what we know about second language acquisition : a synthesis from four perspectives
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Review of Educational
http://rer.sagepub.com/content/82/1/5The online version of this article can be found at:
DOI: 10.3102/0034654311433587
February 20122012 82: 5 originally published online 1REVIEW OF EDUCATIONAL RESEARCH
Burgess-Brigham, Melike Unal Gezer and Catherine SnowL. Quentin Dixon, Jing Zhao, Jee-Young Shin, Shuang Wu, Jung-Hsuan Su, Renata
Four PerspectivesWhat We Know About Second Language Acquisition : A Synthesis From
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Review of Educational Research
March 2012, Vol. 82, No. 1, pp. 560
DOI: 10.3102/0034654311433587
2012 AERA. http://rer.aera.net
5
What We Know About Second LanguageAcquisition: A Synthesis From Four Perspectives
L. Quentin DixonTexas A&M University
Jing ZhoSun Yat-sen University
Jee-Young ShinShung Wu
Jung-Hsun SuRent Burgess-Brighm
Melike Unl GezerTexas A&M University
Ctherine SnowHarvard University
Educational policies that impact second language (L2) learnersa rapidly-
growing groupare often enacted without consulting relevant research. Thisreview synthesized research regarding optimal conditions for L2 acquisition,facilitative L2 learner and teacher characteristics, and speed of L2 acquisi-tion, from four bodies of workforeign language education, child languageresearch, sociocultural studies, and psycholinguisticsoften overlooked byeducators. Seventy-one peer-reviewed journal articles studying PK-12 L2learners met inclusion criteria. Findings included: 1) Optimal conditions
for L2 learners immersed in a majority-L2 society include strong home lit-eracy practices, opportunities to use the L2 informally, well-implemented
specially-designed L2 educational programs, and sufficient time devoted toL2 literacy instruction, whereas L2 learners with little L2 exposure require
explicit instruction to master grammar; 2) L2 learners with strong L2 apti-tude, motivation, and first language (L1) skills are more successful; 3)Effective L2 teachers demonstrate sufficient L2 proficiency, strong instruc-tional skills, and proficiency in their students' L1; 4) L2 learners require 3-7
RER433587RER10.3102/0034654311433587Dixon et al.Second Language Acquisition
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years to reach L2 proficiency, with younger learners typically taking longerbut more likely to achieve close-to-native results. These findings, even thosemost relevant to education, are not reflected in current US policy. Additionalresearch is needed on the characteristics of successful or unsuccessful L2
learners and L2 teachers. Such research should attend systematically to thedifferences between L2 learning in maximal versus minimal input settings;whereas the psycholinguistic challenges of L2 learning might be commonacross settings, the sociocultural and interactional challenges and opportu-nities differ in ways that can massively impact outcomes.
Keywords: second language acquisition, foreign language education, sociocul-tural, psycholinguistic, English language learners.
Second and foreign language education are topics attracting increasing interestacross the globe. In the United States, the number of children entering school who
speak a language other than English at home is increasing much more rapidly thanthe overall school-aged population (Office of English Language Acquisition,Language Enhancement and Academic Achievement for Limited English ProficientStudents, 2010). Educators are challenged to help these children reach the level ofproficiency required for learning sophisticated academic content through English.Around the globe, the popularity of learning English as a foreign language hasexploded, making second language (L2) education a mainstream endeavor (Hu,2007).
Nonetheless, immigrant students continue to lag behind native speakers in aca-demic achievement in the United States (National Assessment of EducationalProgress, 2009), and foreign language education in the United States and else-where in the world is far from universally successful (Byun et al., 2011; Chen &Goh, 2011; Robinson, Rivers, & Brecht, 2006). We argue in this review that prog-ress in meeting the educational challenges of L2 learning and teaching has beenhampered by the failure to integrate information from across the several fields ofresearch that are relevant to the topic. We identify four of those fields, briefly sum-marize their contributions to thinking about L2 learning, and then show how theycomplement one another in responding to some important questions of researchand practice, while still leaving others unresolved.
We approach this review by highlighting the contributions from the four groupswho have contributed to research on issues of L2 learning and teaching: foreignlanguage educators, child language researchers, sociocultural researchers, andpsycholinguists. Research from the foreign language educator perspective took offin the decades after World War II, with the founding of the journal LanguageLearning in 1948, of the Center for Applied Linguistics in 1959, and of theInternational Applied Linguistics Association in 1964. Starting in about 1970,researchers in the new field of child language acquisition started applying theirmethods and thinking to L2 learners. Subsequently sociocultural and psycholin-guistic considerations were brought to bear both on first language (L1) and L2
issues. These four groups remain the primary sources of research related directlyto issues of L2 learning.
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Second Language Acquisition
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These four groups have brought distinct perspectives, with different motivatingquestions, to the field of L2 acquisition (see Table 1). They have worked with dif-ferent default populations acquiring L2s in different contexts. They have alsobrought different methods to their questions and have published in different jour-nals, with the result that they have not communicated effectively across their dis-ciplinary and professional boundaries. Foreign language educators, for example,traditionally focus on L2 acquisition among adolescents or adults in classroomsettings and use correlational or small-scale quasi-experimental methods to iden-tify good students or good teaching techniques. Foreign language educators bringthe most practice-oriented perspective to L2 acquisition but may limit themselvesby thinking of L2 acquisition as an outcome of L2 teaching in a classroom setting,disregarding informal or naturalistic acquisition. Child language researchers, onthe other hand, use descriptive, longitudinal techniques with young L2 learners in
naturalistic settings, often focusing on caregiverchild interactions. Child lan-guage researchers have focused most on what factors influence childrens L1 or L2acquisition. Sociocultural researchers study L2 learners of any age, but they tendto use qualitative methods to understand the social and cultural forces at work inany L2 learning environment. Research from a sociocultural perspective also mayexamine the L2 learners or teachers own point of view and how issues of identityaffect L2 acquisition. Psycholinguists, by contrast, examine the mental processesinvolved in L2 acquisition at any age and typically use quantitative methods tostudy language elicited in laboratory settings, often through controlled experi-ments. They have been very interested in the component skills that build L2 com-
petence and which cognitive skills may be able to transfer from L1 to L2.Researchers from these four perspectives have generally worked at the periph-ery of the issues that are most urgent in U.S. educationsupporting the achieve-ment of L2 learners, bilinguals, and students from language-minority homes inmainstream classrooms. Even the work of foreign language educators, though ofcourse centrally focused on educational issues, has not been exploited for optimalrelevance to L2 learners or to students with academic challenges associated withtheir language-minority status. The other three groups have often asked questionswith implications for education, but not those that address teachers immediateinstructional concerns. Even when they examined L2 acquisition in classroom
contexts, these researchers often did not focus on the curriculum and instructionissues that specifically inform educational practice. Nonetheless, these perspec-tives have contributed much to understanding L2 acquisition; we include themprecisely because they may be less well known to educators than are the findingsof researchers directly evaluating educational programs.
Of course, other bodies of work have contributed to our understanding of L2acquisition as well, notably theoretical linguistics. Linguists are primarily inter-ested in the properties of languages themselves, how languages are similar anddifferent, and how the complexity of linguistic systems should best be represented.Much work in child language was originally motivated by a search for evidence to
support or refute hypotheses on the nature of language, but sociolinguists andpsycholinguists focus more on communicative effectiveness and real-time perfor-mance than on the nature of language itself. The recurrent observation that L2acquisition is, generally, more effortful and less successful than L1 acquisition
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8
TaBLe
1
Differencesamo
ngtheperspectives
Perspective
Unitofanalysis
Context
Ageoflearners
Lang
uagedomain
focusedon
Majorques
tions
Foreignlanguag
e(FL)
educators
Studentachievem
ent
orproficiency
FLclassroomwith
littleFLexposurein
community
Adolescentsand
adults
Accen
t,grammatical
correctness,reading
ability
Developing
and
improving
teach-
ingmetho
dsand
techniques
Childlanguage
Child
Naturalistic,extended
toteacherorstudent
inclassrooms
Youngchildren
Grammar,lexicon,
exte
ndeddiscourse
(narratives,academic
lang
uage)
Identifyingfactorsthat
influencechildL1
development,bilin-
gualL1acquisition,
childL2a
cquisition
Sociocultural
Studentand
interlocutors
Naturalisticorclass-
room
Any
Comm
unicative
effe
ctiveness,
pragmatics
Understandingsocial
andcultur
aldiffer-
ences,impactof
identity,interper-
sonalinteractions
Psycholinguistic
Cognitiveandbrain
processes
Laboratory,extended
toclassrooms,natu-
ralistic
Any
Grammar,lexicon,
text
structures
Understandingprocess
ofL2acquisition,
transferofL1skills
toL2
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Second Language Acquisition
9
does not interest linguists but remains a puzzle for the four groups of researcherswhose work we highlight in this review.
