四位華語人工電子耳嬰幼兒之典型喃語量化分析

本研究使用LENA全天候家庭式錄音系統，長期追蹤並蒐錄四位人工電子耳嬰幼兒之前語言期口語資料，分析其典型喃語之表現。研究共納入四位華語人工電子耳個案，皆屬感音神經性聽損，聽損程度為劣耳側極重度以上。本研究旨在量化個案的語音表現，包含：典型喃語比例變化、子音廣度、多音節喃語中重複音節與多變音節的比例，及進入喃語期後的語音變異複雜度。本研究以每月三次的頻率進行家中錄音。研究結果發現：1）四位人工電子耳個案於植入後2至5個月內（同於聽覺年齡12至14個月間）進入典型喃語期；2）進入典型喃語期時，出現於喃語中的子音廣度為4至12個；而四位個案常見構音位置為雙唇音與唇齒音，常見構音方式則為鼻音與塞音；3）僅一位個案於聽覺年齡12至13個月間，第一次出現明顯的多變音節喃語多於重複音節喃語之現象，及 4）進入典型喃語期時，子母音同時變異類別比例約為 11.11% 至30%。本研究希望透過前語言期分析所得的客觀數值，作為其他評估方式的輔助，提供人工電子耳個案於術後進步幅度的相關指標，進而協助臨床人員調整介入方向。

This study conducted a longitudinal investigation on prelinguistic vocalizations of four infants with cochlear implants (CIs) using LENA recording system. We included four variables: 1) the trends of canonical babbling ratio; 2) their consonant repertoires when reaching the canonical babbling stage; 3) the proportions by which reduplicated and variegated babbling take respectively in multisyllabic babbling, and 4) the complexity of their phonetic variations in canonical babbling. Recordings were collected three times every month for 12 to 14 months. Results showed that the onset of canonical babbling stage occurred 2 to 5 months post-implantation, and the consonant repertoire was about 4 to 12. Bilabials and labiodentals were the most commonly used places of articulation, and the majority of manners of articulation were nasals and stops. There was only one infant whose variegated babbling ratio was first noticeably higher than that of reduplicated babbling between 12-13 months of hearing age. The proportion of variations involved both consonant and vowel were 11.11% to 30%. In sum, we found two types of learning strategies used by the four subjects - ‘phonetic-oriented’ and ‘semantic-oriented’. Our findings aim to provide insights for clinical practitioners to focus more on the development during the prelinguistic period, as part of their evaluation routine to monitor subjects’ language progress post-implantation and adjusting their intervention goals if needed.