In this article, I report an experimental study that examines the role that Universal Grammar (UG) plays in the early stages of the acquisition of Japanese as a second language (L2) by adult learners. The study addresses the issue of whether a nonparametrized principle of UG that is instantiated in the first language (L1) is active enough in the early stages of L2 learning to apply to phenomena for which there are no counterparts in the L1. The phenomenon investigated here involves case particle deletion in Japanese. The nominative case and accusative case contrast in terms of their omissibility--the latter can be freely dropped, whereas the former cannot. This contrast is regulated by the Empty Category Principle--a principle that exists in essentially the same form in English but that applies to a very different set of phenomena in that language. Not only did the L2 learners exhibit a statistically significant difference in the deletability of the nominative and the accusative cases, consistent with t...
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