This study examines the effects of task complexity on second language (L2) pronunciation accuracy and global pronunciation measures in pronunciation-unfocused tasks and assesses the relationship between acoustic and listener-based pronunciation measures. Eighty-two Catalan/Spanish learners of English performed simple and complex versions of a problem-solving monologic speaking task, for which the oral stops /p, t, k/ and vowel contrasts /iː/-/ɪ/ and /æ/-/ᴧ/ were embedded in the lexical items used to perform the task. Pronunciation accuracy was gauged through acoustic measurements of laryngeal timing (voice onset time), vowel contrastiveness and nativelikeness (Mahalanobis distances), and native speakers’ ratings of comprehensibility and accentedness. Results revealed detrimental effects of increased task complexity on the productions of oral stops and speech comprehensibility and accentedness; however, no consistent task complexity effects were found on vowel accuracy. The analysis also revealed an association between segmental accuracy and global dimensions of L2 speech.

中文翻译：

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在发音不集中的口语任务中，L2 发音是否受到任务复杂性增加的影响？


本研究考察了任务复杂性对发音不集中任务中第二语言 （L2） 发音准确性和整体发音测量的影响，并评估了声学发音测量和基于听众的发音测量之间的关系。82 名加泰罗尼亚语/西班牙语英语学习者执行了简单和复杂版本的解决问题的单逻辑口语任务，其中口语塞音 /p、t、k/ 和元音对比 /iː/-/ɪ/ 和 /æ/-/ᴧ/ 嵌入到用于执行任务的词汇项目中。发音准确性是通过对喉时间（发声时间）、元音对比度和母语相似度（Mahalanobis 距离）以及母语人士对可理解性和口音的评分来衡量的。结果揭示了任务复杂性增加对口语停顿的产生以及语音理解和口音的不利影响;然而，没有发现对元音准确性的一致任务复杂性影响。该分析还揭示了 L2 语音的分段准确性和整体维度之间的关联。