Why don't L2 learners end up with uniform and perfect linguistic competence?

Ping Li
1996 Behavioral and Brain Sciences  
AbstractChildren in a given linguistic environment all uniformly acquire their target language, but adult learners of L2 do not. UG accounts for children's uniform linguistic behavior, but it cannot serve a similar role in accounting for adult learners' linguistic behavior. I argue that Epstein etal.'s study does not answer the question of why L2 learners end up with nonuniform and imperfect linguistic competence in learning a second language.
doi:10.1017/s0140525x00043703 fatcat:admunush4bfvre5oo2elfy3bkm