Cognitive Processing of Task Complexity by ESL Learners with Varying Capacity of Working Memory and Second Language Proficiency: A Critical Review
DOI:
https://doi.org/10.62843/jrsr/2026.v.iv.226Keywords:
Task-Based Language Teaching, Cognitive Hypothesis, Task Complexity, Working Memory, L2 Proficiency,, Second Language Acquisition.Abstract
Despite the extensive task-based language teaching (TBLT) research available on Robinson’s (2015) Cognitive Hypothesis, the findings of these studies are largely inconsistent, and at times contradictory. This paper aims to critically analyze the methodological practices of existing TBLT research with reference to task complexity. It also intends to investigate how working memory is operationalized by these studies. Adopting a Critical Interpretative Synthesis Methodological approach, the findings of this critical evaluation reveal some methodological and theoretical limitations of the existing literature. One of the limitations is either excessive or insufficient increase in the complexity of second language learning tasks while another significant one is the underassessed role of working memory in ESL learners with low proficiency level of the target language. Based on the findings, this review offers several implications for future research related to Cognitive Hypothesis.
References
Ansari, E., & Shafiee, S. (2018). Impacts of resource dispersing and resource directing task dimensions on EFL learners’ oral production. International Journal of English Linguistics, 8(6).
Attarzade, S., & Farahani, E. (2014). The effect of task complexity on Iranian EFL learners’ listening comprehension across aptitude. Procedia - Social and Behavioral Sciences, 98, 314–323. https://doi.org/10.1016/j.sbspro.2014.03.422
Awwad, A., & Tavakoli, P. (2022). Task complexity, language proficiency and working memory: Interaction effects on second language speech performance. International Review of Applied Linguistics in Language Teaching, 60(2), 169–196. https://doi.org/10.1515/iral-2018-0378
Baddeley, A. D. (2012). Working memory: Theories, models and controversies. Annual Review of Psychology, 63, 1–29. https://doi.org/10.1146/annurev-psych-120710-100422
Cho, M. (2018). Task complexity, modality, and working memory in L2 task performance. System, 72, 85–98. https://doi.org/10.1016/j.system.2017.10.010
Donate, A., & Leow, R. (2024). Task complexity, task features, and task anxiety at low L2 proficiency levels. In S. Li (Ed.), Individual differences and task-based language teaching (pp. 111–137). John Benjamins. https://doi.org/10.1075/tblt.16.04don
Dixon-Woods, M., Cavers, D., Agarwal, S., Annandale, E., Arthur, A., Harvey, J., Hsu, R., Katbamna, S., Olsen, R., Smith, L., Riley, R., & Sutton, A. J. (2006). Conducting a critical interpretive synthesis of the literature on access to healthcare by vulnerable groups. BMC Medical Research Methodology, 6, Article 35. https://doi.org/10.1186/1471-2288-6-35
Frear, M. W., & Bitchener, J. (2015). The effects of cognitive task complexity on writing complexity. Journal of Second Language Writing, 30, 45–57. https://doi.org/10.1016/j.jslw.2015.08.009
Fay, A., & Buchweitz, A. (2014). Listening comprehension and individual differences in working memory capacity in beginning L2 learners. Letrônica, 7(1), 113–129.
Gui, J., & Ismail, S. M. (2024). The effect of planning time on vocabulary acquisition in a task-based environment: The mediating roles of working memory and field (in)dependence. BMC Psychology, 12, Article 145. https://doi.org/10.1186/s40359-024-01638-4
Hayes, J. R. (2012). Modeling and remodeling writing. Written Communication, 29(3), 369–388. https://doi.org/10.1177/0741088312451260
Jackson, D. O., & Suethanapornkul, S. (2013). The cognition hypothesis: A synthesis and meta-analysis of research on second language task complexity. Language Learning, 63(2), 330–367. https://doi.org/10.1111/lang.12008
Jiang, H., & Farquharson, K. (2018). Are working memory and behavioral attention equally important for both reading and listening comprehension? A developmental comparison. Reading and Writing, 31, 1449–1477. https://doi.org/10.1007/s11145-018-9840-y
Jung, J. (2018). Effects of task complexity and working memory capacity on L2 reading comprehension. System, 74, 21–37. https://doi.org/10.1016/j.system.2018.02.005
Kellogg, R. (1996). A model of working memory in writing. In C. M. Levy & S. Ransdell (Eds.), The science of writing: Theories, methods, individual differences, and applications (pp. 57–71). Lawrence Erlbaum Associates.
