Justin Briggs illustrates the order in which search engine users fix their attention on search results that include video thumbnails in his excellent post, How Does Google Authorship Impact CTR?
I pulled the following quote from his blog to put the accompanying heatmap in context:
“…data on the exact order and intensity of attention given to page elements before clicking a result. It’s really enlightening. The numbers show the order and the size of the circle shows the intensity (length of time) of the fixation.” Read the rest at Justin Briggs.