This study examines the acquisition of utterance-level pitch patterns in Mandarin Chinese by American second language (L2) learners. It is an exploratory study with the goal of identifying the utterance-level prosody in L2 Mandarin Chinese. The focus of this study is not on the pitch patterns of individual learners but those of subject groups. The analysis shows that the pitch patterns between two syntactic structures for the same tone sequence vary with the tone sequence and the subject group. The biggest difference between first language (L1) and L2 Mandarin Chinese lies in the frequency of target undershoot in L2 speech. The infrequent tone target undershoot in L2 speech, especially among the intermediate learners, was attributed to the incomplete acquisition of L2 prosody. It was argued that the infrequent tone target undershoot may render L2 speech more staccato or robot-like, which contributes to the perception of a foreign accent in L2 Mandarin Chinese.

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