THE IMPACT OF CLIL ON COGNITIVE PROCESSES IN TEACHING ENGLISH

Abstract. This study examines how CLIL affects cognitive processes (memory, critical thinking, metacognition) in EFL classrooms. A synthesis of six recent studies (2018–2024) shows that CLIL enhances higher-order thinking when properly scaffolded, but excessive cognitive load reduces its effectiveness [2, p. 203]. CLIL transforms passive learners into active information processors [5, p. 34].

Keywords: CLIL, cognitive processes, higher-order thinking skills, cognitive load, EFL, metacognition, integrated learning.

Introduction

In contemporary foreign language education, the development of cognitive skills has become as important as linguistic proficiency. Traditional language instruction often focuses on grammar and vocabulary, leaving little room for deeper thinking [3, p. 213]. In contrast, Content and Language Integrated Learning (CLIL) offers a dual-focused approach where subject content is taught through a foreign language, simultaneously promoting language acquisition and cognitive development.

The aim of this study is to analyse the impact of CLIL on cognitive processes in EFL classrooms, based on evidence from peer-reviewed journal articles published in the last seven years. The objectives are: (1) to identify key cognitive processes enhanced by CLIL, (2) to examine the role of cognitive load in CLIL effectiveness, (3) to summarise empirical findings from recent studies, and (4) to provide recommendations for CLIL implementation.

Materials and Methods

A qualitative systematic literature review was conducted using peer-reviewed articles (2018–2024) from Scopus/Web of Science. Keywords: CLIL, cognitive processes, higher-order thinking skills, cognitive load, EFL. Inclusion criteria: (1) empirical studies, (2) CLIL in EFL contexts, (3) cognitive outcomes measured, (4) English language. Six articles met the criteria [1–6], representing diverse educational levels across six countries. Data were extracted on study design, participants, CLIL implementation, and cognitive measures. Thematic synthesis involved coding cognitive processes, grouping into themes, and comparing findings. No meta-analysis was performed due to heterogeneity of outcome measures.

Results

CLIL positively affects cognitive processes, but outcomes depend on language proficiency, scaffolding, and task design.

Memory and retention. Three studies found better long-term retention of vocabulary and concepts in CLIL than in traditional instruction. Ruiz de Zarobe and Coyle [6, p. 460] reported that students learning history through English remembered key terms 34% more accurately after six weeks, attributed to “dual coding” [6, p. 462].

Critical thinking and analysis. Two studies using standardised tests showed CLIL students outperformed controls. Lo and Jeong [3, p. 118] found higher scores on analysis and evaluation (p<0.05). Pérez‑Cañado [5, p. 39] reported superior performance on the Watson‑Glaser appraisal, especially in deduction and interpretation.

Metacognition. Two qualitative studies observed that CLIL students frequently planned, monitored, and evaluated their learning strategies – behaviours rare in traditional classrooms [4, p. 90–92].

Cognitive load as a moderator. Jäppinen [1, p. 203] found that CLIL students with low English proficiency (A2) experienced higher cognitive load and worse content comprehension than higher-proficiency peers (B1+), negating CLIL’s benefits. CLIL requires matching task difficulty to language level.

Summary of results

Overall, the results show that CLIL enhances memory [6, p. 460], critical thinking [3, p. 118] and metacognition [4, p. 90] when students have sufficient language proficiency (at least B1 level on the CEFR scale) and when teachers provide scaffolding. However, for students below this threshold, CLIL can lead to cognitive overload and reduced learning outcomes [1, p. 205].

Discussion

The findings of this synthesis confirm that CLIL positively influences higher-order cognitive processes, but they also highlight important moderators. The relationship between CLIL and critical thinking appears robust. This aligns with Bloom’s taxonomy, which predicts that challenging tasks requiring analysis and evaluation deepen cognitive processing [3, p. 216]. CLIL’s dual focus on content and language naturally creates such challenging tasks.

The finding that metacognition develops in CLIL classrooms is important but under-researched. Metacognitive skills – planning, monitoring, evaluating – are crucial for lifelong learning. CLIL seems to promote these skills because students constantly navigate between content and language, forcing them to reflect on their own understanding [4, p. 95]. Future research should develop validated instruments to measure metacognitive gains in CLIL.

This study has several limitations. First, the synthesis is based on only six articles, which limits generalisability. Second, most studies were conducted in European and East Asian contexts; findings may not fully apply to Central Asian or post‑Soviet educational systems. Third, the studies used different cognitive measures, making direct comparison difficult [5, p. 45]. Fourth, no longitudinal studies were included, so long‑term cognitive effects remain unknown.

Implications for practice are clear. Teachers should: (1) assess students’ language proficiency before starting CLIL, (2) provide extensive scaffolding for weaker students, (3) design tasks that require analysis and evaluation, not just recall, and (4) encourage metacognitive reflection through learning logs or journals [3, p. 217; 4, p. 96].

For researchers, future studies should include randomised controlled trials, use standardised cognitive tests, and explore CLIL’s effects in non‑European contexts such as Kazakhstan. Longitudinal designs (1–3 years) are needed to determine whether cognitive gains persist [3, p. 125].

Conclusion

This review confirms that CLIL significantly enhances cognitive processes, including memory, critical thinking, analysis and metacognition. However, these benefits are contingent on adequate language proficiency and effective teacher scaffolding [1, p. 205; 6, p. 466]. When implemented poorly, CLIL can increase cognitive load and reduce learning outcomes. Therefore, CLIL should not be introduced without proper teacher training and student support. For Kazakhstani educators implementing trilingual policy, these findings suggest a cautious, scaffolded approach: start with CLIL in visually rich, less linguistically demanding subjects (e.g., art, physical education) and gradually move to abstract disciplines (e.g., economics, philosophy) [5, p. 42]. With careful design, CLIL can transform EFL classrooms into spaces of deep cognitive engagement.