Abstract
Video captioning is a useful tool for language learning. In the literature, video captioning has been investigated by many studies and the results indicated that video captioning may foster vocabulary learning. Most of the previous studies have investigated the effect of full captions on vocabulary learning. One of the key aspects of vocabulary learning is pronunciation. However, the use of mobile devices for teaching pronunciation has not been investigated conclusively. Therefore, this paper attempts to examine the effect of implementing keyword video captioning on L2 pronunciation using mobile devices. Thirty-four Arab EFL university learners participated in this study and were randomly assigned to two groups (key-word captioned video and full captioned video). The study is an experimental one in which pre-and post-tests were administered to both groups. The results indicated that keyword captioning is a useful mode to improve learner's pronunciation. The post test results indicate that there was no statistically significant difference between the two modes of captioning on vocabulary learning. However, learners at keyword video captioning performed better that full video captioning.