中文摘要：

目的多导人工耳蜗对言语信号中的声调不能有效地提取并体现，本文探讨可能影响讲声调语言的儿童在人工耳蜗植入后的声调的发育状况。方法受试者为4例接受了人工耳蜗植入的语前聋患儿及7例同年龄组（3～9岁）的正常听力儿童。对受试者用10个音节发四声所录取的共40个语音样本的基频（F0）进行分析，F0的提取方法为自相关分析法。此外，正常成人对受试儿童的四声发声进行了主观评判。结果正常听力儿童的四声发声呈典型的（1）高平、（2）上升、（3）低谷及（4）下降四种形式，而人工耳蜗植入患儿四声发声从混乱无章至接近正常均有体现；正常听力成人对受试儿童的四声发声主观评判的结果表明，正常儿童的四声发声被认为准确无误，而人工耳蜗植入患儿则从毫无声调至接近正常均有分布。结论人工耳蜗植入后儿童的声调发声有不同程度的障碍，大量病例的进一步研究将有助于阐明个体差异的原由。

英文摘要：

Objective Tone or pitch information in speech signals is not explicitly extracted and represented in the contemporary multichannel cochlear implant systems. The purpose of the present study is to investigate tone production in tone-language-speaking children with cochlear implants. Methods Speech samples were recorded from four cochlearimplant children and seven normal-hearing children of 4 to 9 years of age. All subjects were native Mandarin speakers. The speech samples, consisting of four Mandarin tones of 10 syllables, were subject to acoustic analysis of the fundamental frequency （F0）. In addition, four normal-hearing native Mandarin-speaking adults performed tone intelligibility test in which they listened to the speech materials from the children and judged the intelligibility of the children＇s tone production. Results The normal-hearing children produced the typical four tone patterns of Mandarin Chinese, i.e., （1） high and flat, （2） rising, （3） low and dipping, and （4） falling. The F0 patterns produced by the children with cochlear implants, however, tended to be flat with some other irregular patterns. The tone production for the normal-hearing children was considered to be perfect in the intelligibility judgments whereas the cochlear-implant children showed degraded intelligibility of tone patterns. Conclusion This preliminary study indicated that there is a remarkable deficit in tone production in prelingually-deafened children with cochlear implants whose native language is a tone language. Further studies with a large number of subjects are necessary to determine factors that might contribute to the individual differences in tone production in children with cochlear implants.