Language transfer is the application of linguistic features from one language to another by a bilingual or multilingual speaker and may occur across both languages in the acquisition of a simultaneous bilingual. It may also occur from a mature speaker's first language (L1) to a second language (L2) they are acquiring, or from an L2 back to the L1. Language transfer (also known as L1 interference, linguistic interference, and crosslinguistic influence) is most commonly discussed in the context of English language learning and teaching, but it can occur in any situation when someone does not have a native-level command of a language, as when translating into a second language. Language transfer is also a common topic in bilingual child language acquisition as it occurs frequently in bilingual children especially when one language is dominant.
Types of language transfer
When the relevant unit or structure of both languages is the same, linguistic interference can result in correct language production called positive transfer: here, the "correct" meaning is in line with most native speakers' notions of acceptability. An example is the use of cognates. However, language interference is most often discussed as a source of errors known as negative transfer, which can occur when speakers and writers transfer items and structures that are not the same in both languages.
Negative transfer Within the theory of contrastive analysis, the systematic study of a pair of languages with a view to identifying their structural differences and similarities, the greater the differences between the two languages, the more negative transfer can be expected. For example, in English, a preposition is used before a day of the week: "I'm going to the beach on Friday." In Spanish, instead of a preposition the definite article is used: Voy a la playa el viernes. Novice Spanish students who are native English-speakers may produce a transfer error and use a preposition when it is not necessary because of their reliance on English. According to Whitley, it is natural for students to make such errors based on how the English words are used. Another typical example of negative transfer concerns German students trying to learn English, despite being part of the same Germanic language family. Since the German noun Information can also be used in the plural – Informationen – German students will almost invariably use informations in English, too, which would break the rules of uncountable nouns. From a more general standpoint, Brown mentions "all new learning involves transfer based on previous learning". That could also explain why initial learning of L1 will impact L2 acquisition.
Positive transfer The results of positive transfer go largely unnoticed and so are less often discussed. Nonetheless, such results can have an observable effect. Generally speaking, the more similar the two languages are and the more the learner is aware of the relation between them, the more positive transfer will occur. For example, an Anglophone learner of German may correctly guess an item of German vocabulary from its English counterpart, but word order, phonetics, connotations, collocation, and other language features are more likely to differ. That is why such an approach has the disadvantage of making the learner more subject to the influence of "false friends", words that seem similar between languages but differ significantly in meaning. This influence is especially common among learners who misjudge the relation between languages or mainly rely on visual learning. In addition to positive transfer potentially resulting in correct language production and negative transfer resulting in errors, there is some evidence that any transfer from the first language can result in a kind of technical, or analytical, advantage over native (monolingual) speakers of a language. For example, L2 speakers of English whose first language is Korean have been found to be more accurate with perception of unreleased stops in English than native English speakers who are functionally monolingual because of the different status of unreleased stops in Korean from English. That "native-language transfer benefit" appears to depend on an alignment of properties in the first and the second languages that favors the linguistic biases of the first language, rather than simply the perceived similarities between two languages.
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