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Second-language acquisition

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Second-language acquisition, often called SLA or L2 acquisition, is the process of learning a language other than your native tongue. While the name suggests a "second" language, the term actually covers learning a third, fourth, or any subsequent language. SLA focuses specifically on what the learner does during this process. It is distinct from the methods used in formal language teaching, although teaching can certainly influence how a person acquires a language. Researchers study SLA to understand how humans develop linguistic knowledge. This field is broad and touches on many different areas of human life.

To understand how this works, researchers look through several different lenses. Cognitive approaches investigate how our memory and attention processes function during study. Sociocultural theories emphasize the importance of social interaction and immersion in a community. Meanwhile, linguistic studies examine both the innate and learned aspects of language itself. Individual factors also play a major role in how successful a learner becomes. These factors include a person's age, their level of motivation, and their unique personality traits.

One of the most important concepts in this field is interlanguage. Historically, people viewed learner mistakes as simply a broken version of the target language. However, the concept of interlanguage changed this view. Interlanguage refers to the unique linguistic system that grows in a learner's mind. It is not just a collection of random errors or a simple transfer of rules from a first language. Instead, it is a language in its own right with its own systematic rules. This system includes syntax, phonology, lexicon, and pragmatics.

The academic study of SLA is a relatively new sub-discipline of applied linguistics. Because it draws from psychology and education, it is an interdisciplinary field. While there is no single starting date, two specific works are considered instrumental. Pit Corder published a significant essay on the significance of learners' errors in 1967. Later, in 1972, Larry Selinker introduced the concept of interlanguage. Since the 1980s, the field has expanded to include many theories. These include universal grammar, connectionism, and skill acquisition theory.

Learning time and difficulty vary greatly depending on the specific languages involved. The Foreign Service Institute (FSI) has provided estimates for native English speakers. Category I languages, such as Italian or Swedish, require about 24 weeks or 600 class hours. Category II languages, like Swahili or Indonesian, take approximately 36 weeks or 900 class hours. Category III languages, such as Russian or Vietnamese, require about 44 weeks or 1100 class hours. The most difficult are Category IV languages, which include Arabic, Cantonese, Mandarin, Japanese, and Korean. These require about 88 weeks or 2200 class hours.

Adults learn languages differently than children who are learning their first language. Adults have mature minds and already possess a first language that shapes their thinking. This can lead to a phenomenon called the critical period hypothesis, which explains why adult pronunciation often remains non-native. When a learner's progress stops at a certain level, it is called fossilization. Interestingly, learning a new language can also change how you use your first language. This includes changes in pronunciation, syntax, or even hand gestures. Vivian Cook proposed the idea of multi-competence to describe these related mental systems.

Research also shows that there is often a specific sequence in how grammar is acquired. In English, for example, learners often follow a predictable order for certain structures. This sequence typically begins with the plural "-s" and moves through progressive "-ing" forms and irregular past tenses. Studies in the 1970s showed that this order remained similar across different native languages. This helped confirm that interlanguage follows its own internal logic. However, this order is not perfectly rigid for everyone. Factors like a learner's native language can make certain features, such as articles, more challenging to master.

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