What exactly do we mean when we use the termL2 acquisition? L2 acquisitionincludes second (or foreign) language learning in both naturalistic (unschooled)settings as well as classroom-based learning, including both oral and writtenforms. For the purposes of this article, we define the term broadly to describe thelearning of a second (or subsequent) language by anyone who has basic commandof one (or more) language(s) already. We use the termL2 education to refer spe-cifically to classroom-based instruction or educational programs designed to aidstudents in mastering an L2, in either oral or written form (or both). Within L2education, there are two main contexts that need to be distinguished: a foreignlanguage context and an L2-majority context (referred to by many as a secondlanguage context). Children learning an L2 in a foreign language context have
little exposure to the L2 outside of the classroom. By contrast, children learning anL2 in an L2-majority context are typically surrounded by the L2 within the broadersociety in which they live. This article does not discuss the situation of childrenexposed to two languages from birth, which has been termed bilingual first lan-guage acquisition (De Houwer, 2009), although some of the research perspectiveshave examined bilingual L1 acquisition to better understand how learning an L2after an L1 is established (sequential bilingualism) differs from simultaneous bilin-gualism.
We reviewed the research to address five questions of particular relevance toeducators (see Snow, 1993, 1998, for earlier responses to the first two of these):
1. What are optimal conditions for L2 acquisition?2. What are the characteristics of excellent or unsuccessful L2 learners?3. What are the characteristics of excellent or unsuccessful L2 teachers?4. What are reasonable expectations for speed and accomplishment for L2
learners of different ages?5. Has information generated by the four research perspectives influenced the
formulation of educational policies for L2 learners?
These five questions have been chosen because of their centrality to the fourperspectives and their relevance to L2 education. Question 1 (Q1) illuminates thehome, community, school, and classroom factors that educators need to considerto adjust their schools, programs, and classrooms to better serve their L2 learners.Although studies addressing Q1 come from all four perspectives, socioculturalresearchers may be said to be most concerned with this question. Socioculturalresearchers argue that context is an extremely important and understudied aspectof L2 acquisition. Even though educators may not always be able to set up com-pletely optimal conditions, knowing what to work toward, and improving thoseconditions over which they have control, can help educators improve their L2
students achievement.Question 2 (Q2) and Question 3 (Q3) have been central to foreign languageeducators. Regarding Q2, foreign language educators have typically identified stu-dents who are likely to succeed in L2 classrooms and have in some cases limitedaccess to L2 (or L3) education to those with demonstrated ability. Current educators
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with L2 students in either foreign language or L2-majority contexts may want touse information on student characteristics to identify students who need extra sup-port or instruction in learning an L2. Regarding teachers, Q3 helps school admin-istrators and district officials distinguish teachers who may be better suited to workwith L2 learners as well as discover what traits or attributes to work toward foster-ing in teachers. When these attributes are identified, preservice and in-servicetraining for teachers can include activities that build these traits. Identifying thesecharacteristics could lead to the development of a screening tool that could excludeteacher education candidates who did not possess important traits that are not train-able; in this way, new teachers could be chosen who will have the best chance ofsuccess of working with L2 learners.
Of most interest to child language researchers and psycholinguists, Question 4(Q4) is perhaps the most urgent: What can educators reasonably expect from L2
learners in different contexts? Answering this question is critical to aiding theformulation of research-based L2 education policies, such as deciding how longL2 education services should be provided for children learning L2 in L2-majoritycontexts. Q4 is also relevant to foreign language educators, in identifying howmany hours of L2 instruction is necessary for students to reach desired bench-marks. In addition, Q4 results can help teachers to set rigorous but attainable aca-demic goals for L2 learners. Question 5 (Q5) ties the other questions together byasking whether current U.S. policy reflects these research findings. If relevantresearch findings have not previously influenced policy, then we need mechanismsto move the policy conversation beyond a single-minded search for the best L2
program to an understanding of why certain approaches might work better withsome students or in some contexts than others.This article is not meant to be a comprehensive review of all studies related to
L2 acquisition; rather, our goal is to demonstrate the value of integrating informa-tion from diverse perspectives in thinking about educational questions. Our reviewthus differs from books such as Ortega (2009) and Mitchell and Myles (2004) byincorporating insights from four distinct bodies of work that are not typicallybrought into relation with one another, and by bringing these bodies of work spe-cifically to an audience of educators and educational researchers. In addition, wereview studies from all four perspectives published up through 2011.
We first describe the methods used for this review, followed by brief overviewsof each of the four perspectives to familiarize the reader with each perspectivesgeneral approach to studying L2 acquisition. In the subsequent findings section,evidence from all four perspectives is synthesized to provide answers to our fiveresearch questions.
Method
Searches for peer-reviewed articles were conducted in Academic Search Complete,Education Full Text (Wilson), ERIC (EBSCO or CSA), Linguistics and LanguageBehavior Abstracts (CSA), PsycINFO (CSA), Social Sciences Full Text (Wilson), and
Sociological Abstracts (CSA). Because a previous review from these perspectives waspublished in 1998, we limited our search to 1997 to 2011. We used terms relating to L2acquisition, such as second language acquisition,ESL,L2,foreign language,foreignlanguage education, andELL education, combined with terms specific to our five
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questions, such as optimal conditions, classroom factors, learner characteristics,teacher traits, time, age, educational outcomes, educational policy, and instructionalprograms. To capture references that described each approach, we also searched theabove L2 terms in combination with general terms relating to our four perspectives,such as child language, sociocultural, andpsycholinguistic. We also used the followingliterature reviews on related topics to locate empirical studies that met our inclusioncriteria: August and Shanahan (2006), Bialystok (1997), Birdsong (2006), Genesee,Lindholm-Leary, Saunders, and Christian (2006), Goldenberg and Coleman (2010),Hammer, Jia, and Uchikoshi (2011), Hyltenstam and Abrahamsson (2000), Liddicoat(2006), Lightbown (2000), Long (2005), Marinova-Todd, Marshall, and Snow (2000),Masgoret and Gardner (2003), Menken (2009), Muoz (2008a, 2008b), Muoz andSingleton (2011), Nikolov and Mihaljevic Djigunovic (2006), Rothman (2008),Saunders and Goldenberg (2010), Scovel (2000), Singleton (2005), Slabakova (2006),
Snow and Kang (2006), Stevens (2006), and Ushioda (2010). Because the listedreviews frequently included studies from a general educational psychology perspec-tive, we refer the reader to them for an additional perspective regarding our questions.In addition, we consulted recent texts by leaders in the fields and handbooks related tothe perspectives and L2 acquisition as additional sources for defining the perspectives,identifying contributions of each perspective to L2 acquisition, and formulating currentissues within each perspective; we have cited these sources when used, with full refer-ences in the reference list.
These initial searches provided tens of thousands of references, so we reducedthe reference lists by general relevance (according to title). Our inclusion criteria
required that the empirical studies (a) were empirical, (b) were published in peer-reviewed journals, (c) were published between 1997 and 2011, (d) included par-ticipants in grades prekindergarten to 12 (ages 418), (e) addressed at least one ofour five questions, (f) included some measure of L2 proficiency or academicachievement as an outcome, and (g) were conducted from one of the four perspec-tives. As an exception to the first criterion, we retained theoretical or conceptualpieces from our search that described one of our four perspectives as well as arti-cles that described U.S. federal, state, and local educational policy. To determinethe perspective or research tradition from which an empirical study was conducted,we examined methods, participants, setting, theoretical framework, and the orien-
tation of the prior research cited in the study. At this first phase of screening, weexcluded studies that obviously did not address our research questions, such asstudies of assessment, world Englishes, and dialect features. We then combined thearticles from all the searches and removed duplicate references.
