Input variability is key in many aspects of linguistic learning, yet variability increases input complexity, which may cause difficulty in some learning contexts. The current work investigates this trade-off by comparing speaker variability effects on L2 vocabulary learning in different age groups. Existing literature suggests that speaker…

Research has consistently shown there is a negative correlation between age of onset (AO) of acquisition and ultimate attainment (UA) of either pronunciation or grammar in a second language (L2). A few studies have indeed reported nativelike behavior in some postpuberty learners with respect to either phonetics/phonology or morphosyntax, a result…

Research has suggested child but not adult immigrants to the U.S. and Canada make regular progress learning English as their length of residence (LOR) increases. Compared groups of Chinese adults living in the United States who differed in length of residence LOR to assess the role of input in adult's naturalistic acquisition of a second language…