The present study takes a variationist perspective to explore the varietal repertoires of adult learners of German as a second language (L2), that is, their variable use of standard German, Austro‐Bavarian dialect, and mixture varieties. Forty L2 learners completed a virtual reality task involving interactions with dialect‐speaking and standard‐German‐speaking interlocutors. Using Bayesian multilevel modeling, the goal was to explore differential outcomes in the acquisition of sociolinguistic competence by determining whether participants adjusted their varietal behavior to match that of the interlocutor (i.e., varietal convergence). The results show that there were no interindividual addressee‐dependent convergence tendencies. A holistic person‐centered analysis of individual learners’ intraspeaker variation revealed that only select L2 learners adjusted their usage patterns but did not entirely invert their usage of dialect and standard language as a function of the variety of the interlocutor. Introspective qualitative data speak to potential drivers behind the differential development of L2 (multi)varietal repertoires.

中文翻译：

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第二语言的社会语言能力和品种库：利用虚拟现实对收件人依赖性品种行为进行的研究

本研究采用变体论的视角来探索德语作为第二语言（L2）的成人学习者的多样性，即他们对标准德语、奥地利-巴伐利亚方言和混合变体的不同使用。四十名第二语言学习者完成了一项虚拟现实任务，涉及与说方言和说标准德语的对话者进行互动。使用贝叶斯多级建模，目标是通过确定参与者是否调整其品种行为以匹配对话者的行为（即品种趋同）来探索获得社会语言能力的差异结果。结果表明，不存在个体间依赖于收件人的趋同倾向。对个体学习者的说话者内部差异进行的以人为中心的整体分析表明，只有特定的二语学习者调整了他们的使用模式，但并没有根据对话者的多样性完全颠倒他们对方言和标准语言的使用。内省的定性数据揭示了 L2（多）品种库差异化发展背后的潜在驱动因素。