After obtaining a pool of 4,457 potentially relevant studies, we examinedabstracts to exclude articles that failed to meet our inclusion criteria. Thisresulted in a reduced pool of 1,541. Many excluded studies described specificlinguistic features in relation to universal grammar, examined code switching,involved university students as participants, measured only socioemotional out-comes, or focused on teaching L2 learners in the content areas (e.g., math, social
science), in which the specific academic content, rather than L2 proficiency, wasthe goal of instruction. At this point, we obtained the articles and looked moreclosely at design, sampling, and methods to screen for quality and confirmed thatthey met our inclusion criteria. We eliminated studies that were identified at this
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stage as using a convenience sample or arbitrary sampling (e.g., first 20 torespond) or that did not state how the sample was obtained. Among studies usingquantitative data analysis methods exclusively, we eliminated those with samplesizes of fewer than 30, because these smaller studies do not have the statisticalpower to detect effects except for large correlations, which will also be evidentin larger studies (Light, Singer, & Willett, 1990). As we read through the studies,we applied the principles outlined in Scientific Research in Education (NationalResearch Council, 2002) to further assess their quality. We thus obtained a finalpool of 71 empirical studies addressing one of our five questions (see Table 2)and 8 articles describing U.S. policy for Q5. We also identified 63 theoretical,conceptual, or empirical articles for background or current trends relating to oneof the four perspectives, 18 of which we ultimately used. We noted a few studiesthat were repeatedly cited in articles obtained through our search and that seemed
relevant to our questions. We obtained copies of those articles and included the3 that met our other criteria.Studies that met our criteria were apportioned to an author according to which
question they addressed. Studies that addressed more than one of our questionswere considered separately for each question. Studies were coded for perspective,methods, and setting by at least two authors. Key findings and relevance to ourquestion were also noted. The studies pertinent to each question were consideredas a group, and key findings were organized around themes that emerged from thestudies. The original articles were consulted as necessary to further contextualizefindings and look for possible causes of discrepant findings.
Foreign Language Educators Perspective
For centuries, the interest of foreign language educators has basically remained thesame: to enhance effectiveness in L2 education by selecting and testing optimalpedagogical methods and techniques. Theoretically allied with applied linguistics,foreign language educators tend to study L2 learning of mostly adolescent andadult learners in classroom settings.
Among the many models foreign language educators have proposed to under-stand student differences in L2 attainment (Lightbown & Spada, 2006), two mod-els, widely tested in studies that derive from the foreign language educators
perspective, have particular relevance to our questions: the inputinteractionout-put (IIO) model and the socioeducational model. In the IIO model, inputthroughspeech or printprovides the data from which L2 learners must discern the rules(Alcon, 1998). L2 learners then try out their understanding of the rules throughspeech or writingoutput. Interaction then offers learners essential feedback onwhether the learners output was understandable (Gass & Mackey, 2007). Thesocioeducational model proposed by Gardner (1985, 2000), by contrast, focuseson learners integrativeness, attitudes towards the learning situation, and motiva-tion (Masgoret & Gardner, 2003, p. 126). Integrativeness is defined as L2 learn-ers psychological adaptability to another cultural and linguistic community. The
excitement or anxiety L2 learners may feel in an L2 context compose their atti-tudes, and motivation is the observable behavior driven by goals and desires(Masgoret & Gardner, 2003). Though Gardners model has been challenged andmodified by other researchers (Drnyei, 1994, 2000, 2003; Noels, 2001; Woodrow,
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13TaBLe2
Summaryofempir
icalstudiesincludedinthereview
Authors
Participants
Context
Purpose
Keyfindings
PSP
AkbariandAllvar
(2010)
30EFLTs,age2348
Secondaryschoolsin
Iran
To
investigate3
T
-relatedvariables
a
ndrelatethemto
s
tudentacademic
a
chievement
Tsreflectivity,senseof
efficacy,andteaching
stylep
ositivelycor-
relatedwithstudent
L2performance
F
Andrews(1999)
3L1ChineseEFLTs
EFLclassesinsecond-
aryschoolsinHong
Kong
To
explorehow
m
etalinguistic
a
warenessaffects
c
lassroominput
Metalinguisticaware-
nessa
idsTin
provid
ingappropriate
instructionalinputfor
L2lea
rners
F
Celaya,Torras,and
Prez-Vidal(20
01)
479L1Spanish-
Catalan,L
2English
startedat8vs.1
1
EFLclassesinSpain
To
testtheeffectsof
a
geonL2learners
w
rittenproduction
Withmo
rehoursof
instruction,later
learne
rsshowedbetter
complexity,f
luency,
andac
curacyofL2
writing
F
Cenoz(2002)
60elementaryand
secondarySs,6year
s
ofL2instruction
EFLclassesinSpain
To
examinetheinflu-
e
nceofageofonset
o
nEFLproficiency
Earlygroupperformed
better
onpronuncia-
tion
F
Lategr
oupperformed
betteronoverall
oralproficiencyand
gram
mar
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14
Authors
Participants
Context
Purpose
Keyfindings
PSP
CollinsandW
hite
(2011)
230L1French6th
graders,over5
10
months
EFLclassesinQue-
bec,Canada
Todeterminetheef-
fectoftheintensity
ofEFLinstruction
onL2speaking,
listening,reading,
writing
Noadvantagefor
sa
menumberof
hoursofinstruction
condensedinto5
m
onthsorspread
over10months
F
CsizrandDrnyei
(2005)
8,593L1Hungarian
Ss,ages13and14
EFLandGFLclasses
inHungary
TodescribeL2learn-
ersmotivational
profiles
Integrativemotiva-
tioninfluencedL2
le
arnersintended
le
arningeffortand
L2preference
F
DoizandLas
agabas-
ter(2004)
38L1Spanish-
BasqueSs,L2
Englishstartedat8
vs.1
1
EFLclassesinSpain
Toexaminetheeffect
ageonEFLSs
writtenproduction
Positiveeffectof
le
ngthofexposure
onoverallwriting
proficiency
F
Earlystartersper-
fo
rmedbetteron
fluency,notaccu-
ra
cyorcomplexity
DrnyeiandCsizr
(2005)
8,593L1Hungarian
Ss,ages13and14
EFLandGFLclasses
inHungary
Tofindouthowinter-
culturalcontactis
relatedtointereth-
nicandlanguage
attitudesandL2
motivation
Acurvilinearcontact
attituderelationship
w
ithhighercontact
m
eaningbetterat-
titudesbuthighest
contactassociated
w
ithworstattitudes
andmotivation
F
TAbLE
2(co
