 Their results showed that Chinese-English bilinguals who had been exposed to English after puberty, learned vocabulary to a higher competence level than syntactic aspects of language.They do, however, report that the judgment accuracies in detecting semantic anomalies were altered in subjects who were exposed to English after sixteen years of age, but were affected to a lesser degree than were grammatical aspects of language.It has been speculated by and that semantic aspects of language are founded on associative learning mechanisms, which allow lifelong learning, whereas syntactical aspects are based on computational mechanisms, which can only be constructed during certain age periods.