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Human language has posed great challenges for learning sciences. It has long been noted that children acquire language with relative ease and rapidity and without effort or formal teaching while adult second language (L2) learners cannot. In particular, children show creativity in the course of first language (L1) acquisition, which goes far beyond the input that they are exposed to. This was dubbed as the poverty of the stimulus by Chomsky (1980), with an assertion that human’s knowledge about natural language grammar is supplemented with some sort of innate linguistic capacity. Chomsky (1965) put forth a hypothetical module called the language acquisition device (LAD), which enables human to acquire and produce language.