The document discusses bilingualism and bilingual language acquisition in children. It covers several key topics: 1) Definitions of different types of bilingualism, such as coordinate vs. compound bilinguals and early vs. late bilinguals. 2) Debates around whether bilingual children initially have one unified or separate language systems. The unitary language system hypothesis argues they initially have one system that differentiates over time, while the separate systems hypothesis is that children differentiate languages from the start. 3) Language mixing in bilingual children and debates around whether it shows confusion or constrained grammatical competence in both languages.

1. Bilinguals and Bilingualism 1

2. Bilingualism Why do we study bilingualism? A large proportion of the world’s population knows and uses more than one language on a regular basis. Multilingualism is the norm. More than 140 languages are spoken in Manchester. Language planning (social and educational policy) is a political issue often based on academic research. The following slides show the increase in population of hispanics/latinos/as in the US since 1970. The increase has had a marked effect on discussions of bilingualism in the US. 2

3. 3 Hispanic Population in the United States: 1970 to 2050 Population in millions Projections Census *Projected Population as of July 1 Source: U.S. Census Bureau, 1970, 1980, 1990, and 2000 Decennial Censuses; PopulationProjections, July 1, 2010 to July 1, 2050

4. 4 Percent Hispanic of the Total Population in the United States: 1970 to 2050 Projections Census *Projected Population as of July 1 Source: U.S. Census Bureau, 1970, 1980, 1990, and 2000 Decennial Censuses; PopulationProjections, July 1, 2010 to July 1, 2050

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9. Bilingualism Topics in bilingualism Who is bilingual? What is a native language? How does a child acquire two languages? How does bilingualism influence a human being’s intellectual and mental growth? When and how should we learn a second language? Does a bilingual’s brain function differently from a monolingual’s brain? How and when do bilinguals switch from one language to the other? 9

10. Bilingualism True or False? Learning more than one language confuses a child and lowers his/her IQ? A child should learn one language properly before learning a second one. A person cannot be a real bilingual if he learns a second language late. Bilinguals have to translate from their weaker to their stronger language. Learning two languages may cause cultural identity problems for a child. 10

11. Bilingualism Approaches Linguistics – studies the structure and development of the two languages Psycholinguistics – studies the psychological basis of bilingual’s language competence and performance Sociolinguistics – looks at how cultures/social groups affect language performance and language choice Neurolinguistics – studies the relationship between language and the brain 11

12. Definitions Individual bilingualism vs Societal bilingualism Bilingualism as an individual attribute: a psychological state of an individual who has access to two language codes to serve communication purposes. Bilingualism as a societal attribute: two languages are used in a community and that a number of individuals can use two languages. Should bilingualism be defined at an individual or a societal level? 12

13. Definitions 5 dimensions Cognitive organisation of two languages Age of acquisition Language proficiency Sequence of acquisition of two languages Societal factors 13 Individual characteristics

14. Compound vs. Coordinate Bilinguals Compound bilingual: Has one semantic system but two linguistic codes. Usually refers to someone whose two languages are learnt at the same time, often in the same context. Coordinate bilingual: Has two semantic systems and two linguistic codes. Usually refers to someone whose two languages are learnt in distinctively separate contexts Subordinate bilingual: The weaker language is interpreted through the stronger language 14

15. The mental lexicon of monolinguals 15

16. The mental lexicon of bilinguals 16 Semantic System 1 Semantic System 2 Semantic system English Spanish English Spanish Compound bilingual Coordinate bilingual

17. The mental lexicon of bilinguals 17 Semantic system English Spanish Subordinate bilingual

18. The mental lexicon of bilinguals 18 Semantic System 2 Semantic System 2 Semantic System 1 Semantic System 1 English Spanish English Spanish

19. The mental lexicon of bilinguals Whether there are two or more systems depends on: Age of acquisition Learning/teaching method Similarities and differences between the two languages 19

20. Early vs. Late bilinguals Early bilingual: someone who has acquired two languages early in childhood (usually received systematic training/learning of a second language before age 6). Late bilingual: someone who has become a bilingual later than childhood (after age 12). Discussion: Is there a “critical period” for second language learning? 20

21. Early vs. Late bilinguals 21 How do we determine the age of acquisition?

22. Balanced vs. Dominant bilinguals Balanced bilingual: someone whose mastery of two languages is roughly equivalent. Dominant bilingual: someone with greater proficiency in one of his or her languages and uses it significantly more than the other language. Semilingual: someone with insufficient knowledge of either language. 22

23. Successive vs. Simultaneous bilinguals Successive bilingualism: Learning one language after already knowing another. This is the situation for all those who become bilingual as adults, as well as for many who became bilingual earlier in life. Sometimes also called consecutive bilingualism. Simultaneous bilingualism: Learning two languages as "first languages". That is, a person who is a simultaneous bilingual goes from speaking no languages at all directly to speaking two languages. Infants who are exposed to two languages from birth will become simultaneous bilinguals. Receptive bilingualism: Being able to understand two languages but express oneself in only one. This is generally not considered "true" bilingualism but is a fairly common situation. 23

24. Additive vs. Subtractive bilinguals Additive bilingual: The learning of a second language does not interfere with the learning of a first language. Both languages are well developed. Subtractive bilingual: The learning a second language interferes with the learning of a first language. The second language replaces the first language. Additive or subtractive bilingualism is related to the different status associated with the two languages in a society. 24