ntinued)
(continued)
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Authors
Participants
Context
Purpose
Keyfindings
PSP
Erlam(2003)
70Ss,EL1andvari-
ousL1,ageabout
14
FFLclassesinNew
Zealand
TocompareL2listen-
ing,speaking,and
readingamong
threeinstructional
strategies
Output-basedand
structuredinput
moreeffectivethan
regularcommunica-
tiveL2instruction
F
Mihaljevi
Djigunovi
,Niko-
lov,andOtt(2008)
717L1Croatianand
L1HungarianSs,
age14
EFLclassesinCroatia
andHungary
TocompareCroatian
andHungarianEFL
SsL2performance
CroatianSshigherL2
pr
oficiency
F
Non
significantimpact
of
startingage,fre-
qu
encyofclasses,
an
dgroupsizeon
L2attainment
Navs,Torras,and
Celaya(2003)
520L1Catalan-Sp
an-
ish1st6thgraders,
L2startage8vs
.11
EFLclassesinSpain
Toanalyzehowage
ofonsetandageat
testinginfluenced
writingafter200,
416,and726hours
ofFLinstruction
Late
learnersper-
fo
rmedsignificantly
be
tteronaccuracy,
fluency,lexical
co
mplexity,and
mostofmeasuresof
sy
ntacticcomplex-
ityinL2writing
F
PufahlandRhodes
(2011)
3,670K12elemen-
taryandseconda
ry
schools
EL1schoolsinUS
Toexaminehowwell
theschoolscan
prepareSstocom-
municateinLOTE
FLc
ourseofferings
de
creasedoverpast
10
years
F
TAbLE
2(co
ntinued)
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Authors
Participants
Context
Purpose
Keyfindings
PSP
Robinson,Rivers,and
Brecht(2006)
1,398adults,L
OT
E
startedindifferent
settings
LOTE(FLorL1)in
US
Toinvestigatewhat
factorspredict
speakingalanguage
otherthanEnglish,
aswellastheprofi-
ciencylevel
Hom
elanguagelearn-
in
gbestpredictorof
speakingaLOTE
verywell
F
FLlearningmostly
unsuccessful
Seek(2007)
62EFLTs;93EFLT
candidates
SchoolsinSlovenia
Toexplorethelan-
guageneedsofTs
inSlovenia
Tsn
eedsufficientL2
proficiencytofunc-
tioninavarietyof
settings
F
Tsn
eedgrammatical,
phonological,lexi-
cal/sociolinguistic
training
SollarsandP
umfrey
(1999)
156children,mean
age5
EFLclassesinMalta
Tocomparethe
effectsoftwo
teachingmodelson
youngL2learners
Olderchildrenbetter
L2oralandreading
performance
F
Rec
iprocalmodelof
te
achingandlearn-
in
geffective
White,Muo
z,and
Collins(20
07)
150L1Frenchor
Catalan-Spanish
8th
graders
EFLclassesinQue-
bec,Canadaand
Spain
Toevaluatetheeffect
ofform-focused
instructionon
theacquisitionof
Englishpossessive
determiners
Exp
licitinstruction
anddirectcontras-
tiveanalysesin
limitedL2exposure
contextseffective
F
TAbLE
2(co
ntinued)
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Authors
Participants
Context
Purpose
Keyfindings
PSP
Wode(1999)
75L1German7th
graders
EFLclassesinGer-
many
Tofindoutwhether
incidentallearn-
ingoccursinFL
orcontent-FL
classrooms
Ssincontent-based
FLclassesbetter
in
cidentalL2vo-
cabularylearning
F
Bongaerts,vanSum-
meren,P
lanken,
andSchils
(1997)
44L1Dutchadults,
L2startedafter12;
15EL1s
EFLintheNether-
lands
Toexaminewhether
thelatelearn-
erscouldattaina
native-likeperfor-
manceintheL2
pronunciation
Som
elatestarters
showednative-like
L2pronunciation
F,P
BarnandCelaya
(2010)
144L1Catalan-Span-
ishSs,L2starte
dat
8vs.1
1
EFLclassesinSpain
Toexaminepragmatic
fluencyofL2learn-
ersofdifferentages
with7yearsofL2
instruction
Pragmaticproficiency
in
creasedwithL2
proficiency
F,P
Sparks,Patto
n,
Ganschow,and
Humbach(2009)
54EL1highschool
Ss,2yearsL2
learning
FFL,G
FL,S
FL
classesinUS
Tofindoutstrong
precursorsoforal
andwrittensecond
languageprofi-
ciency
Significantcorrela-
tionbetweenL1
aptitudeandL2
proficiency
F,P
L2aptitudestrongest
predictorofL2
proficiency
TAbLE
2(co
ntinued)
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Authors
Participants
Context
Purpose
Keyfindings
PSP
GonzalezandUhing
(2008)
48L1SpanishL2
Englishchildren
,
meanage4.3
Familyliteracypro-
graminUS
Toexaminewhat
homefactors
influencechildrens
oralL1andL2
proficiency
Libraryuseimportant
fororalL2
C
Inte
ractionwith
extendedfamilyim-
portantfororalL1
Hammer,Davison,
Lawrence,
andMic-
cio(2009)
72L1Spanishchi
l-
dren,meanage4.1
EL1preschoolclasses
inUS
Toexaminetheinflu-
enceofmaternal
languageuseon
childsL1andL2
vocabulary
Increasedmothers
useofEnglishno
effectonL2Eng-
lish,negativeeffect
onL1Spanish
vocabulary
C
Hammer,Lawrence,
andMiccio(2008)
83L1SpanishL2
Englishchildren
,
meanage3.9
EL1preschoolclasses
inUS
Toexaminethe
vocabularyand
comprehension
developmentofbi-
lingualpreschoolers
overtwoyears
Spa
nishonlyathome
lo
werEnglishat
startandend,faster
growth
C
Spa
nishandEnglish
athome,higher
E
nglishatstartand
end
TAbLE
2(co
ntinued)
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Authors
Participants
Context
Purpose
Keyfindings
PSP
Hammer,Miccio,and
Wagstaff(2003)
43SpanishEnglish
bilingualchildren,
meanage3.8
EL1preschoolclasses
intheUS
Toexaminetheinflu-
enceofhomeliter-
acyenvironmenton
childrensemergent
literacyskillsover
twoyears
Pressforachievement
andfrequencyof
m
otherchildbook
re
adingpositively
correlatedwithchil-
drensL2literacy
C
MacSwanan
dPray
(2005)
89L1SpanishL2
EnglishSs,grad
es
K3
Bilingualclassesin
US
Toevaluatethe
bilingualprogram
andtesteffectsof
ageonlanguage
attainment
Weakevidencefor
youngchildrens
advantageinlearn-
in
grate
C
Variabilityinratefor
ESLchildrento
achieveparitywith
nativespeakers
Pez,Tabors,and
Lpez(2007)
319L1SpanishL2
Englishbilinguals;
144L1Spanish
controls,age4.4
preschoolclassesin
USandPuertoRico
Toexaminethedif-
ferencebetween
Spanishbilingual
andmonolingual
childrensearly
literacyskills
Stro
ngerlanguage
skillsinEnglish
th
anSpanish,
exceptphonologi-
calawareness,in
bilingualchildren
C
Reese,Garnier,Galli-
more,andGolden-
berg(2000
)
66L1SpanishL2
Englishchildren
,
gradesK7;ove
r8
years
EL1kindergarten
classroomsinUS
Toinvestigatehome
andeco-cultural
factorsthatinflu-
enceL1Spanish
SslaterL2reading
achievement
EarlySpanishliteracy
andoralEnglish
predictedlater
Englishreading
C
TAbLE
2(co
ntinued)
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Authors
Participants
Context
Purpose
Keyfindings
PSP
ParentsyearsinUS
predictedchilds
oralEnglish
proficiencyatK
Roberts(200
8)
33L1Hmongand
L1
Spanish,L
2English
children,meanage
4.34
EL1preschoolclasses
inUS
Toexaminetheeffect
ofreadinginL1
andL2athomeon
L2vocabulary
Com
biningclassroom
L2instructionand
L1bookreadingat
homecontributed
positivelytoL2
vocabularylearning
C
Tagoilelagi-L
eota,
McNaughton,Mac-
Donald,an
dFarry
(2005)
23L1Samoanand26
L1Tonganchild
ren,
meanage5
EL1classroomsin
NewZealand
Toexaminethebilin-
gualandbiliteracy
developmentof
ESLchildrenover
1.6years
Increasingcontrol
overEnglish,w
hile
decreasingcontrol
overL1
C
Weakeningrelation-
shipbetweenlit-
eracyinL1andL2
Winsler,D
az,Espi-
nosa,andR
odr-
guez(1999
)
46L1SpanishL2
Englishchildren
,
ages34
Bilingualpreschools
inUS
Toexaminethe
concurrentandlon-
gitudinaleffectsof
attendingbilingual
preschoolsonlan-
