Second language( L2) learners bring knowledge of the world to the task of learning new ways to talk about the world. First language (L1) learners receive hours of naturalistic exposure to language from caregivers who scaffold their development.
The unit focused on the differences between the acquisition of first and second languages. In first language acquisition children are acquiring knowledge about the world at the same time that they are acquiring language.
Exposure to the target language for second language learners varies, both in quantity and in quality, depending upon the context. Children are motivated to become native speakers of the language spoken around them. As teachers take into account the outcome of second language learning depends on age, input, L1 and L2 proximity or distance, motivation,expectations, individual differences in memory, in personality, etc.
Some of the differences between first language and L2 acquisition are intrinsic and cannot be avoided; some are, so to speak, accidental in that they vary according to the circumstances in which L2 acquisition takes place, in particular inside or outside a classroom.
Finally, L1 acquisition has seen continual controversy over the links between language development and social and cognitive development it attempts to isolate language from other cognitive systems. To them the controversy concerns maturity of the language faculty itself, whether it is essentially the same from birth, just requiring language experience or exposure.
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