Li, S., & Fu, M. (2018). Strategic and unpressured within-task planning and their associations with working memory. Language Teaching Research, 22(2), 230–253. https://doi.org/10.1177/1362168816684367
Luo, X. (2022). The effect of manipulating task complexity along resource-dispersing dimension on L2 written performance from the perspective of complexity theory. English Language Teaching, 15(9), 151–159.
Manchón, R. M., McBride, S., Martínez, M. D. M., & Vasylets, O. (2023). Working memory, L2 proficiency, and task complexity: Independent and interactive effects on L2 written performance. Studies in Second Language Acquisition, 45(3), 737–764.
Mavrou, I. (2020). Working memory, executive functions, and emotional intelligence in second language writing. Journal of Second Language Writing, 50, Article 100758.
Nouwens, S., Groen, M. A., Kleemans, T., & Verhoeven, L. (2021). How executive functions contribute to reading comprehension. British Journal of Educational Psychology, 91(1), 169–192. https://doi.org/10.1111/bjep.12355
Qian, L., Shamsudin, S., & Don, Z. M. (2024). Effects of task complexity on Chinese EFL learners’ language production in synchronous computer-mediated communication. SAGE Open, 14(3). https://doi.org/10.1177/21582440241273866
Robinson, P. (2015). The cognition hypothesis, second language task demands, and the SSARC model of pedagogic task sequencing. In M. Bygate (Ed.), Domains and directions in the development of TBLT (pp. 87–121). John Benjamins.
Robinson, P. (2022). The cognition hypothesis and individual difference factors. In The Routledge handbook of second language acquisition and individual differences (pp. 3–33). Routledge.
Robinson, P., & Gilabert, R. (2007). Task complexity, the cognition hypothesis and second language learning and performance. IRAL: International Review of Applied Linguistics in Language Teaching, 45(3), 161.
Sánchez, L., & Sunesson, M. (2023). Grasping the effects of storyline complexity, task structure and proficiency in narrative writing performance. Journal of Second Language Writing, 60, Article 100986. https://doi.org/10.1016/j.jslw.2023.100986
Santos, S. (2018). Effects of task complexity on the oral production of Chinese learners of Portuguese as a foreign language. Journal of the European Second Language Association, 2(1).
Sasayama, S. (2016). Is a ‘complex’ task really complex? Validating the assumption of cognitive task complexity. The Modern Language Journal, 100(1), 231–254. https://doi.org/10.1111/modl.12313
Skehan, P. (2009). Modelling second language performance: Integrating complexity, accuracy, fluency, and lexis. Applied Linguistics, 30(4), 510–532.
Skehan, P. (2018). Second language task-based performance: Theory, research, assessment. Routledge.
Skehan, P., & Foster, P. (2001). Cognition and tasks. In P. Robinson (Ed.), Cognition and second language instruction (pp. 183–205). Cambridge University Press.
Sweller, J. (2011). Cognitive load theory. In Psychology of learning and motivation (Vol. 55, pp. 37–76). Academic Press.
Johnson, M. D., & Tabari, M. A. (2025). Linguistic complexity in second language writing: Insight from studies on task planning. Language Teaching, 58(1), 1–13.
Tajeddin, Z., & Bahador, H. (2012). Pair grouping and resource-dispersing variables of cognitive task complexity: Effects on L2 output. Iranian Journal of Applied Linguistics, 15(1), 123–149.
Xu, T. S., & Zhang, L. J. (2023). Effects of cognitive task complexity and online planning on second language learners’ argumentative writing. Frontiers in Psychology, 14, Article 1121994.
Xu, T. S., Zhang, L. J., & Gaffney, J. S. (2022). Examining the relative effects of task complexity and cognitive demands on students’ writing in a second language. Studies in Second Language Acquisition, 44(2), 483–506.
Zhan, J., Sun, Q., & Zhang, L. J. (2021). Effects of manipulating writing task complexity on learners’ performance in completing vocabulary and syntactic tasks. Language Teaching Research. https://doi.org/10.1177/13621688211024360
Zhou, H., Rossi, S., & Chen, B. (2017). Effects of working memory capacity and tasks in processing L2 complex sentence: Evidence from Chinese-English bilinguals. Frontiers in Psychology, 8, Article 205425.
Downloads
Published
Issue
Section
License

This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