guageproficiency
inbothlanguages
Earlyexposureto
Englishnotrelated
to
L1-Spanishloss
C
TAbLE
2(co
ntinued)
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Authors
Participants
Context
Purpose
Keyfindings
PSP
Childrenwhoat-
te
ndedbilingual
preschoolshowed
greatergainsin
productiveoralL2
skillsovertime
Barnett,Yaro
sz,
Thomas,Jung,and
Blanco(20
07)
About131L1Spa
nish
L2Englishchil-
dren,ages34
EL1classesvs.b
ilin-
gualclassesinUS
Tocomparetheeffect
ofTWBEprogram
andEnglishonly
immersionprogram
onchildrensoral
language,l
iteracy
andmath
TW
BEprogramfa-
cilitativeofSpanish
vocabularylearning
w
ithoutexpenseof
Englishloss
C,P
Childrengainedin
la
nguage,l
iteracy
andmathinboth
programs
Kovelman,B
aker,and
Petitto(2008)
150L1Spanishch
il-
dren,ages79
BilingualandEL1
schoolsinUS
Toexaminedifferent
patternsofreading
performanceamong
bilingualchildren
Significantimpact
ofageofonseton
childsreading
performance
C,P
Optimalreading
performanceofthe
childrenlearning
L2beforeage3
TAbLE
2(co
ntinued)
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Authors
Participants
Context
Purpose
Keyfindings
PSP
LipkaandSiegel
(2007)
128ESL;703EL1;
meanstart,age5
ESLclassesinCanada
Tocompareandcon-
trastthepredictors
ofreadingskills
ofESLsandL1Ss
over4years
Proficiencygapex-
pectedtobeclosed
w
ithin4years,with
balancedliteracy
program
C,P
Carhill,Surez-Oroz-
co,andPez(2008)
274L2English
adolescentswith
variousL1s,agesof
arrival714
ESLinUS
Toexamineindividual
andsocialfactors
foracademicEng-
lishL2learning
Tim
espeaking
Englishininformal
settingspositively
associatedwith
Englishlanguage
proficiency
SC
Echevarria,S
hort,and
Powers(20
06)
4406th8thgrade
rs,
5669%Hispan
ic,
3141%Asian/PI
EL1schoolsinUS
Toexaminetheeffect
oftheSIOPmodel
onSsliteracy
achievement
Sshighergaininaca-
demicwritingskills
w
heninstructedby
Tstrainedinthe
SIOPmodel
SC
O.GarcaandBartlett
(2007)
About350L1Spa
nish
secondarySs
Bilingualhighschool
inUS
Toexaminehowa
bilingualeducation
modelcansupport
newlyarrived
Latinoimmigrant
youth
Eng
lishandSpanish
w
erebothvalued
andusedstrategi-
callyforpedagogy
SC
Graduationandstate
exampassrates
high
TAbLE
2(co
ntinued)
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Authors
Participants
Context
Purpose
Keyfindings
PSP
Gillanders(2
007)
1EL1T;5L1Spa
n-
ishpre-Kchildren
EL1pre-Kclassin
US
Toexplorehoweffec-
tiveTsrelationship
withESLchildren
influencesL2learn-
ing
Tsh
owedculturally
sensitivity,estab-
lishedemotional
closeness,incorpo-
ra
tedL1andcre-
atedaninteractive
environmentamong
peers
SC
JiaandAaronson
(2003)
10L1Chinesechil-
dren,s
tartage5
16
EL1schoolsinUS
Toexaminethefac-
torsthatinfluence
languageswitch
andpreference
betweenL1andL2
over3years
Learnersstartingbe-
fo
reage9switched
preferencetoL2in
oneyear
SC
Olderlearners
m
aintainedtheirL1
la
nguagepreference
over3years
KirkSenesac
(2002)
573650Ss;39Ts
TWBEschoolinUS
Toexaminewhat
contributestoa
successfultwo-way
bilingualprogram
over10years
Betterreading
achievementcom-
paredwithdistrict,
nationalnorms
SC
Stro
ngcollaborative
connectionwiththe
homeandcom-
m
unity
TAbLE
2(co
ntinued)
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Authors
Participants
Context
Purpose
Keyfindings
PSP
McIntyre,Kyle,Chen,
Muoz,an
dBeldon
(2010)
7Ts;109ESLSs,
gradesK-6
SIOPclassroomsand
non-SIOPclass-
roomsinUS
Toexaminereading
developmentof
ESLSsinclass-
roomswithSIOP
withoutSIOP
instruction
SIO
PSsmade
significantgainsin
reading,non-SIOP
S
sdidnot
SC
deJong(200
2)
130L1SpanishSs;
128EL1Ss,grades
K5
Bilingualclassesin
US
Toexamineifa
TWBEprogram
succeedsacademi-
cally
TW
BESsgained
g
rade-levelprofi-
ciencyinEnglish
andSpanishbyend
o
fGrade5
SC,P
Abrahamssonand
Hyltenstam
(2009)
195L1SpanishL
2
SwedishSs,started
age147
L2SwedishinSwe-
den
ToexamineL2learn-
erswhosesuccess
couldrejectthe
CPHonpronuncia-
tion
Smalloddsofnative-
likeL2attainment
b
yadultlearners
P
Duursmaetal.(
2007)
96L1SpanishL2
English5thgraders
EL1classesinUS
Tostudytheroleof
homeandschool
factorsonbilin-
gualsvocabulary
development
L2
vocabularynot
associatedwith
E
nglishuseat
h
omeforlowSES
S
s;L1vocabulary
p
ositivelyassoci-
atedwithhomeand
schoolsupportfor
S
panish
P
TAbLE
2(co
ntinued)
(continued)
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Authors
Participants
Context
Purpose
Keyfindings
PSP
BialystokandMiller
(1999)
33L1Chinesespe
ak-
ers;28L1Spanish
speakers,meanstart
age10vs.2
1;28
EL1
ESLinCanada
Toexaminethe
influenceofL1,
structure,task,on
grammaticality
judgment
Differentperformance
patternsforearly
andlategroups
P
Differentperformance
outcomesbetween
Spanishearlyand
la
tegroups,but
notbetweentwo
C
hinesegroups
Birdsongand
Molis
(2001)
61L1Spanishspe
ak-
ers,startagebefore
orafter17
ESLinUS
Toexaminetheage
effectsonnative-
likeattainment
Dec
liningL2profi-
ciencywithincreas-
in
gageoflearning
after17
P
Age
ofacquisition
predictedchildsL2
attainment
Branum-Mar
tin,Foor-
man,Francis,and
Mehta(2010)
1,338L1Spanish
L2
English1stgrad
ers
EL1vs.b
ilingual
classesinUS
Tomodeleffectsof
languageofinstruc-
tion,c
lassroom
differencesand
generalcontexton
bilingualSsL1and
L2readingcompre-
hension
All
factorsinteract
complexlyininflu-
encingSsL1and
L2reading
P
TAbLE
2(co
ntinued)
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Authors
Participants
Context
Purpose
Keyfindings
PSP
Spa
nishmaintenance
programspositively
associatedwith
Spanishreading
comprehension
DeKeyser(2000)
57L1Hungarianim-
migrants,starta
ge
beforeorafter1
6
ESLinUS
Totestthecorrelation
betweenageofar-
rivalandgrammati-
calityperformance
The
oldertheageof
acquisition,t
he
lo
wergrammatical-
ityjudgmentscores
P
Neg
ligiblecorrelation
betweenaptitude
scoresandageof
arrival
DeKeyser,Alfi-
Shabtay,andRavid
(2010)
138L1Russian,
L2EnglishorL
2
Hebrew,s
tartag
e
471
ESLinUS;Hebrew
L2learnersinIsrael
Toexaminetherela-
tionshipbetween
ageofacquisi-
tionandultimate
attainmentinL2
grammar
Significantrelation-
shipbetweenapti-
tu
deandultimate
attainmentforthe
ageofacquisition
1840years
P
deRamreza
ndShap-
iro(2006)
165L1SpanishL2
EnglishSs,acro
ss
Grades15
Bilingualvs.E
L1
classesinUS
Tocomparereading
levelsandgrowth
rateofreading
betweenESLSsin
bilingualandEL1
classrooms
Slowergrowthrate
ofL1SpanishESL
Ssascomparedto
generaleducation
Ssacrossgrades
andovertime
P
TAbLE
2(co
ntinued)
(continued)
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Authors
Participants
Context
Purpose
Keyfindings
PSP
Flegeetal.(2006)
151L1KoreanL2
Englishimmigrants,
ageofarrival6
14
or2140
ESLinUSorCanada
ToevaluateKorean
immigrantsforeign
accent,over1.2
years
Kor
eanchildrenhad
closer-to-native-like
pronunciation
P
Detectableforeign
accent,regardless
ofageofarrival
FlegeandMacKay
(2004)
72L1Italianim-
migrants,ageof
arrival213vs.
