1. Language Development Language seems to be a uniquely human ability, suggesting an evolutionary foundation Arguments against a purely genetic explanation Productivity of novel phrases and statements Variety of languages and grammatical structures

2. Language Development

3. Auditory Processes Before infants can learn language or even perceive speech sounds, they need to be able to discriminate generally sounds of different frequencies

4. Auditory Processes Like with vision Newborns hear sounds better at low frequencies By 6 months, higher frequency sensitivity is as good as adults Overall sensitivity increases until 10 years, but higher frequency sensitivity does not improve after 4 or 5 years

5. Preverbal Infancy Language acquisition works through the perception of speech and its sounds Must learn to parse the stream of sound into phonemes, syllables, words, and phrases. Phoneme - is the smallest unit of sound that when changed, changes meaning

6. Categorical Perception Infants can discriminate when two sounds are the same or different phonemic category Phonemes are distinguished by their “voice-onset time” between lip opening and voicing by vocal cords

7. Categorical Perception Eimas, Siqueland, Jusczyk & Vigorito (1971) - 1- and 4-mo-olds perception of the distinction between /b/ and /p/ Adults - VOT of less than 25 msec, perceive /b/

8. Categorical Perception Eimas, Siqueland, Jusczyk & Vigorito (1971) - familiarized infants to 20 msec VOT (/b/) and tested them with either 40 msec (/p/), 20, or 0 (/b/)

9. Categorical Perception Eimas, Siqueland, Jusczyk & Vigorito (1971) - familiarized infants to 20 msec VOT (/b/) and tested them with either 40 msec (/p/), 20, or 0 (/b/)

10. Categorical Perception Eimas, Siqueland, Jusczyk & Vigorito (1971) - familiarized infants to 20 msec VOT (/b/) and tested them with either 40 msec (/p/), 20, or 0 (/b/)

11. Phonemic Discrimination In the Japanese language, adults have trouble pronouncing and even discriminating between /r/ and /l/ They are not used in their language Young Japanese infants can discriminate between these sounds At some point they lose this ability (6- 12 mos.)

12. Discriminating 2 Hindi syllables

13. Early Sounds 2 months - Cooing One syllable sounds, like ‘ah’ and ‘oo’ Associated with positive emotions 6 months - Babbling Strings several instances of same sound together, like ‘bababa’ This babbling is similar across different cultures and languages

14. Early Sounds End of First Year Stop duplicating and begin to string different sounds together Include changing intonation and pitch These sounds and strings are very similar to their first words Even deaf infants display babbling Suggesting a biological mechanism But, they are delayed in babbling and production of proper syllables

15. Nonverbal Language Gestures first seem to be use around 8-10 months Used to indicate requests, for example, wanting a toy Might be related to physical development Around 11-12 months, gesture start to be used for referential communication To indicate items or events in environment Example, holding up a toy to show it

16. Nonverbal Language End of first year, get combination of gestures and vocalizations Then, gestures start to fall out and get transition to their first words.

17. First Words When they first appear shows considerable variability, from 9 months to 16 months First words are typically of items that are familiar and important in their day-to-day lives Bates (1979) and Barrett et al. (1986) ‘no’ when rejecting an object ‘bye’ when putting down a telephone ‘papa’ when the doorbell rings

18. Lexical Development Once child begins to talk, its vocabulary and usage expands dramatically and quickly Acquiring words is easier than attributing them with the right meaning

19. Lexical Development By 18 months, infant typically has on average 50 words it can produce and 100 words it can understand

20. Lexical Development Answering Questions What’s That? Who’s That? Asking Questions What? (what is that) Where? Comments Gone (empty cup) Hot (pot on stove) Cut (band-aid on daddy)

21. Lexical Development Errors in first words usage Overextensions Using “Daddy” for every male More common in production than comprehension Underextensions Using “Duck” for a toy duck but not a real one

22. First Word Combinations Occurs around age 2 Tend to leave out fillers “Mommy apron” Types of combination seem to be common across languages Even as sentences grow to three and four words, they can be characterized as telegraphic speech They leave out fillers (a, the, and)

23. Grammar Development To change a verb to past tense, we add “ed” Children overregularize Add “ed” to words where it is not required For example, “lose” becomes “losed” instead “lost” This also happens for adding “s” for plural Infant learn the grammar rules and they apply them religiously and have to learn the exceptions

24. What are Bilinguals Individuals who have knowledge and use of more than one language How much do you need to know? Have native-like control of two languages Limits the number of bilinguals Fluent in one language and can produce meaningful statements in the other

25. What are Bilinguals Daily bilinguals vs. dormant bilinguals Balanced vs. Dominant bilinguals Compound bilinguals two linguistic codes stored in one meaning unit Coordinate bilinguals each code stored in separate meaning units Subordinate bilinguals code for L2 is interpreted through L1

26. What are Bilinguals Additive bilinguals Can enhance L2 proficiency without losing L1 proficiency Both languages valued by society Subtractive bilinguals L2 acquired at expense of L1 proficiency Simultaneous bilinguals are more likely to be balanced

27. What are Bilinguals Distinctions fall along continuum, such as proficiency

28. Proficiency Linguistic competence knowledge of language rules Performance competence use of language in the appropriate social context

29. Proficiency Does proficiency refer to knowledge or usage? Is knowledge limited to grammar or does it include pragmatics and socio-cultural aspects? How is motivation and emotions related?

30. Proficiency Two factors to determine whether balanced or dominant proficiency in each language comparison of proficiencies across languages Problems: What is the norm for a native speaker? variations in vocabulary and knowledge Can monolinguals and bilinguals be compared on same scale? Are assessments of proficiency for one language valid for another?

31. Age - Acquisition Are children more efficient L2 learners? Does one need to start learning L2 before a certain age? Need to consider route of acquisition rate of acquisition attainment of L2 proficiency

32. Age - Acquisition Route of acquisition adult L2 learners acquire grammar in similar order as children L2 learners Rate of acquisition when control for exposure amount to L2, adults outperform children however, with 3 month exposure, teenagers (12-15) > adult (>15) > children (3-10) after 10 month exposure, children = adult

33. Age - Acquisition Age of attainment of L2 proficiency some evidence of critical period for L1 among deprived and deaf children decline in L2 performance in older acquirers due to biological/neurological factors? is it possible for older to acquire native proficiency?

34. Age - Acquisition Age of attainment of L2 proficiency disagreement over closure age evidence for critical period from negative correlation between age arriving in country and performance decline has been shown to start at 5 and close at 15

35. Age - Acquisition Age of attainment of L2 proficiency other factors besides age including intensive instruction, high motivation, and lots of L2 exposure further, aptitude may play a role finally, others have suggested there is no closure and that the decline is continuous instead, interactions between L1 and L2 constrain L2 accuracy