The Effects of Repetition on Incidental Vocabulary Learning: A Meta-Analysis of Correlational Studies

Author: Takumi Uchihara, Stuart Webb, Akifumi Yanagisawa · Type: academic · Status: draft · URL: https://onlinelibrary.wiley.com/doi/abs/10.1111/lang.12343

Licence: Paywalled (Wiley, Language Learning 69(3), 559-599, 2019); abstract quotable, full text requires subscription

Summary

Meta-analysis of 45 effect sizes from 26 studies (N = 1,918) on how the number of encounters with a word during reading or listening relates to incidental vocabulary learning. The mean correlation is r = .34, a medium effect: repetition helps, but frequency of encounter explains only a modest share of what gets learned. Moderators included learner age, prior vocabulary knowledge, spacing of encounters, visual support, and engagement level. For Immersive this justifies the pipeline design of reading (many incidental encounters) feeding deliberate FSRS study (which closes the gap incidental exposure leaves), rather than relying on either alone.

Insights

• Across 26 studies (N = 1,918), the number of encounters with a word correlates r = .34 with incidental vocabulary learning: repeated exposure helps but is nowhere near sufficient on its own. (high, draft) incidental learning vocabulary meta-analysis

  The synthesis revealed a medium effect (r = .34) of repetition on incidental vocabulary learning. — Abstract

• The repetition-learning relationship is moderated by spaced learning, visual support, and learner engagement, meaning a reader that spaces re-encounters and adds visual aids amplifies incidental learning. (medium, draft) incidental learning spaced repetition product design

  Paraphrase of abstract: moderator analyses identified learner variables (age, vocabulary knowledge) and treatment variables (spaced learning, visual support, engagement, range in encounters) as significant moderators. — Abstract

• Because incidental gains per encounter are modest, combining extensive reading with deliberate spaced retrieval of the words met while reading is better supported than either method alone. (medium, draft) incidental learning spaced repetition extensive reading

  Paraphrase: a medium correlation of r = .34 implies many words met in reading will not be retained without additional deliberate learning. — Interpretation of abstract findings