1526;18EL1
ESLinCanada
TocompareItalian
learnersperception
ofEnglishvowels
withthatofnative
speakers
Highdiscrimination
scoresbyearly
le
arners
P
MoreL1use,lower
vowelperception
scores
Flege,Yeni-K
omshi-
an,andLiu
(1999)
240L1KoreanL2
Englishimmigrants,
ageofarrival1
23;
24EL1
ESLinUS
TotesttheCPHin
thecontextofL2
acquisition
Morepronounced
fo
reignaccentand
decreasinggram-
m
aticalityjudgment
te
stscoreswith
olderageofarrival
P
Biggereffectsofage
ofarrivalonL2
phonologythan
m
orphosyntax
TAbLE
2(co
ntinued)
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Authors
Participants
Context
Purpose
Keyfindings
PSP
GevaandYaghoub
Zadeh(2006)
181L2Englishlearn-
ersofvariousL1s,
meanage7.37;70
EL1
EL1Schoolsin
Canada
Toinvestigatehow
youngESLchildren
developtheirL2
wordandtextread-
ingefficiency
ESL
andEL1sameon
Englishreadingand
cognitivetasks
P
EL1
betterinoral
English
Hakuta(2011)
11,0
003rd,5th,and
7thgraders;24%
L2Englishlearners
ofvariousL1s
EL1schoolsinUS
Todescribeand
discussthedevelop-
mentofkeyissues
inESLfield
80%
ESLSsinter-
m
ediatein2years,
80%fullyproficient
in
7years
P
Stro
ngassociation
betweenL2profi-
ciencyandcontent
achievement
Hakuta,Bialystok,
andWiley
(2003)
2,016,317L1Span-
ishspeakersand
324,444L1Chi-
nesespeakers
L2EnglishinUS
Toexaminethe
effectofageof
acquisitiononL2
proficiencyina
largesampleofESL
learnerswithat
least10yearsinUS
SuccessinL2acquisi-
tiondeclinedgradu-
allywithincreas-
in
gage,nosharp
decline
P
TAbLE
2(co
ntinued)
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Authors
Participants
Context
Purpose
Keyfindings
PSP
Hemsley,Ho
lm,and
Dodd(200
6)
28L1Samoan;34
L1Vietnamese;
30
EL1,meanage11.3
EL1schoolsinAus-
tralia
Tocomparelexical
skillsof2ESLL1
groupshaving6
yearsofAustralian
schoolingwithEL1
group
Nodifference
betweentwoL1
groups
P
EL1
betteratEnglish
vocabulary,notat
nonwordtasks
JeanandGev
a(2009)
149ESL;64EL1,
Grades4and5
ESLclassesinCanada
Tocomparethe
lexicalknowledge
ofelementary
monolingualEL1
childrenwiththatof
ESLchildren
Nodifferenceoncog-
nitiveprocessingor
w
ordnaming
P
EL1
groupbetterat
Englishvocabulary
LpezandTashakkori
(2004)
117L2EnglishSs
;98
EL1,gradeK1
Bilingualvs.E
L1
classesinUS
Toexaminetheef-
fectsofaTWBE
programonEnglish
literacydevelop-
ment
SsinTWBEand
m
ainstreampro-
gramscoreclosely
in
Englishreading
bytheendofone
year
P
LpezandTashakkori
(2006)
32L2English5th
graders
Bilingualclassesin
US
ToexamineTWBE
andTBEonaca-
demicachievement
withSsofdifferent
L2proficiency
TW
BEandTBEno
differenceinEng-
lishreading
P
TAbLE
2(co
ntinued)
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30
Authors
Participants
Context
Purpose
Keyfindings
PSP
TWBEwassignifi-
cantlybetterthan
TBEprogramon
Spanishreading
Marsdenand
David
(2008)
80L1EnglishSs,
200
vs.6
50hoursof
FL
instruction
FFLandSFLinUK
Tocomparelexical
diversityacrosslan-
guagesandacross
ages
Olderlearnersmore
le
xicallyandin-
flectionallydiverse
la
nguage,because
ofmorehoursof
in
struction
P
McDonald(2
000)
28L1Spanishand
24
L1VietnameseESL
learners,s
tartag
e
before5vs.a
fter
14;14EL1
ESLinUS
Toexaminetowhatex-
tentL2grammatical-
ityjudgmentmight
beinfluencedbyage
ofonsetandL2
Spanishearlylearners
performedcloseto
native
P
Vietnameseearlyand
la
telearnerspoor
performancein
comparisonwith
nativeandSpanish
sp
eakers
Mihaljevi
Djigunovi
(2010)
4148thgraders,start
agebefore10vs.
after10
EFLclassesinCroatia
Tocomparewriting
competenceofearly
andlatebeginners
Lategroupoutper-
fo
rmedbyearly
grouponalltests
P
Earlylearnersstrong
in
teractionofL1
andL2competence
TAbLE
2(co
ntinued)
(continued)
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Authors
Participants
Context
Purpose
Keyfindings
PSP
Miralpeix(2007)
93L1Catalan-Spa
n-
ish,startage8v
s.
11,68yearsof
L2
instruction
EFLclassesinSpain
Toexaminethe
influenceofageof
onset,cognitivema-
turityandamount
ofexposureon
EFLsproductive
vocabulary
Sim
ilarlevelsof
productivevocabu-
la
rybetweenlate
startersandearly
starters
P
Ojima,Matsuba-
Kurita,Nakamura,
Hoshino,andHagi-
wara(2011
)
359L1Japanesep
ri-
marySs,ages69
EFLclassesinJapan
Toinvestigatethe
possibleeffectsof
startinglanguage
learninglateon
phonologicalpro-
cessing
Noevidenceforearly
startersattainment
advantage
P
Positivecorrelation
betweenlonger
hoursofexposure
andEnglishprofi-
ciency
Piske,MacKay,and
Flege(2001)
72L1Italianadults,
L2startedage
720;18EL1
ESLinCanada
TotesttheCPHfrom
theperspectiveof
foreignaccent
Age
ofL2learn-
in
gandamount
ofcontinuedL1
usesignificantly
predicteddegreeof
fo
reignaccent
P
TAbLE
2(co
ntinued)
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Authors
Participants
Context
Purpose
Keyfindings
PSP
Quiroz,Snow
&Zhao
(2010)
50L1SpanishL2
Englishmother-
childpairs
ESLinUS
Toexploretheimpact
ofinteractionand
exposureonyoung
L2learners
-MoreL2inhome,
higherchildL2skills
-Morenonparental
bookreadingand
m
orematernalques-
tionsduringbook
re
ading,higherL1&
L2vocabulary
C
Reichle(2010)
22L2Frenchspea
k-
ers,ageofarrival
134;44L1Fre
nch
speakers
L2Frenchinfranco-
phonecountries
TotestCPHbyex-
amininganomalies
ininformation
structure
Ceiling-levelperfor-
m
anceamongearly
le
arners
P
Effectsofage,
re
gardlessofageof
arrival
vanBoxtel,B
on-
gaerts,and
Coppen
(2003)
30L1GermanandL1
Frenchimmigra
nts,
startage12+;44L1
Dutchspeakers
L2DutchintheNeth-
erlands
TotestlateL2learners
possibilityofacqui-
sitionofL2native-
levelgrammar
Afe
wlearners
performedcloseto
nativenorms
P
Differenceinper-
fo
rmancebetween
L1FrenchandL1
G
ermanspeakers
Yeni-Komshian,
Flege,and
Liu
(2000)
240L1Koreanim
-
migrants,ageof
arrival123;24
L1
Koreanand24EL1
controls
ESLinUS
ToexamineKorean
immigrantsL1and
L2pronunciation
proficiencywhen
comparedwith
monolinguals
You
ngestgrouphad
highestL2pronun-
ciationproficiency,
w
hileoldestgroup
hadbestL1pronun-
ciation
P
TAbLE
2(co
ntinued)
(continued)
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Authors
Participants
Context
Purpose
Keyfindings
PSP
PositiveeffectofL2
usefrequencyand
yearsofschool-
in
ginUSonL2
pronunciation
HarleyandH
art
(1997)
65L1English11th
graders,L2started
atGrade1vs.7
FrenchFLimmersion
classesinCanada
Toexaminetheef-
fectsoflanguage
aptitudeonL2
outcomes
Earlylearnersbet-
te
rinvocabulary
re
cognitionandlate
le
arnersbetterin
w
rittentask
P,F
Larson-Hall(2008)
200L1JapaneseS
s,
L2startage31
2
EFLinJapan
Toinvestigatethe
effectsoflearning
atayoungageon
languageproficien-
cyinthecontextof
minimalinput
Neg
ativecorrelation
betweenstarting
ageandgrammati-
calityjudgment
P,F
Betterperformanceof
earlystartersasa
grouponphonemic
discrimination
Note.
