The Cognition Hypothesis: A Synthesis and Meta-Analysis of Research on Second Language Task Complexity.

This study employed synthetic and meta-analytic techniques to review the literature on the Cognition Hypothesis, which predicts that increasing task complexity influences the quality of second language production. Based on 8 inclusion criteria, 17 published studies were synthesized according to key features. A subset of these studies (k = 9) was also meta-analyzed to investigate the overall effects of raising resource-directing task demands on learner output during monologic tasks. The synthesis of 17 primary studies revealed an assortment of treatments and measures. Among the 9 comparable studies, the meta-analysis uncovered small positive effects for accuracy and small negative effects for fluency. This lends support to the Cognition Hypothesis; however, the present study also disconfirms predictions regarding syntactic complexity. Implications for research and pedagogy are discussed.

[1]  YouJin Kim,et al.  TASK COMPLEXITY, LEARNING OPPORTUNITIES, AND KOREAN EFL LEARNERS’ QUESTION DEVELOPMENT , 2012, Studies in Second Language Acquisition.

[2]  Judit Kormos,et al.  The Role of Task Complexity, Modality, and Aptitude in Narrative Task Performance , 2012 .

[3]  Folkert Kuiken,et al.  Task complexity and linguistic performance in L2 writing and speaking: the effect of mode , 2011 .

[4]  Peter Robinson,et al.  Second language task complexity : researching the cognition hypothesis of language learning and performance , 2011 .

[5]  Marije Michel,et al.  Effects of Task Complexity and Interaction on L2-Performance , 2011 .

[6]  P. Robinson.  Task-Based Language Learning , 2011 .

[7]  S. Gass,et al.  Quantitative Research Methods, Study Quality, and Outcomes: The Case of Interaction Research , 2011 .

[8]  N. Spada,et al.  Interactions between Type of Instruction and Type of Language Feature: A Meta-Analysis. , 2010 .

[9]  Guoxing Yu,et al.  Lexical Diversity in Writing and Speaking Task Performances , 2010 .

[10]  Peter Robinson,et al.  13. Situating and distributing cognition across task demands: The SSARC model of pedagogic task sequencing , 2010 .

[11]  Frederick L. Oswald,et al.  Meta-analysis in Second Language Research: Choices and Challenges , 2010, Annual Review of Applied Linguistics.

[12]  Peter Skehan,et al.  Modelling Second Language Performance: Integrating Complexity, Accuracy, Fluency, and Lexis , 2009 .

[13]  J. Norris,et al.  Towards an Organic Approach to Investigating CAF in Instructed SLA: The Case of Complexity , 2009 .

[14]  Teresa Cadierno,et al.  Time and Motion: Measuring the Effects of the Conceptual Demands of Tasks on Second Language Speech Production , 2009 .

[15]  G. Pallotti.  CAF: Defining, Refining and Differentiating Constructs , 2009 .

[16]  Andrea Révész,et al.  TASK COMPLEXITY, FOCUS ON FORM, AND SECOND LANGUAGE DEVELOPMENT , 2009, Studies in Second Language Acquisition.

[17]  YouJin Kim,et al.  The effects of task complexity on learnerlearner interaction , 2009 .

[18]  中浜 優子.  タスクの複雑性、母語、日本語能力が談話構成に及ぼす影響--指示表現・受身表現の使用について , 2009 .

[19]  Kris Van den Branden,et al.  Task-based language teaching : a reader. , 2009 .

[20]  Pauline Foster,et al.  Task Design and Second Language Performance: The Effect of Narrative Type on Learner Output , 2008 .

[21]  Folkert Kuiken,et al.  Cognitive Task Complexity and Written Output in Italian and French as a Foreign Language. , 2008 .

[22]  P. Robinson,et al.  Attention and Memory during SLA , 2008 .

[23]  Peter Robinson,et al.  Task complexity, theory of mind, and intentional reasoning: Effects on L2 speech production, interaction, uptake and perceptions of task difficulty , 2007 .

[24]  P. Robinson,et al.  Task complexity, the Cognition Hypothesis and second language learning and performance , 2007 .

[25]  Folkert Kuiken,et al.  The influence of complexity in monologic versus dialogic tasks in Dutch L2 , 2007 .

[26]  Folkert Kuiken,et al.  Task complexity and measures of linguistic performance in L2 writing , 2007 .

[27]  Roger Gilabert,et al.  Effects of manipulating task complexity on self-repairs during L2 oral production , 2007 .

[28]  Lourdes Ortega,et al.  Synthesizing research on language learning and teaching , 2006 .

[29]  Margaret Thomas,et al.  8. Research synthesis and historiography: The case of assessment of second language proficiency , 2006 .

[30]  H. Rothstein,et al.  Information retrieval and the role of the information specialist in producing high-quality systematic reviews in the social, behavioural and education sciences , 2006 .

[31]  Rod Ellis,et al.  Planning and task performance in a second language , 2005 .

[32]  Peter Skehan,et al.  7. Strategic and on-line planning: The influence of surprise information and task time on second language performance , 2005 .

[33]  L. Ortega.  Syntactic Complexity Measures and Their Relationship to L2 Proficiency: A Research Synthesis of College-Level L2 Writing. , 2003 .

[34]  R. Hout,et al.  Lexical richness in the spontaneous speech of bilinguals , 2003 .

[35]  P. Robinson.  Individual differences and instructed language learning , 2002 .

[36]  Peter Robinson,et al.  Cognition and Second Language Instruction: Task complexity, cognitive resources, and syllabus design: a triadic framework for examining task influences on SLA , 2001 .

[37]  Noriko Iwashita,et al.  Can We Predict Task Difficulty in an Oral Proficiency Test? Exploring the Potential of an Information‐Processing Approach to Task Design , 2001 .

[38]  P. Robinson.  Task complexity, task difficulty, and task production: exploring interactions in a componential framework , 2001 .

[39]  J. Norris,et al.  Effectiveness of L2 Instruction: A Research Synthesis and Quantitative Meta‐analysis , 2000 .

[40]  A. Vermeer.  Coming to grips with lexical richness in spontaneous speech data , 2000 .

[41]  P. Skehan.  A FRAMEWORK FOR THE IMPLEMENTATION OF TASK-BASED INSTRUCTION , 1996 .

[42]  P. Robinson,et al.  Investigating Second Language Task Complexity , 1995 .

[43]  Peter Robinson,et al.  Task Complexity and Second Language Narrative Discourse , 1995 .

[44]  Margaret Thomas,et al.  Assessment of L2 Proficiency in Second Language Acquisition Research , 1994 .

[45]  Michael H. Long,et al.  Three Approaches to Task‐Based Syllabus Design , 1992 .

[46]  G. Glass.  Primary, Secondary, and Meta-Analysis of Research1 , 1976 .

[47]  Teresa Cadierno,et al.  Language typology, task complexity and the development of L2 lexicalization patterns for describing motion events , 2009 .

[48]  Roger Gilabert,et al.  Manipulating cognitive complexity across task types and its impact on learners' interaction during oral performance , 2009 .

[49]  F. Kuiken,et al.  Task complexity and linguistic complexity in L2 writing , 2007 .

[50]  Peter Robinson,et al.  Cognitive Complexity and Task Sequencing: Studies in a Componential Framework for Second Language Task Design , 2005 .