Prevalence
It is estimated that half of the world is functionally bilingual, and the majority of those bilinguals are 'Beliefs about simultaneous bilingualism
Some populaImportance
Studying bilingual acquisition is important because it may have real effects on academic performances foBilingual acquisition
According to De Houwer, there is no established normal development pattern for simultaneous bilinguals.De Houwer 1996, sec. 7. However, similarLanguage input in bilingual acquisition
The most influential factor in bilingual language acquisition is the languages spoken by parents to their children, and the languages spoken by others with whom the child comes into contact. This language exposure is called comprehensible input. In a 1984 edition of ''Bilingual Education Paper Series,'' Carolyn Kessler claimed that "children develop faster in the language which is used most in their environment",Kessler qtd. in De Houwer 1996, sec. 4.3. which may or may not reflect the language of the surrounding community. However, bilingual acquisition can also be affected by the amount of input, the separation of input, and the stability of input, as well as attitudes about bilingualism.Amount of language input
It is important to consider amount of input, because not only do the languages of each person affect bilingualism; the amount of time each main input carrier spends with the child also has an effect. It may be the amount of exposure to each language that is the factor for whether or not a bilingual child develops similarly to a monolingual child in each of those languages. Research has shown that children who are exposed less to a language will have "significantly lower receptive vocabulary scores for" that language. By contrast, the receptive vocabulary of bilingual children does not appear to be different from that of monolingual children when 40% to 60% of their language exposure is to that language. Vocabulary size in each language appears to be affected by both the "frequency of exposure" and the "differences in context of exposure" to that language. Varying contexts of exposure provide more opportunities for bilingual children to learn more words. Bilinguals who are exposed to more of one language than another will perform similarly on tasks to monolinguals of that language, but they will lag behind in vocabulary of the other language.Umbel, 1992 In addition to exposure, research has shown that the context of the language exposure and language use also affects vocabulary. Particularly, studies have shown that vocabularies seem to be separated by a "home context" versus a "school context", depending on what language input they are getting in each. Because this pattern was seen across children with different language backgrounds, this suggests the differences in receptive vocabulary could not be attributable to the different cultural contexts, which has been suggested as an alternative explanation.Separation of language input
There is a spectrum ranging from zero to total separation of language by person. Usually, a simultaneous bilingual child's situation is somewhere in the middle.De Houwer 1996, sec. 4.2. SomeInput stability
A change in a child's linguistic environment can trigger language attrition. Sometimes, when input for one language is lost before the final stage of development, children may lose their ability to speak the "lost" language. This leaves them able to speak only the other language, yet fully capable of understanding both.Attitudes
The parents' expectations and knowledge about language development can be instrumental in raising simultaneously bilingual children. Parental attitudes toward "their roles and linguistic choices" also play a part in the child's linguistic development. The attitudes of the child's extended family and friends have been shown to affect successful bilingualism. The extent to which a language is valued also has an effect on language acquisition in bilingual children. Languages that are deemed more useful or more important will dominate the bilingual mental lexicon while the less valued ones will not be acquired as fully. Studies have shown that children showed slower receptive vocabulary development in what they termed the 'minority' language while the children showed monolingual-like development in the 'majority' language. This has been attributed to the lack of opportunities bilinguals had available for the acquisition and development of their 'minority' language. Other studies have found that in a context where both languages are valued, the acquisition of the languages is not affected. This may be because there are more opportunities to use both languages.Theories of simultaneous bilingual acquisition
Unitary language system hypothesis
Virginia Volterra and Traute Taeschner put forth an influential study in 1978, positing that bilingual children move from a stage where the two languages are lexically mixed into eventual structural differentiation between the languages. They theorized that until age two, a child does not differentiate between languages.De Houwer 1996, sec. 5.2. There are 3 main stages identified by this hypothesis: Stage One – L1 and L2 comprise one language system until approximately 3 years of age. Stage Two – L1 vocabulary separates from L2 but the grammar remains as one language Stage Three – The language systems become differentiated. The child is fully bilingual This "unitary language system hypothesis" has been the subject of much debate in the linguistic world. Since its publication, this system has been discredited, and current linguistic evidence now points to two separate language systems.Dual language system hypothesis
In contrast, the dual language system hypothesis states that bilinguals have a separate system for the L1 and L2 which they learn right from the start, so both languages can be acquired simultaneously. Research on vocabulary development have generally provided strong support for this theory. Monolingual children in early language development learn one term for each concept, so does a bilingual child, just that the bilingual child does so for both L1 and L2, and hence they know two language terms of the same concept that has similar meaning, which is also known as translational equivalents. The awareness of synonyms do not appear till a much later age. For example, they know that both 'two' in English and 'dos' in Spanish refer to the numerical number '2'. This theory has been further supported by research on the acquisition of the grammatical and morphological components of language.Fromkin, Victoria, Robert Rodman, and Nina Hyams. An Introduction to Language. 10 edition. Boston, MA: Wadsworth Publishing, 2013. Print. By analyzing the speech of bilingual children where elements of the two languages differ, studies have revealed that children tend to incorporate the appropriateBilingual acquisition versus monolingual acquisition