C=childlanguageresearchers;CP=criticalperiod;CPH=criticalperiodhypothesis;
EFL=Englishasaforeignlanguage;EL1=Englishasthefirstlanguage;
ESL=Englishasa
secondlanguage;
F=foreignlanguageeducators;FFL=
Frenchasaforeignlanguage;FL=foreignlanguage;GFL=Germanasaforeignlanguage;L1=firstlanguage;L2
=secondlanguage;
LOTE=languageotherthanEnglish;P=psycholinguists;PI=PacificIslander;PSP=perspectives;SFL=Spanishasaforeignlanguage;TBE=transitionalbilinguale
ducation;TWBE=
two-waybilingua
leducation;pre-K=prekindergarten;
SC=socioculturalresearchers;SIOP
=shelteredinstructionobservationpro
tocol;S=student;T=teacher;US=UnitedStates.
TAbLE
2(co
ntinued)
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Dixon et al.
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2006), its recognition of the importance of motivation and its identification ofrelated variables have made it noteworthy.
Child Language Researchers Perspective
Child language researchers have studied the natural sequence of language acquisi-tion, the role of language input, childrens developmental errors and their verbalinteraction with adults and other children (Bavin, 2009). Research on how a childacquires the L1 has influenced theories in L2 acquisition and practices in L2 edu-cation. Coming from a variety of theoretical orientations, child language research-ers started studying child language with descriptive methods such as parentsdiaries and audio or video transcription of childrens utterances. With the develop-ment of cognitive science and advanced technology, child language researchershave been able to study child language development from the perspective of men-
tal representations of the lexical and syntactical information contained in chil-drens linguistic systems (Gleason & Thompson, 2002). Child languageresearchers have also studied language interactions between caretaker and child orteacher and child, examining what types of interactions promote childrens lan-guage development (Cote, 2001; Pan, Rowe, Singer, & Snow, 2005; Quiroz, Snow,& Zhao, 2010). Child language researchers emphasize the developmental aspectsof L1 and L2 acquisition, for example, that errors are systematic and rule governed(Paradis, 2005; Paradis, Rice, Crago, & Marquis, 2008).
Sociocultural Approaches to L2 Learning
Social and cultural researchers argue that L2 acquisition cannot be fully under-stood without examining the specific social interactions learners engage in withintheir cultural contexts. Originally, sociocultural approaches to L2 learning emergedfrom new perspectives in anthropology, sociology, cultural psychology, and cul-tural studies (Swain & Deters, 2007; Tarone, 2007; Zuengler & Miller, 2006).Sociocultural researchers emphasis on the importance of a learning environmentssocial features in optimizing L2 acquisition is based largely on sociocultural the-ory, which in turn was informed by Vygotskys (1978) developmental theory.Vygotsky argued that all human cognitive processes originate from social interac-tion; what begins as social problem solving or communication is internalized to
become individual cognitive processes (Eun, 2011). Vygotsky argued that learnersreach new levels of development by obtaining mediation from others who havealready mastered the task (Lantolf & Thorne, 2007; Takahashi, 1998).
Another major current in what can be broadly considered the sociocultural per-spective derives from Hallidays systemic functional linguistics (Eggins, 2004).Halliday (1991/2007b) theorized that people use language to create meaningswithin their social and cultural context. Hallidays work emphasized the immedi-ate social context more than the overarching culture, but he acknowledged these asinterrelated. Halliday (1978/2007a) related this to L2 learning by pointing out thatthe L2 learners must learn the new contexts they are likely to encounter in using
the L2 as well as the new types of content that are expected in these new contexts.The interaction between L2 learners and their environment emphasized by
sociocultural theory converts the traditional L2 teachers obsession with linguisticcorrectness into a concern with appropriateness. Bachman (1990) divided L2
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Second Language Acquisition
35
proficiency into organizational competence andpragmatic competence, assertingthat both types of competence were important for successful L2 learning. Bachmandefined organizational competence as the capability to acquire general linguisticknowledge prescribed by traditions and norms andpragmatic competence as theability to apply linguistic knowledge appropriately in different cultural and con-textual situations. After Bachman, researchers have incorporated direct and con-trastive pragmatic teaching into L2 classroom activities (Barron, 2008; Fredsted,2008; A. L. Garca, 2006).
In sum, the sociocultural approach has brought attention to the social and cul-tural dimensions of languages, thus changing the role of the teacher and the goalof and strategies for L2 learning. The purpose of L2 learning is seen as acquisitionof more than linguistic forms; L2 teaching is redirected to assist individual learnersin finding their own effective ways of communicating in different contexts. This
emphasis on the communicative component of languages has given rise to renewedcommunicative teaching in many contexts, refocused on how communication canbe accomplished within specific social and cultural contexts.
The Psycholinguistic Approach to L2 Processing
Psycholinguistic research is interdisciplinary, incorporating theories and researchmethods from linguistics, developmental psychology, neuropsychology, and cog-nitive science. At its most basic, psycholinguistics seeks to explain the internalprocesses that lead to successful (or unsuccessful) L2 learning by observing exter-nal, naturally occurring linguistic behaviors or experimental task performance.
Current research in L2 acquisition from a psycholinguistic perspective answersquestions such as the following: Is information involving two or more languagesprocessed in separate systems or in a shared system? Do bilinguals or multilingualshave a cognitive advantage over monolinguals? Are the processes in L1 and L2language general or language specific? How do L1 and L2 acquisition interact witheach other?
Many psycholinguists use connectionist models in their research. Connectionistcomputational models are derived from close analyses of language learning behav-iors, neuroimaging evidence, and observation of individuals with learning impair-ment. These models propose that input provides the examples learners need to
create connections between basic processing units; more input reinforcing a cer-tain rule leads to a stronger connection, which in turn leads to more predictableperformance (Ellis, 2002, 2003; Seidenberg, 2007).
MacWhinney (2005, 2008) recently proposed a unified model of both L1 andL2 acquisition. Under the unified model, L2 acquisition processes are not verydifferent from L1 acquisition, except that L2 acquisition starts with more informa-tion (from the L1); L2 learners acquire new mappings of sound to meaning basedon the existing L1 system. As learners L2 proficiency increases, the dependenceon L1 decreases.
Although a connectionist framework is widely used by psycholinguists in L2
acquisition research, it has been challenged because of the lack of empirical evi-dence supporting it (VanPatten & Benati, 2010) and its insensitivity to meaningand associated context (Seidenberg, 2007). Pinker (1999) challenged connection-ism on the grounds that it was essentially associative and could not explain the
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Dixon et al.
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application of rules to new verbs, although he suggested irregular verbs and otherexceptions to grammatical rules might be learned in this way. Also from a psycho-linguistic perspective, Cummins (1981) originated the interdependence hypoth-esis, which proposes that certain shared cognitive skills underlie academicproficiency in a bilinguals two languages; this hypothesis has been the focus ofmuch research in L2 acquisition.
The focus of psycholinguistic research on L2 remains strategies rather thanrules, processes rather than outcomes. Psycholinguists, who historically focusedon adult L2 acquisition, have now started to study L2 acquisition in childhood(Paradis, 2007). The uniqueness of psycholinguistics lies in providing theoreticalmodels that offer a fundamental architecture for understanding how L2 acquisitionworks in the mind. In addition, psycholinguists have joined with neuropsycholo-gists in the use of online processing techniques such as event-related brain poten-
tials and functional magnetic resonance imaging to investigate not only word-levellanguage production and comprehension but also sentence-level processing mech-anisms (Brown & Hagoort, 2000). To date, much more work using neurocognitivetechnologies has been done on monolinguals, especially English-speaking mono-linguals, than on speakers of other languages or bilinguals.
Findings
In this section, we provide evidence-based answers to our five questions, usingstudies found through the process detailed in the method section. Although we setout to review studies about L2 acquisition in all kinds of different settings, two
settings dominated the studies found: L2 acquisition of English among children ofimmigrants to the United States and foreign language classroom settings. We inte-grate the research from the four bodies of work to answer each of our five questionsin turn.
Q1: What Are Optimal Conditions for L2 Acquisition?
The definition of optimal conditions is relative; there is no one best way to edu-cate L2 learners. Optimal conditions for acquiring an L2 for different populationsvary according to learning contexts, pedagogical goals, program setup, learnercharacteristics, and the interactions among these contextual variables.
