Abstract This study utilized unidirectional association score ΔP to track perfective morpheme productivity in longitudinal spoken L2 Italian data. Research questions concerned whether early L2 perfectives were contingent upon telicity of predicates, whether lexeme–morpheme association changed as proficiency increased, and whether distribution of perfectives in the L1 input affected the patterns of morpheme emergence. Results showed that (i) the productive use of the perfective was contingent upon a few, infrequent telic predicates but also upon some actionally underspecified, very frequent general-purpose ones; (ii) a generalized decrease in association scores over time accompanied the productivity of the perfective morpheme; (iii) distribution of perfectives in L2 data did not reflect distribution in the L1 input. The statistical analysis adopted in this study is replicable to other domains where contingency of stem-affix alternations may provide cues for observing the developing L2 grammar

中文翻译：

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L2意大利语中的权变学习和完美语素生产力：关于与ΔP的词素-词素关联的研究

摘要 本研究利用单向关联分数 ΔP 来跟踪纵向口语 L2 意大利语数据中的完美语素生产力。研究问题涉及早期的二语完成词是否取决于谓词的特利性，词素-词素关联是否随着熟练程度的提高而改变，以及第一语言输入中完成词的分布是否影响词素出现的模式。结果表明 (i) 完成时的有效使用取决于少数不常见的目的谓词，但也取决于一些在行动上未指定的、非常频繁的通用谓词；（ii）随着时间的推移关联分数的普遍下降伴随着完美语素的生产力；(iii) L2 数据中完美词的分布不反映 L1 输入中的分布。