The present study examined whether early immersive L2 exposure in a foreign language learning context can yield long-term advantages in L2 morpho-syntactic sensitivity. Participants were 40 Korean university students with high English proficiency, who had either attended an English kindergarten or begun learning English in a classroom, and a control group of native English speakers. All participants performed a speeded aural grammaticality judgment task that included the following features: articles, subcategorization, plural -s, third-person -s. Results showed that the English-kindergarten group outperformed the late-classroom group in terms of accuracy for ungrammatical sentences, while the two groups did not differ significantly on grammatical sentences and in reaction time measures. The learners altogether scored higher in plural -s and third-person -s compared to articles. While the native speakers showed near-perfect accuracy and fast reaction times, the highly proficient learners were at near-chance level in detecting morpho-syntactic errors during online L2 aural processing.

中文翻译：

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发病年龄、暴露类型和 L2 形态句法敏感性的最终达到

本研究检验了在外语学习环境中的早期沉浸式 L2 暴露是否可以在 L2 形态句法敏感性方面产生长期优势。参与者是 40 名英语水平较高的韩国大学生，他们要么上过英语幼儿园，要么开始在课堂上学习英语，而对照组的母语为英语。所有参与者都执行了一项快速的听觉语法判断任务，其中包括以下特征：文章、子类别、复数 -s， 第三人称 -s. 结果表明，英语幼儿园组在不合语法句子的准确性方面优于晚班组，而两组在语法句子和反应时间测量方面没有显着差异。学习者在复数中的总得分更高——s和第三人称——s与文章相比。虽然母语者表现出近乎完美的准确性和快速的反应时间，但高度熟练的学习者在在线 L2 听觉处理过程中检测形态句法错误的机会水平接近。