L2 Learners in L2-Majority Contexts
Contextual variables.Reese, Garnier, Gallimore, and Goldenberg (2000) foundthat young children from higher socioeconomic status (SES) homes and thosewhose parents and grandparents attained higher education levels predicted L1 lit-eracy skills, which then promoted L2 reading proficiency in middle school. Carhill,Surez-Orozco, and Pez (2008) found that maternal education and parental L2English skills were significant predictors of oral academic L2 proficiency in ado-lescent immigrantsbut the strength of the association decreased when exposure
to L2 at school and in informal settings were also considered. They also found thatthe opportunity to use L2 in informal settings had the largest effect on L2 oralproficiency, controlling for age, time in the United States, parental L2 skills, andL2 use in school. Interestingly, Jia and Aaronson (2003) found that older children
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in their sample made more friends who mostly used L1 than younger children, whowere limited in their friend pool to those in their class or in their neighborhood.Combined with Carhill et al.s (2008) findings, these results suggest that some ofthe advantage that young L2 learners may have in learning the L2 may be relatedto opportunities to use the L2 with peers. (Age and L2 acquisition are dealt with inmore detail regarding Q4.)
Home environment.Many studies have found a correlation between parents use ofL2 at home and their childrens L2 vocabulary and literacy skills, in some casesseveral years later (Duursma et al., 2007; Hammer, Lawrence, & Miccio, 2008;Quiroz et al., 2010). However, Hammer, Davison, Lawrence, and Miccio (2009)examined L1 Spanish-speaking families change in home language use over 3years, as their children attended 2 years of preschool and 1 year of kindergarten.
Hammer et al. found that increased use of L2 English at home did not help thechildrens L2 vocabulary or literacy development, but it did depress the childrensL1 vocabulary. Hammer et al.s (2009) findings suggest that educators should notask parents to change the language they use at home, recognizing that parents withlow L2 proficiency may not provide the quality of L2 input that their children needfor home L2 use to aid L2 development.
Home literacy practices in L1 or L2, such as frequency of book reading withchildren and taking children to the library, also contribute to later L2 oral languageand literacy achievement (Gonzalez & Uhing, 2008; Hammer, Miccio, & Wagstaff,2003; Reese et al., 2000; Roberts, 2008). Examining home book reading practices
more closely, Quiroz et al. (2010) found that the more mothers asked labelingquestions in L1, the higher their childrens vocabulary was in both L1 and L2,though the effect was stronger for L1.
Bilingual education programs.Bilingual education, particularly two-way pro-grams, is supported by several studies. Winsler, Daz, Espinosa, and Rodrguez(1999) found that young, low-income, Mexican-origin L2 learners of English inthe United States who attended bilingual preschool programs for 1 or 2 yearsgained L2 proficiency, with no harm to their L1 proficiency, compared to a matchedcontrol group. In one secondary school, a bilingual education model that combined
L1 content instruction with intensive L2 instruction for a whole school of L1Spanish speakers, mostly newly arrived immigrants from the same home country,was shown to be highly successful as measured by graduation rates and passingrates on the states challenging graduation exams (O. Garca & Bartlett, 2007).
Two-way bilingual programs combine L2 learners of English who all speak thesame L1 (usually Spanish) with L1 English speakers; the goal is for all students tobecome fully proficient in both languages (de Jong, 2002). Two separate case stud-ies of elementary-level two-way bilingual programs indicate this type of programcan be successful at promoting an L2 among L1 speakers of a minority languageand L1 speakers of the majority language in the United States (de Jong, 2002;
Lpez & Tashakkori, 2004). In a third case study of a preK8 two-way bilingualprogram in the United States with students selected by lottery, Kirk Senesac (2002)found L2 learners of English who had been in the program for at least 5 years
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consistently performed above grade-level monolingual norms on standardizedtests of L2 reading. At the preschool level, children who were randomly assignedto two-way bilingual made equal progress in English oral vocabulary and literacyskills, with better progress in Spanish vocabulary, compared to those who had beenrandomly assigned to English immersion (Barnett, Yarosz, Thomas, Jung, &Blanco, 2007). In a comparison of English L2 learners in two-way bilingual com-pared to transitional bilingual programs, Lpez and Tashakkori (2006) found nodifference between the students English reading proficiency after 4 or 5 years intheir respective programs; however, two-way students met oral English proficiencycriteria for exiting English L2 services more quickly than did transitional bilingualstudents.
Characteristics of instruction.The quality of instruction can also influence L2
outcomes. Optimal conditions for L2 acquisition may include well-implementedspecialized instruction for L2 learners, such as the sheltered instruction observa-tion protocol (SIOP) model (Echevarria, Short, & Powers, 2006; McIntyre, Kyle,Chen, Muoz, & Beldon, 2010). The SIOP model, based on sociocultural princi-ples, includes the following components for lesson planning, implementation, andevaluation: preparation, building background, comprehensible input, strategies,practice or application, lesson delivery, and review or assessment (McIntyre et al.,2010). The SIOP model has been found to improve L2 learners middle schoolwriting (Echevarria et al., 2006) and elementary school reading (McIntyre et al.,2010) skills, compared to students from matched classrooms and schools and con-
trolling for previous achievement.
Time.Branum-Martin, Foorman, Francis, and Mehta (2010) reported that time inL2 reading instruction was positively related to L2, and negatively related to L1,reading comprehension among first-grade English L2 learners in bilingual pro-grams in Texas and California. This finding suggests that cross-linguistic transferdoes not happen immediately or automatically and that sufficient time needs to beallocated to literacy development in L2.
L2 Learners in Foreign Language Settings
Explicit instruction. In foreign language classrooms with limited L2 exposure,teachers explicit instruction about grammatical features of L2 seems to be benefi-cial in L2 learning. White, Muoz, and Collins (2007) found that using explicitinstruction involving contrastive information and repeated contextualized prac-tice (p. 283) to teach English possessive determiners helped students gain moreaccuracy in the posttest on the target structure. Three types of instructionstruc-tured-input instruction that focused on form, output-based instruction that focusedon meaning, and regular communicative-based L2 instructionwere tested in arandomized experiment by Erlam (2003). Erlam found that both the structured-input and output-based groups performed better than controls on orally producingFrench pronouns, but only the output-based class performed significantly betterthan the control group on written production.
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Second Language Acquisition
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Intensity. Students who received 400 hours of L2 instruction in 5 months asopposed to the same number of instructional hours over 10 months did not sig-nificantly differ in their L2 listening comprehension, vocabulary, and spelling(Collins & White, 2011).
Content-based instruction.Wode (1999) found that students studying one subjectthrough L2 English in Germany produced a greater number of lexical itemsandmore that had not come from grade-level L2 textbooksthan the controls who hadthe same amount of L2 language arts instruction.
SummaryOverall, optimal conditions for L2 learners in L2-majority contexts include higherfamily SES and parent and grandparent education, strong home literacy practices,
opportunities for informal L2 use, well-designed and well-implemented educa-tional programs specifically for L2 learners, and sufficient time for L2 literacyinstruction. Of these, educators can influence several: They can encourage homeliteracy practices by sending home books and other literacy materials and prompt-ing parents to read with their children in either L1 or L2 and to take their childrento the library; they can promote informal L2 use by mixing L2 learners with L1speakers and encouraging integrated extracurricular activities; they can ensure theeducational programs and lesson plans implemented in their schools followresearch-tested designs and are well implemented; and they can ensure sufficienttime is apportioned to literacy development in the L2. Research in optimal condi-
tions for L2 learners in a foreign language setting is more sparse. However, itappears that explicit instruction helps students, particularly in learning grammar,that intensity of L2 instruction makes no difference, and that using academic con-tent to teach the L2 may be beneficial to building vocabulary in the L2.
Each of the four perspectives contributed to these findings. Foreign languageeducators tended to study the effect of different instructional techniques, programfeatures, or program configurations on L2 outcomes. Child language researchersexamined how young L2 learning children fare in different contexts and studiedthe role of L1 proficiency on L2 outcomes. Sociocultural studies focused on pro-grams that take an explicit interest in social or cultural context, such as SIOP and
two-way bilingual. Two-way bilingual programs also build on the work of childlanguage researchers who note childrens strength in implicit language learning.Psycholinguistic studies on optimal conditions in L2 learning quantified the effectsof different contextual variables on L2 outcomes. Results must be viewed cau-tiously; most of the studies reviewed for this question lacked randomization andadequate controls and were investigated only with a small sample, weak