Các dữ liệu cho thấy rằng trẻ em với kinh nghiệm thính giác tăng lên trước khi cấy cũng phát triển bài phát biểu tốt hơn. Nó sau đó đã được thể hiện bởi Tye-Murray et al (1995) có cải thiện intelligibility ở trẻ em đã sử dụng Nucleus 22 hệ thống trong 2 năm hoặc lâu hơn, và trong những người đã được cấy ghép | Speech Production with Cochlear Implants 745 strategy on Nucleus 22 implant were reported by Tobey et al 1988 1991 and Tobey and Hasenstab 1991 . The speech production of children was categorized from the phonologic level evaluation Ling 1976 . Of the 61 children in the study 31 had a significant improvement in imitative nonsegmental speech production and 67 in segmental speech production 1 year after implantation Tobey et al 1988 1991 Tobey and Hasenstab 1991 . Approximately half had significant improvement in spontaneous speech production. The data suggested that children with increased auditory experience before implantation also developed better speech. It was subsequently shown by Tye-Murray et al 1995 that there was improved intelligibility in children who had used the Nucleus 22 system for 2 years or longer and in those who had been implanted before the age of 5 years. Multipeak-MSP Nucleus As with the formant strategies there was also considerable variability in performance. Osberger et al 1994 found speech intelligibility scores of 48 for children who had the Nucleus F0 F1 F2 WSP-III and Multipeak-MSP systems for at least 2 years. This score was well below that for hearing children of the same age. The ratings varied from 14 to 93 intelligible. Thus some children perform as well as hearing children. Over a 6-year period Blamey et al 2001a assessed the progress in speech production of nine children with the Nucleus 22 system. Initially two used the F0 F1 F2 strategy and seven the Multipeak. At 3 years postimplantation all were using the Multipeak and by 6 years they had been converted to SPEAK. A broad transcription of the conversations was used to measure the percentage of correct productions of monophthongs diphthongs singleton consonants consonant clusters and whole words. A direct measure of intelligibility was also derived by counting the proportion of syllables that were unintelligible to the transcribers. The conversation was transcribed by a speech
