language learning aptitude

Robinson’s Cognition Hypothesis and Skehan’s Limited Attentional Capacity Model provide the major impetus for this study. The present article reports the findings of a between-subject factorial experimental research study which explored 1) the effects of increased cognitive task complexity, manipulated through the intentional reasoning demands and number of elements on the lexical and syntactic complexity, accuracy, and fluency (CAF) of EFL writers’ productions; and 2) the joint effects of cognitive task complexity factor and learners’ language learning aptitude (Low vs. High) on the written output. Firstly, we gave Carroll and Sapon’s Modern Language Aptitude Test (MLAT) to 226 participants and then did a random stratification of the low- and high- aptitude learners into three groups. The participants received letter writing tasks with different cognitive complexity levels (low, medium, and high). The findings indicated that increasing cognitive task complexity resulted in significantly higher lexical and syntactic complexity and lower fluency, whereas no significant effect was found on writing accuracy. Moreover, the statistical results revealed no significant interaction effect between task complexity factors and learners’ language aptitude. With regard to the first objective of the study, the findings supported the predictions of Cognition Hypothesis while it is not the case in relation to the second objective of the study.

This study aimed at examining the main and interaction effects of increased intentional reasoning demands, planning time, and also language learning aptitude on syntactic complexity, accuracy, lexical complexity, and fluency (CALF) of 226 EFL learners’ performance on letter writing tasks. The participants were first randomly assigned to three experimental groups to be given a task with differing degrees of reasoning demand (low, medium, and high) to each group. Then, within each reasoning group, we reassigned an equal number of high- and low- aptitude learners to Planning and No-planning groups by random stratified sampling. The results revealed that (a) increasing task complexity with regard to the amount of intentional reasoning demands resulted in greater lexical and syntactic complexity and less fluency while no significant effect was observed on accuracy; (b) increasing task complexity through planning time led to significantly lower syntactic complexity and fluency; (c) reasoning demands and planning time had a significant interaction effect on accuracy; and (d) the interaction effect of language aptitude was significant with neither planning nor reasoning factor, but a three-way interaction effect was found on accuracy. The findings are discussed in relation to cognitive task complexity (CTC) models which were the main impetus for this study.