Supplementary materials for the paper: "Learning second language morphosyntax in dialogue under explicit and implicit conditions: An experimental study with advanced adult learners of German". This repository contains: - all online appendices: - **S1: Task instruction in the explicit condition:** English translation (from Dutch) of the extra instruction page that informed the participants in the explicit condition about the true purpose of the study. - **S2: The unaware participant group:** A description of the unaware subgroup (n = 6) of the implicit condition, containing information about the participants’ language background, descriptive statistics of their performance data, as well as an interpretation thereof. - **S3: The 15-minute delayed posttest:** A description of the brief oral conjugation task that was administered 15 minutes after the main experimental task, including an explanation of why this task was discarded from the study, a presentation of descriptive statistics, as well as a (speculative) discussion of the results. - **S4: Model comparisons:** A detailed description of the model comparisons that were used to determine the structure of the final mixed-effects model, modelling the learning task data of the critical items. - **S5: Goodness of model fit:** An evaluation of the goodness of model fit of the critical items mixed-effects model. - **S6: Interpretation of model estimates:** A detailed explanation of how to interpret the estimates (logits, probabilities, odds) provided in the model output, and of how to understand the odds ratios as an indicator of effect size. - the **data** and **R code** of our analyses (also available on https://github.com/johannadevos/MorphosyntacticLearning/) - an English translation of the **awareness interview questions** in chronological order - a list of all verbs used as **items** in the experiment - supplementary tables: - **Table S1: Error coding:** An overview of the original error codes that the experimenter used to classify the participants’ productions of the German test verbs, and which were later recoded in a binary (0 = vowel error, 1 = no vowel error) way.