The Effect of Video Image Size and Screen Refresher Rate on Content Mastery and Source Credibility in Distance Learning Systems.

In a laboratory setting, this study examined the effect of image size and refresh rate of those images on the subjects abilities to recall content, and subjects perceptions of source credibility. The results suggest that larger images and faster refresh rates do not increase content retention. Further analysis revealed that larger, more realistic televised lectures do not significantly enhance source credibility along the dimensions of attention, confidence, relevance, or satisfaction. This study lends evidence to the notion that Internet based course delivery, using small, slow images may be as effective in terms of learning outcomes and satisfaction, as high bandwidth networks.