In his Cognitive theory of multimedia learning (CTML) mentions that words and pictures, which are presented to the learner through a multimedia presentation, are processed along two separate, non-conflicting channels. They enter the sensory memory through the ears and eyes. Words and images are actively selected by the learner from the sensory memory and enter the working memory where they are organized into a verbal model and a pictorial model.
Zhu (2012) this study focuses on the diversity feature of videos. Video appeals to different senses via sound, image, color and shape at the same time. This variety is of such great importance in terms of dealing with different learners and learning styles. In his study suggests that using videos to teach grammar to ESP students motivated the students to take part in the lessons.