The study of simultaneous bilingualism supplements general (monolingual) theories of child language acquisition. It particularly illuminates the critical role of the nature of language input in language development. This indicates that the form of language input must be similarly influential in monolinguals.Difficulties
However, it has proven difficult to compare monolingual and bilingual development, for a number of reasons: *Many languages have little data *The data that exist may not represent the normal population of children *There are contradictions in the literature concerning normal monolingual development *There are a large number of variables between bilingual and monolingual children besides the number of languages they speak *It can be difficult to differentiate between universal developmental processes and cases of language transferFindings
Meisel claims "there is no reason to believe that the underlying principles and mechanisms of language development n bilingualsare qualitatively different from those used by monolinguals." Döpke has hypothesized that communication styles that facilitate monolingual development are a major variable in successful bilingual development. Meisel proposed in a 1990 article that "bilinguals tend to focus more on formal aspects of language and are therefore able to acquire certain grammatical constructions faster than many or most monolinguals." One area of language acquisition that has been studied extensively is the use of the disambiguation heuristic, which is the tendency by children to "associate a novel word with a novel object". This tendency has been observed in numerous studies conducted with monolingual children; however, it appears that bilingual children either somewhat use it or don't use it at all. Byers‐Heinlein & Werker (2009) studied 48 17 and 18-month-old monolingual (English), bilingual, and trilingual (22 diverse languages) infants to compare their patterns on disambiguation. They studied infants at this age because this is when the heuristic has been shown to appear in monolingual infants. Additionally, they studied bilinguals from multiple diverse language backgrounds to show that the patterns were not language-specific but rather characteristic of bilingualism in general. they found that monolinguals showed disambiguation, bilinguals somewhat, and trilinguals did not. Byers‐Heinlein & Werker (2009) hypothesized that this was particularly an effect of translation equivalents (knowing the name for something in more than one language), as "they represent a departure from the one-to-one mapping between word and concept that is typical of monolingual vocabularies" (p 820). Indeed, in a later study conducted by Byers-Heinlein & Werker (2013) in 17–18 month-old Chinese-English bilingual infants, results showed that disambiguation did not occur in the infants who "understood the translation equivalents for more than half of the words in their vocabularies" (p. 407), while disambiguation occurred in those who knew fewer translation equivalents. They also suggested that the reverse could be possible—that infants who employed the heuristic were the ones that did acquire the translation equivalents because of the high level of one-to-one mapping. also say that disambiguation and language exposure are not correlated, but the presence or absence of translation equivalents could be attributed by the amount of exposure in each language the child gets. Particularly, if children receive more exposure in both languages, they are likely to have both words for a given object or concept, but if they have less exposure in one language they will likely lack the appropriate amount of translation equivalents, thereby exhibiting disambiguation.Bilingual lexical representations
One particularly fascinating aspect is determining how lexical structures are represented in the brains of bilinguals versus monolinguals, as bilinguals must map two different languages. Particularly, researchers have been interested in determining if a bilingual individual has two separate lexicons for each language or one containing both. found that the language input children received was important in "determining how independent one language will be from the other in the child's mind" (p. 646). Research on how lexical items are accessed in a bilingual brain has tended toward a mixed representation, where there is interconnectivity and some overlapping of the two lexicons but other items stay separated. Spreading activation, a process where similar concepts are activated when their neighbors are activated, is a widely accepted model of lexical access. It has been shown in both bilingual and monolingual individuals, with bilinguals showing activation in both languages during language research tasks. Multiple studies have shown that bilinguals recognize cognate words more quickly than non-cognate words, especially identical cognates, which produce the strongest effect. These effects occurred even when the participants knew ahead of time what language the target words would be in.Von Holzen, 2012 Despite the specific language contexts, both languages are activated, showing that lexical access is not language-specific and that top-down processing is important in lexical access. Findings suggest that the amount of activation that occurred cross-linguistically was related to the similarity between the translation equivalents of the languages. These findings suggest that when bilinguals read sentences, the language of the sentence does not necessarily act as an early cue for the restriction of the individual's lexical search to one language or the other. Rather, this decision is made later. This is similar to semantic priming in monolinguals. When monolinguals read a sentence that is semantically ambiguous (for example, in the sentence He saw the bug "bug" could mean insect or could mean a spy device), they will prime both meanings of the word and then later narrow it down to one. It is first a parallel process and then a