This study examines the acoustic outputs in boundary coarticulation and attempts to explain the native and nonnative production differences in relation to speech planning. English consonant clusters across words produced by English (L1) and Mandarin (L2) speakers are analyzed. This study focuses on two segmental features (place of articulation and voicing) and computes three acoustic-based measurements (internal release, closure durations and closure shortening). The results find a lesser coarticulation degree in L2 production, and differing acoustic deviations varying with speakers’ proficiency level. The results also suggest that cross-word planning involving place of articulation is robust in both L1 and L2 production, while cross-word voicing encoding is not available in L2 speech. The asymmetry in L2 encoding is compatible with a competitive gestural selection analysis, and the implications of L1 production have been interpreted as in favor of a richer mental representation and finer-level execution than the syllable-sized programming. The preliminary results support the core assumption that L1 and L2 coarticulation differences arise from phonological and phonetic encoding. This study adds cross-linguistic output-based evidence on speech planning and encourages speech models to further specify the very late stage of phonetic encoding.

这项研究检查了边界清晰度中的声音输出，并试图解释与语音计划有关的本地和非本地生产差异。分析了英语（L1）和普通话（L2）说话者产生的单词之间的英语辅音簇。这项研究关注两个分段特征（发音和发声的位置），并计算三个基于声学的测量值（内部释放，闭合持续时间和闭合缩短）。结果发现，L2产生的共发音度较小，并且不同的声音偏差随扬声器的熟练程度而变化。结果还表明，涉及发音的跨字计划在L1和L2产生中都很健壮，而跨字语音编码在L2语音中不可用。L2编码中的不对称性与竞争性手势选择分析兼容，并且L1产生的含义已被解释为比音节大小的编程具有更丰富的思维表达和更精细的执行。初步结果支持核心假设，即L1和L2的发音差异是由语音和语音编码引起的。这项研究为语音计划添加了基于跨语言输出的证据，并鼓励语音模型进一步指定语音编码的后期。初步结果支持了核心假设，即L1和L2协同发音差异源自语音和语音编码。这项研究为语音计划添加了基于跨语言输出的证据，并鼓励语音模型进一步指定语音编码的后期。初步结果支持了核心假设，即L1和L2协同发音差异源自语音和语音编码。这项研究为语音计划添加了基于跨语言输出的证据，并鼓励语音模型进一步指定语音编码的后期。