二语习得理论课件.ppt

1、2023-2-3精选版课件ppt1/38Theoretical Approaches toSecond Language LearningnDifferences in Learning L1&L2nBehaviorismnInnatismnInformation ProcessingnConnectionismnThe Interactionist Position2023-2-3精选版课件ppt2/38Differences in Learning L1&L2nA child or adult learning a second language is different from a c

2、hild acquiring a first language in terms of both1)learner characteristicsand2)learning conditions2023-2-3精选版课件ppt3/38Differences in Learning L1&L2Learner Characteristics1.Knowledge of another language2.Cognitive maturity3.Metalinguistic awareness4.Knowledge of the world5.Nervousness about speaking20

3、23-2-3精选版课件ppt4/38Differences in Learning L1&L2Learning Conditions6.Freedom to be silent7.Ample time&contact8.Corrective feedback:(form)grammar and pronunciation9.Corrective feedback:(meaning)word choice10.Modified input2023-2-3精选版课件ppt5/38Differences in Learning L1&L2nSummary:SLA(Second Language Ac

4、quisition)theories need to account for language acquisition by learners with a variety of characteristics and learning in a variety of contexts.2023-2-3精选版课件ppt6/38 Theoretical Approaches to Language AcquisitionTheoretical Approaches to Language Acquisition 2023-2-3精选版课件ppt7/38BehaviorismnSkinner:la

5、nguage behavior is the production of correct responses to stimuli through reinforcement.nFour characteristics of behaviorism:1)imitation,2)practice,3)reinforcement,and 4)habit information nLado(1964):CAA person learning an L2 starts off with the habits formed in the L1 and these habits interfere wit

6、h the new ones needed for the L2.2023-2-3精选版课件ppt8/38American Structurism and BehaviorismnDominant theories in linguistics and psychology within the USA throughout the 1940s and 1950s.nIts psychological base is behaviorism and linguistic base is structuralism.nThe goal of CA:to discover the problems

7、 that foreign language students would encounter in the learning process.And to increase the efficiency in L2 teaching and testing.2023-2-3精选版课件ppt9/38Negative TransfernLado proclaimed that most of the difficulties originated from the differences between L1 and L2.He believed that the more different

8、the two languages are,the more difficult learning would be,and by knowing this,we could predict what errors would appear.2023-2-3精选版课件ppt10/38a strong and a weak form of CAnLado and his followers even provided the degree of differences between two languages.There existed a strong and a weak form of

9、Contrastive Analysis(Wardhaugh 1970).The strong form claims that all L2 errors can be predicated by identifying the differences between the target language and the learners L1.The weak form of the hypothesis claims to be diagnostic.(To check where could be erroneous).2023-2-3精选版课件ppt11/38Contrastive

10、 Analysis(CA)nContrastive Analysis was rooted in the practical need to teach a L2 in the most effective way possible.Its psychological base is behaviorism and linguistic base is structuralism.nRobert Lado:advocated the approach of Contrastive Analysis in his first Book,Linguistics Across Culture(195

11、7)2023-2-3精选版课件ppt12/38BehaviorismnBehaviorism was often linked to the Contrastive Analysis Hypothesis(CAH):It predicts that where there are similarities between the L1 and the target language,the learner will acquire target-language structures with ease;where there are differences,the learner will

12、have difficulty.2023-2-3精选版课件ppt13/38More Definition of CA nCA:is an approach to the study of SLA which involve predicting and explaining learner problems based on a comparison of L1 and L2 to determine similarities and differences.n It was heavily influenced by theories which is dominant in linguis

13、tics and psychology within the USA throughout the 1940s and 1950s.2023-2-3精选版课件ppt14/38BehaviorismnCriticisms about the CAH:Though a learners L1 influences the acquisition of an L2,nNot all errors predicted by the CAH are actually made.nMany of the errors which learners make are not predictable on t

14、he basis of the CAH.1.Some errors are similar across learners from a variety of L1 backgrounds.2023-2-3精选版课件ppt15/38BehaviorismnSummary:The L1 influence may not simply be a matter of the transfer of habits,but a more subtle and complex process of identifying points of similarity,weighing the evidenc

15、e in support of some particular feature,and even reflecting about whether a certain feature seems to belong in the structure of the L2.2023-2-3精选版课件ppt16/38InnatismnCompetence vs.Performance nUniversal Grammar(UG)in relation to second language developmentnKrashens“monitor model”2023-2-3精选版课件ppt17/38

16、Innatism:Competence vs.Performance语言能力对语言运用nCompetence语言能力:It refers to the knowledge which underlies our ability to use language.nPerformance语言运用:It refers to the way a person actually uses language in listening,speaking,reading,and writing.Performance is subject to variations due to inattention or