serial process. When bilinguals read sentences, they go through a similar process with which language they should interpret the sentence. This interconnectivity of both languages in the bilingual brain can also have effects on the way concepts are represented in the bilingual mind. There is a mutual influence that seems to occur in the bilingual brain. Studies of categorization by bilinguals show that categories are simplified in the brains of bilinguals compared to monolinguals. Specifically, the corresponding category centers (examples of typical category exemplars) were closer together for bilinguals than monolinguals. Additionally, bilinguals showed a pattern of having "less complex category boundaries" (p. 270), which is where atypical exemplars would be placed, and "more similar centers of corresponding categories" (p. 288) than monolinguals. This shows the mutual influence that two languages can have on the representation of concepts in the brain.Ameel, 2009 Many have suggested that bilinguals have weaker connections in their lexical representations than monolinguals (Bialystok, Luk, Peets, & Yang, 2010; Ameel, Malt, Storms, & Van Assche, 2009). It is believed that this is because bilinguals get less practice with each language because they use each less often than a monolingual person uses their language, giving them half of the opportunity "to receive feedback in each language" and deepen their "mappings between words and objects in each language" (p. 272). The findings of cross-lingual activation can be used as support for a model of interconnectivity of a bilingual individual's languages in their mental lexicon. The two languages are "not separate and encapsulated", but rather "interrelated and subject to interaction" (p. 272).Possible models for lexical representation
Van Holzen relates the following: ''Bilingual Model of Lexical Access (BIMOLA)'' This model suggests there are two "separate but interconnected lexicons" in the bilingual brain (p. 583). This, however, was discredited by a study done by Von Holzen & Mani (2012) because it does not provide a possible mechanism to explain the cross-language activation seen in studies of lexical access. ''Processing Rich Information from Multidimensional Interactive Representations (PRIMIR)'' This model suggests one integrated phono-lexical system that is organized based on the different characteristics of language input. This model "allows for both cross-language effects while also noting stronger within-language effects" (Von Holzen & Mani, 2012, p. 583) ''Revised Hierarchical Model'' This model suggests that first language words are linked to concepts while second language words are linked directly to first language words, not concepts, but the greater proficiency and skill a person has in the second language, the greater the link will be to the actual concepts themselves. This model can also be supported by research done on second language acquisition because when people learn new languages later in life they will learn translation equivalents and learn what certain words mean based on their first language words. ''Bilingual Interactive Activation + Model'' This model is similar to the revised hierarchical model and suggests the lexicon of a bilingual individual is integrated, containing the words for both languages. This accounts for the simultaneous parallel activation of both languages during language tasks, the late activation of language in semantic processing, and the lack of effects of code switching. This lack of cost for code switching is especially used because they argue that separate lexicons would cause a slower reaction time, which was not indicated in the findings.Dominance
Though the simultaneous bilingual child learns two languages at once, this does not mean that he or she speaks them with identical competence. It is common for young simultaneous bilinguals to be more proficient in one language than the other,Taeschner 1983, p. 4. and this is probably related to each child's relative exposure to each language; for example, many bilingual children are more proficient in the mother's than the father's language, arguably because their mothers assume most of the childcare responsibilities and/or simply spend more time with their children. The dominant language is almost always the language spoken by the greatest number of the people the child interacts with (generally the language the child is educated in). The child sees this language as most effective and begins to favor it. However, their dominant language need not be their L1. In addition, it is possible to show language dominance in one language for one domain and dominance in the other language for another domain. For example, a child may be dominant in his or her L1 at home, but in the school context, his or her L2 becomes the dominant language being used.Code-switching
Equivalency problems
Bilingual children often interject words from the other language when they do not know or cannot remember the equivalent, and when one language has no suitable equivalent in the other. Taeschner found that bilingual children prefer to insert elements of the other language rather than use simplified forms.Social norms
Code-switching has also been tied to the bilingual child's socialization process. According to Poplack, a bilingual child code-switches based on the perceived linguistic norms of the situation and the perceived bilingual ability of the hearer.Parental interaction
Children will mirror their parents in this aspect of speech. If a child's parents engage in code-switching in their own speech, this will affect the child's perception of the appropriateness of mixing languages.Further research
There is currently no differentiation of normal and deviant bilingual development. Further study into the effects of changing a child's linguistic environment could uncover the minimal language input required to maintain "active use potential" in a particular language. Simultaneous trilingualism is also possible. There is significantly less research in this area than in simultaneous bilingualism. However, trilingual language acquisition in young children has been shown to generally mirror bilingual acquisition.Hoffmann 2001, p. 1.See also
* Sequential bilingualism * Multilingualism * Monolingualism * Language acquisition * Second-language acquisition * Comprehensible inputReferences
Citations
Bibliography
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