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Ñݽ²Õß¼ò½é£º Dr. Li XU started his career as an Otologist at Beijing Tongren Hospital. He earned his Ph.D. in Neuroscience from University of Florida in 1999. After two years of postdoctoral fellowship at University of Michigan, he began to work as a faculty member at Ohio University in 2001. Dr. Xu is now an associate professor of Communication Sciences and Disorders at Ohio University. His current research focuses on speech, lexical tone, pitch, and music perception and production in cochlear implant users.

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Multichannel cochlear implant has helped to restore hearing to thousands of profoundly hearing impaired listeners. However, the electrical signals that reach the ears are drastically different from the acoustic signals the normal-hearing listeners experience. Prelingually deafened children have to learn how to produce speech sounds as well as vocal singing under the bionic hearing with the impoverished signals. The present studies examined the acoustic features of vowel production and vocal singing in Mandarin-speaking children with cochlear implants. Results show that most children produce the corner vowel fairly accurately whereas tremendous errors occur in the production of the non-peripheral vowels. While some prelingually-deafened children can develop vocal singing through the use of cochlear implants, their singing pitch shows large deviations from the targets and their pitch contour direction appears to be random.