17、 fatigue whereas competence(at least for the mature native speaker)is more stable.2023-2-3精选版课件ppt18/38Innatism:Competence vs.PerformancenSLA(second language acquisition)researchers from the UG perspective are more interested in the language competence(i.e.,knowledge of complex syntax)of advanced le

18、arners rather than in the simple language of early stage learners.Their investigations often involve comparing the judgments of grammaticality（合乎语法性）made by L2 and L1 learners,rather than observations of actual language performance(i.e.,use of language).2023-2-3精选版课件ppt19/38Innatism:Universal Gramma

19、rnHow UG works in L2 development:Two different views-1)The nature and availability of UG in L2 acquisition is no different from that which is hypothesized to guide L1 learners.Adult L2 learners neither need nor benefit from error correction and metalinguistic information(元语言信息).These things change o

20、nly the superficial appearance of language performance and do not affect the underlying competence of the new language.2023-2-3精选版课件ppt20/38Innatism:Universal GrammarnHow UG works in L2 development:Two different views-2)UG may be present and available to L2 learners,but its exact nature has been alt

21、ered by the prior acquisition of the first language.L2 learners need to be given some explicit information about what is not grammatical（不符合语法规则的）in the L2.Otherwise,they may assume that some structures of the L1 have equivalents in the L2 when,in fact,they do not.2023-2-3精选版课件ppt21/38Innatism:Krash

22、ens“monitor model”nThe acquisition-learning hypothesisnThe monitor hypothesisnThe natural order hypothesisnThe input hypothesisnThe affective filter hypothesis2023-2-3精选版课件ppt22/38Innatism:Krashens“monitor model”nThe acquisition-learning hypothesis(1)nAcquisition:we acquire L2 knowledge as we are ex

23、posed to samples of the L2 which we understand with no conscious attention to language form.It is a subconscious and intuitive（凭直觉获知的）process.nLearning:we learn the L2 via a conscious process of study and attention to form and rule learning.2023-2-3精选版课件ppt23/38Innatism:Krashens“monitor model”nThe a

24、cquisition-learning hypothesis(2)nKrashen argues that“acquisition”is a more important process of constructing the system of a language than“learning”because fluency in L2 performance is due to what we have acquired,not what we have learned.1.Learning cannot turn into acquisition.Many learners may“kn

25、ow”rules but fail to apply them.Learners need to do as much acquiring as possible in order to achieve communicative fluency.2023-2-3精选版课件ppt24/38Innatism:Krashens“monitor model”nThe monitor hypothesis(1)nThe acquired system acts to initiate the speakers utterances and is responsible for fluency and

26、intuitive judgments about correctness,whereas the learned system acts only as a monitor,making minor changes and polishing what the acquired system has produced.2023-2-3精选版课件ppt25/38Innatism:Krashens“monitor model”nThe monitor hypothesis(2)nLearners use the monitor only when they are focused more on

27、 being correct than on what they have to say,when they have sufficient time to search their memory for the relevant rules,and when they actually know those rules.nSince knowing the rules only helps the speaker supplement what has been acquired,the focus of language teaching should be on creating con

28、ditions for acquisition rather than learning.2023-2-3精选版课件ppt26/38Innatism:Krashens“monitor model”nThe monitor hypothesis(3)Criticisms:nIt is very difficult to show evidence of“monitor”use.It is impossible to determine what has been produced by the acquired system and what is the result of monitor u

29、se.nKrashens claim that language which is produced quickly and apparently spontaneously must have been acquired rather than learned leaves us with a somewhat circular definition.2023-2-3精选版课件ppt27/38Innatism:Krashens“monitor model”nThe natural order hypothesis(1)nL2 learners acquire the features of

30、the TL in predictable sequences.Contrary to intuition,the rules which are easiest to state(and thus to learn)are not necessarily the first to be acquired.e.g.the rule for adding an s to third person singular verbs in the present tense 2023-2-3精选版课件ppt28/38Innatism:Krashens“monitor model”nThe natural

31、 order hypothesis(2)nThe natural order is independent of the order in which rules have been learned in language classes(based on Krashens studies of grammatical morphemes).nSubsequent research has confirmed that learners pass through sequences or stages in L2 development.2023-2-3精选版课件ppt29/38Innatis

32、m:Krashens“monitor model”nThe input hypothesis(1)The learner acquires language in only one way by exposure to comprehensible input.If the input contains forms and structures just beyond the learners current level of competence in the language(“i+1”),then both comprehension and acquisition will occur

33、.2023-2-3精选版课件ppt30/38Innatism:Krashens“monitor model”nThe input hypothesis(2)The comprehensible input(“i+1”)hypothesis appeals to intuition,but has not been substantiated by empirical studies.e.g.undirected pleasure reading as a source of comprehensible input.2023-2-3精选版课件ppt31/38Innatism:Krashens“

