英語詞彙重音（lexical stress）是影響口語可理解性的重要因素。然而，泰國學習者在英語外來詞的重音產出上經常遭遇困難，主要原因在於他們傾向將泰語的音韻模式遷移至英語發音。本研究旨在探討泰國高中生在英語外來詞詞彙重音上的表現，並檢驗一項結合 YouTube 教學影片與 ChatGPT 人工智慧輔助回饋之四週發音教學介入的成效。本研究採準實驗之前測－後測研究設計，共有 30 名泰國高中生參與。學生於教學介入前後完成發音錄音。詞彙重音正確率透過聽辨評分進行評估，而重音的聲學特徵（音高、音強與時長）則使用 Praat 軟體進行分析。研究資料以描述性統計及成對樣本 t 檢定進行分析，比較前測與後測之差異。研究結果顯示，學生的平均重音正確率由前測的 0.20 顯著提升至後測的 0.51，t(29) = −5.89，P = .000002。聲學分析結果顯示，音高與時長略有增加，但未達統計顯著差異；相較之下，音強則於教學介入後呈現顯著下降。整體而言，本研究結果顯示，結合 YouTube 教學與 ChatGPT 人工智慧回饋之發音教學能有效提升泰國學習者英語外來詞之詞彙重音表現，並為泰國英語作為外語（EFL）課堂中的發音教學提供一項具實務價值的教學模式。

English lexical stress is an important feature of intelligible speech. However, Thai learners often have difficulty producing correct stress in English loanwords because they tend to transfer Thai phonological patterns to English pronunciation. This study investigated Thai high school students’ production of lexical stress in English loanwords and examined the effects of a four-week pronunciation intervention integrating YouTube-based instructional videos and AI-assisted feedback through ChatGPT. A quasi-experimental pretest-posttest design was employed with 30 Thai high school students. Students completed pronunciation recordings before and after the intervention. Stress placement accuracy was evaluated through perceptual ratings, while acoustic features (pitch, intensity, and duration) were analyzed using Praat. Descriptive statistics and paired-samples t-tests were used to compare the pretest and posttest results. The findings showed that students’ mean stress accuracy improved significantly from 0.20 in the pretest to 0.51 in the posttest, t(29) = −5.89, p = .000002. The acoustic analysis revealed slight increases in pitch and duration, although these changes were not statistically significant. Intensity decreased significantly after the intervention. Overall, the findings suggest that integrating YouTube-based instruction with AI-assisted feedback can effectively improve Thai learners’ lexical stress placement and provide a practical approach to pronunciation instruction in Thai EFL classrooms.

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