25. Elite vs. Folk bilinguals Elite bilingual: Individuals who choose to have a bilingual home, often in order to enhance social status. Folk bilingual: Individuals who develop second language capacity under circumstances that are not often of their own choosing, and in conditions where the society does not value their native language. 25

26. Summary: Definitions Coordinate vs. Compound bilingualism Early vs. Late bilingualism Balanced vs. Dominant bilingualism Simultaneous vs. Successive bilingualism Additive vs. Subtractive bilingualism Elite vs. Folk bilingualism 26

27. Language acquisition of bilingual children Bilingual acquisition is a complex phenomenon. Monolingual children usually learn language from parents. But bilingual children may learn languages not only from parents but also from grandparents, playmates, babysitters, childcare, school teachers and TV. Their exposure to languages fluctuate over time and situation/environment. Childhood bilingualism is poorly understood by many and regarded with scepticism by others. 27

28. Language acquisition of bilingual children Compared to monolingual children, bilingual children have less exposure to each of their languages and, therefore, they never master either language fully and never become as proficient as monolingual children. How do we measure language proficiency? How do we determine if bilingual children’s language development is normal? 28

29. Language acquisition of bilingual children Compared to monolingual children, bilingual children have less exposure to each of their languages and, therefore, they never master either language fully and never become as proficient as monolingual children. How do we measure language proficiency? How do we determine if bilingual children’s language development is normal? 29

30. Language acquisition of bilingual children Young bilingual children may know fewer words in one or both of their languages in comparison with monolingual children of the same age. This is understandable because young children have limited cognitive / memory capacities, and bilingual children must store words from two languages, not just one. Also, because bilingual children learn words in each language from different people, they sometimes know certain words in one language but not in the other. 30

31. Language acquisition of bilingual children When adding the vocabulary that bilingual children know in both languages, they generally know the same number of or even more words as their monolingual peers. Even when differences like these occur, they are short term and are likely to disappear by the time the children begin school. Bilingual children's overall proficiency in each language reflects the amount of time they spend in each. 31

32. Will learning two languages confuse children/ Young bilingual children often mix the two languages and cannot keep them separate. Language mixing is taken as evidence that learning two languages confuses children. Mixing: a fusion of two languages with the inability to differentiate one language from the other. Mixing happens most frequently during early phase of language development, before or around age 2;0 (years; months), whereas later on, bilingual children can easily separate the two linguistic systems. 32

33. Will learning two languages confuse children Phonological mixing Kats – Katt (swedish) & Kass (Estonia) [both katt and kass mean ‘cat’ in English] Lexical mixing I want mansana [I want apple] Semantic mixing I lost the bus [lost = missed in Spanish] Syntactic mixing A house red [colour adjectives follow the noun in Spanish] 33

34. Will learning two languages confuse children Children mix because they are confused by learning two languages? or, Because they lack the appropriate items in one language but have them in the other language? Unitary language system hypothesis Vs. Separate language system hypothesis 34

35. Unitary language system hypothesis A 3-stage model for early bilingual development proposed by Volterra & Taeschner, 1978: I. the bilingual child has only one lexical system comprising words from both languages [1.6-2.1] II. development of two distinct lexical systems although the child applies “the same syntactic rules to both languages” [2.5-3.3] III. differentiation of two linguistic systems, lexical as well as syntactic [2.9-311] 35

36. Unitary language system hypothesis Bilingual children first have a single fused linguistic representation. They begin to differentiate their two native languages by age 3;0. Implication: Young bilinguals have language delay relative to monolinguals. Support for this hypothesis: Volterra & Taeschner (1978) Young bilinguals in the one-word stage acquire words mostly in one but not both languages. e.g., if the word ` bird ' is acquired one language, it is not acquired in the other language. This suggests that young bilinguals do not initially differentiate between their two native vocabularies. 36

37. Unitary language system hypothesis Challenges to this hypothesis Bilingual children mix because they lack appropriate lexical items in one language but have them in the other language. Thus, they borrow vocabularies from the other language. Mixing declines as a child comes to recognize adult-imposed standards of behaviour and shows awareness of his own ability to meet them. Slobin (1972, 1973) argues that bilingual children mix because of acquisitional strategies that are independent of language 37

38. Separate language system hypothesis Genesee F. (1989, Journal of Child Language) argued that: “...contrary to most extant interpretations, bilingual children develop differentiated language systems from the beginning and are able to use their developing languages in contextually sensitive ways. A call for more serious attention to the possible role of parental input in the form of mixed utterances is made.” 38

39. Separate language system hypothesis According to Genesee: “The most proficient bilinguals mix the most and in the most sophisticated ways without violating the rules of either language. It is normal for children growing up in these communities to mix their languages extensively because they are simply learning the patterns of communication that are common in their community. It can be difficult and unnatural, if not impossible, to keep the languages completely separate. If most people in the children's wider community use only one language, the children will eventual learn the monolingual patterns.” 39

40. Separate language system hypothesis The language mixing seen in bilingual children is constrained by grammatical rules. Influenced by sociolinguistic factors such as language mixing pattern of parents. Language mixing is not a consequence of confusion but instead demonstrates the bilingual child's distinct representations of the two languages from an early age. 40