34、monitor model”nThe affective filter hypothesis(1)n“Affect”refers to such things as motives,needs,attitudes,and emotional states.nThe“affective filter”is an imaginary barrier,which prevents learners from acquiring language from the available input.nDepending on the learners state of mind or dispositi

35、on,the filter limits what is noticed and what is acquired.A learner who is stressed,upset,anxious,self-conscious,or unmotivated may“filter out”input,making it unavailable for acquisition.2023-2-3精选版课件ppt32/38Innatism:Krashens“monitor model”nThe affective filter hypothesis(2)nIt appears to have immed

36、iate implications for classroom practice.Teachers should help students to lower the affective filter in language learning.nIt also appeals intuitively to those who have tried unsuccessfully to learn a language in conditions where they felt stressed or uncomfortable.nHowever,it is difficult to be sur

37、e that affective factors cause the differences in language acquisition.2023-2-3精选版课件ppt33/38Innatism:Krashens“monitor model”/“hypothesis/theory”nSummarynKrashens“monitor model”(i.e.,acquisition vs.learning,monitor,natural order,comprehensible input,and affective filter)has been very influential in s

38、upporting communicative language teaching(CLT),which focuses on using language for meaningful interaction and for accomplishing tasks,rather than on learning rules.nMost teachers and researchers see Krashens hypotheses intuitively appealing,but those hypotheses are hard to be tested by empirical evi

39、dence.2023-2-3精选版课件ppt34/38Information processingnCognitive psychologists working in this model see L2 acquisition as the building up of knowledge systems that enables the learner to use the language automatically.nThey do not assume that there is a difference between acquisition and learning.nTwo i

40、mportant models:attention-processing(noticing)model and restructuring Model2023-2-3精选版课件ppt35/38Information processingnAttention-processing(noticing)model:nIt is assumed that there is a limit to the amount of information a human can pay attention to and learn at one time.Gradually,through experience

41、 and practice,learners become able to use certain parts of the language automatically.nAutomatic language performance may originate from intentional or conscious learning;i.e.,noticing(McLaughlin&Schmidt).nEverything we come to know about the language was first“noticed”consciously before we learn it

42、.2023-2-3精选版课件ppt36/38Information processingnRestructuring Model:nSometimes things which we know and use automatically may not be explainable in terms of a gradual build-up of automaticity through practice.nThey seem rather to be based on the interaction of knowledge we already have,or on the acquis

43、ition of new knowledge(without extensive practice)which fits into an existing system and causes it to be restructured.This can lead to a positive or negative outcome.e.g.“I saw”“I seed”or“I sawed”overapplying the general rule.2023-2-3精选版课件ppt37/38ConnectionismnConnectionists argue that what is innat

44、e is simply the ability to learn,not any specifically linguistic structure.nThey attribute greater importance to the role of the environment in language learning,and see the input as the principal source of linguistic knowledge.nEventually,a learner develops stronger mental connections between the e

45、lements s/he has learned,and thus one situational or linguistic element will activate the other(s)in the learners mind.2023-2-3精选版课件ppt38/38ConnectionismnFindings of connectionist Research:nA learning mechanism can not only learn what it hears but can also generalize,even to the point of making over

46、generalization（过分概括）errors.nThese studies have dealt almost exclusively with the acquisition of vocabulary and grammatical morphemes（词素）,that is,aspects of the language which innatists will grant may be acquired largely through memorization and simple generalization.2023-2-3精选版课件ppt39/38The Interact

47、ionist PositionnSLA takes place through conversational interaction(Hatch,Pica,and Long).nLong sees modified interaction as the necessary mechanism for the L2 acquisition.What learners need is not necessarily simplification of the linguistic forms but rather an opportunity to interact with other spea

48、kers.nResearch shows that native speakers consistently modify their speech in sustained conversation with non-native speakers.2023-2-3精选版课件ppt40/38The Interactionist PositionnThe relationship between modified interaction and SLA(Long):1.Interactional modification makes input comprehensible;2.Compreh

49、ensible input promotes acquisition;Therefore,3.Interactional modification promotes acquisition.2023-2-3精选版课件ppt41/38The Interactionist PositionnModified interaction involves linguistic simplifications and conversational modifications.nExamples of conversational modifications:elaboration,slower speec

50、h rate,gesture,additional contextual cues,comprehension checks,clarification requests,and self-repetition or paraphrase.nResearch has demonstrated that conversational adjustments can aid comprehension in the L2.2023-2-3精选版课件ppt42/38The Interactionist PositionnVygotskys sociocultural theorynLanguage