女声bú,健听者都认为是二声,而4/5的植入者认为是四声。
Pitch contour is the primary cue for lexical tone identification. The pitch coding in cochlear implants(CIs) is so coarse that CI users cannot identify lexical tones as well as normal hearing listeners. Some recent studies demonstrated that, when the pitch coding was poor, some manipulations of the intensity variation trend within individual monosyllabic word according to its pitch contour variation trend could influence the identification of lexical tones. In this study, five adult CI users were recruited. The stimuli were twelve Mandarin monosyllabic words, whose loudness contour were modified in the reverse direction of their pitch contour. In a pre-test session, the tone identification in normal hearing control listeners were found to be not influenced by this kind of loudness-contour manipulation. However, results of this experiment showed that CI users had the possibility to identify the tones according to loudness contour rather than pitch contour sometimes. For example, four of the five CI users identified a female word /bú/, which was a rising tone(i.e., Tone 2) for normal hearing listeners, as a falling tone(i.e., Tone 4).
引文
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