Notifications and Cognitive Load: A Comparative Study of Silent versus Interrupted TESOL Classrooms

Abstract

In everyday classroom life of the common occurrence of smartphones has raised up pressing strains for language educators about how digital interruptions form learning. This study examines how smartphone notifications affect cognitive load, task performance, and attentional stability among learners of English as a Foreign Language (EFL) in Teaching English to Speakers of Other Languages (TESOL) settings. Using a quasi-experimental, between-subjects design, two groups of undergraduate EFL students (N = 40) completed an identical reading and vocabulary lesson: one group worked with smartphones silenced (n = 20), while the other received standardized notification interruptions throughout the lesson (n = 20). Long-standing debate in this literature has centered on whether the mere presence of a phone, independent of active use, is sufficient to tax working memory — the so-called “brain drain” hypothesis. The present findings, consistent with a growing body of recent work, suggest otherwise. Students in the interrupted condition reported significantly higher cognitive load (M = 3.95, SD = 0.72) than their silent-classroom counterparts (M = 2.80, SD = 0.60), t(38) = 3.45, p = .001, and scored markedly lower on a 20-item reading and vocabulary assessment (M = 71.20%, SD = 9.45 versus M = 84.50%, SD = 7.10), t(38) = 5.01, p < .001. Both differences correspond to very large effect sizes by conventional benchmarks (Cohen's d = 1.74 and 1.59, respectively). Independent of group assignment, 90% of participants reported preferring a notification-free learning environment. Together, these results indicate that active auditory and visual alerts, rather than passive phone presence, are the primary drivers of extraneous cognitive load in the language classroom, and they point toward a shift away from broad “mobile-learning” framing and toward concrete, actionable notification-management practices in TESOL pedagogy.