Abstract

UG and the logical problem of L2 acquisition As discussed in chapter 1, UG is motivated on learnability grounds: the subtle and abstract knowledge attained by native speakers goes far beyond the input that they receive as young children. In L2 acquisition, learners are faced with a similar task to that of L1 acquirers, namely the need to arrive at a system accounting for L2 input. In addition, L2 learners are also faced, at least potentially, with a logical problem of language acquisition, in that there are abstract, complex and subtle properties of grammar that are underdetermined by the L2 input (Schwartz and Sprouse 2000a, b; White 1985a, 1989). If it turns out that the L2 learner acquires abstract properties that could not have been induced from the input, this is strongly indicative that principles of UG constrain interlanguage grammars, parallel to the situation in L1 acquisition. This is true even if the linguistic competence of L2 learners differs from the linguistic competence of native speakers. In other words, it is not necessary for L2 learners to acquire the same knowledge as native speakers in order to demonstrate a poverty-of-the-stimulus situation in L2 acquisition; it is sufficient to show that L2 learners acquire complex and subtle properties of language that could not have been induced from the L2 input.

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