Objective Event related potentials (ERP), especially mismatch negativity (MMN), as index, was utilized to study the processing of Chinese tones recognized by cochlear implant (CI) users and normal hearing subjects. Methods The auditory materials were Chinese words with four tones consisting of three different oddball blocks. The ERP and MMN of CI users and normal hearing subjects were recorded and analyzed in relation to the discrimination of those tones as tested. Results The ERP and MMN of CI users and normal hearing subjects were presented. The MMN of CI users includes two negative waves: the first negative wave (MMN1) occurred approxi-mately 100 ms, and the second wave (MMN2) at 300 ms. The MMN of normal hearing subjects includes two nega-tive waves too: the first negative wave (MMN1) occurred approximately 150 ms, and the second wave (MMN2) al-so at 300 ms. The MMN1 peak latency of CI users was obviously shorter than that of normal hearing subjects and the MMN2 peak latency of CI users shorter than that of normal hearing subjects too, but the difference of MMN2 peak latency between CI users and normal hearing subjects was not as significant as that of MMN1. Conclusion In the preattentive stage, CI users could process Chinese tones as normal hearing subjects, but compared with the pro-cessing of normal hearing subjects, there are some differences in the processing of CI users.%目的 应用事件相关电位(event related potentials,ERP),特别是失匹配负波(mismatch nagtive,MMN)为指标,对人工耳蜗植入者和正常对照组的汉语声调识别进行研究.方法 刺激材料为汉语四声调字,采用oddball范式,组成三个不同刺激组合,记录14名人工耳蜗植入者和14名听力正常的受试者对声调信息加工的ERP和MMN.结果 人工耳蜗植入者和正常人都能得到明显的ERP和MMN.人工耳蜗植入者MMN含有两个负波,分别在100和300 ms左右出现;正常人MMN也含有两个负波,分别在150和300 ms左右出现.人工耳蜗植入者的MMNl潜伏期明显提前,MMN2潜伏期提前但不如MMNl提前的程度大;人工耳蜗植入者对二、三,四三种声调加工的MMN第一、第二个负波的潜伏期、振幅差异无显著统计学意义,正常组也是如此.结论 人工耳蜗植入者能够在前注意阶段对汉语声调进行加工,但与正常人相比有所差别.
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