Incidental vocabulary learning

Incidental vocabulary learning is often seen as superior to direct instruction on many occasions. Meanwhile, upon the emergence of the World Wide Web, second language (SL) learners have been introduced to 'podcasts' (recorded audio and video online broadcasts) which could be authentic sources of vocabulary learning. The relatively recent phenomenon of video podcast (vodcast) might be considered as a reliable complementary source of input to the written text or the audio track which are predominantly used to represent the platforms of SL instruction. To examine this assertion, three groups of Iranian EFL learners (n=63) were independently exposed to different modes of input (the reading text, audio track, and vodcast) during a series of classroom sessions under highly controlled circumstances. Immediate and delayed passive recall tests of vocabulary were administered to investigate their incidental gains. A multivariate analysis of variance revealed that both dependent variables (immediate and delayed recall) were significantly affected by the input modes. The post-hoc tests indicated no significant difference between the written and the audio groups while the vodcast group significantly outperformed the other two. The rich contextual clues made available by this audiovisual source seem to account for its superiority

The present study explored the effects of three forms of reading-based L2 vocabulary tasks on learning and retention of 40 target words by Iranian intermediate and advanced male English as a Foreign Language (EFL) learners. To this end, 176 EFL learners were randomly selected and assigned to three experimental and one control condition across two levels of intermediate and advanced proficiency levels. The participants in the experimental conditions read 8 texts including 40 target words and performed word-focused (WF) tasks, oral reproduction (OR) plus summary writing (SW) tasks, and WF plus OR vocabulary tasks incorporating target words according to their task designation. The results of two-way MANOVA and Scheffe’s post-hoc test demonstrated that while all three experimental conditions significantly outperformed the control group in terms of learning and retention of target words, the WF plus OR task was found to be the most effective condition. The results are justified in light of Laufer and Hulstjin’s (2001) Involvement Load Hypothesis, Nation and Webb’s (2011) Technique Feature Analysis, the Skill Acquisition Theory, and Swain’s (1985) Output Hypothesis. The study concluded with pedagogical implications for language teachers and materials developers with regard to including both word-focused and meaning-oriented L2 vocabulary tasks in language classes and language textbooks.

The present study compares the effects of the second language (L2) reading and listening on incidental vocabulary learning and retention of three dimensions of word knowledge (i.e., part of speech, syntagmatic association, and form-meaning connection) among EFL learners. The relationship between word exposure frequency and vocabulary learning is also examined in reading versus listening. Sixty-three pre-intermediate EFL learners in four intact classes were randomly assigned to four experimental groups based on the number of target word (TW) exposures (i.e., 1, 3, 5, and 7 exposures) they received in treatment texts. The experimental groups read and listened to four texts with 36 TWs. The scores on the immediate and three-week delayed posttests revealed that reading contributed to a greater amount of vocabulary learning and retention in the three dimensions of word knowledge. The results further revealed that an increase in the word exposure frequency had a significant effect on acquiring form-meaning connection through reading, and on three dimensions through listening. Moreover, frequency improved retention gains in both input sources.