investigating the effect of graphic organizer strategy instruction on iranian auditory and visual learners’ vocabulary

this study was conducted to investigate the effect of graphic organizer vocabulary instruction on iranian visual and audio elementary efl learners’ vocabulary learning. for this purpose, 80 learners of english participated in this study. all the groups were taught the same textbooks. oxford placement test which included vocabulary, grammar, and reading items was used in order to get homogenized groups of participants. they were also given a vocabulary pretest, the purpose of which was to measure the learners’ initial knowledge of the target words. the treatment procedure took ten sessions with thirty-minute each session. during each session, the students in the experimental groups were presented with 10 new words' pictures on a4 papers. in the control groups, the learners got the list of the new vocabulary with the synonyms and definitions. finally, at the end of the course all the groups sat for the posttest of lexical knowledge. then the statistical analysis was run through two-way anova. the results of the study indicated that the learners’ who were provided with visual input outperformed the other groups.