- 期刊
Effects of Frequency Allocation with an Extended Low Frequency Range on Syllable-initial Consonant Identification by Mandarin-speaking Pediatric Cochlear Implant Users
頻率配置對於人工耳蝸植入兒童國語子音辨識能力之影響
摘要
背景：根據之前研究，我們發現使用低頻延伸之頻率配置(frequency allocation)有助於人工耳蝸植入兒童其國語聲調(lexical tones)之辨識能力。本研究進一步探討低頻延伸之頻率配置對於國語子音辨識能力的影響。 方法：15名植入人工耳蝸之學語前失聰兒童參與本研究。比較受試者於以下兩種不同頻率配置設定(mapping)的子音辨識正確率：(i)實驗組，將頻率配置設定於低頻延伸範圍（233至8，501 Hz）(ii)對照組，將頻率配置設定於一般臨床使用範圍（300至8，404 Hz）。 結果：於實驗組，子音辨識正確率平均爲81.94% (SD=10.29%)。於對照組則爲77.11% (SD=12.14%)。實驗組之子音辨識能力平均高於對照組4.83% (SD=6.29%)，達顯著統計差異。 結論：本研究結果支持人工耳蝸植入兒童使用低頻延伸之頻率配置後，除有助於國語聲調辨識能力之外，對於國語子音辨識能力並無不良影響。同時，本研究結果亦提供證據支持低頻延伸之頻率配置運用於增進國語子音辨識能力之臨床實用性。
並列摘要
BACKGROUND: To determine the effects of frequency allocation with an extended low-frequency range on consonant identification by Mandarin-speaking pediatric CI recipients. METHODS: Fifteen prelingually deafened, pediatric CI recipients participated in this study. Each patient's accuracy in consonant identification was compared in two conditions: (i) The experimental condition, where participants were mapped with an extended frequency range from 233 to 8,501 Hz, and (ii) the control condition, where participants were mapped with their clinically assigned frequency range from 300 to 8,404 Hz. RESULTS: The group mean of pediatric CI users’ consonant identification accuracy was 81.94% (SD=10.29%) in the experimental condition, and was 77.11% (SD=12.14%) in the control condition. The group mean was 4.83% (SD=6.29%) higher in the experimental condition than that in the control condition; this difference was statistically significant (t(14)=2.98, p=0.010). CONCLUSIONS: The present findings indicated that frequency allocation with extended frequency ranges under quiet situation does not introduce adverse effects on the same group of CI users' performance in recognizing contrasts in Mandarin syllable-initial consonants. Together, these findings suggest the potential clinical usefulness of frequency allocation with extended low-frequency range in pediatric CI users' recognition of Mandarin consonants.
延伸閱讀
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