This is the research on the Gutenburg Diagram and the Rule of Thirds.

1. Gutenberg Diagram:
It is the general pattern that the eye will
follow when looking at a page. It shows
that the page split into quarters and each
quarter has a specific function that will
attract the eye.
Rule of thirds:
It is a 3x3 guideline that appears when a
piece of film or photography is split to be
cropped. It would be easier to imagine the
photo or film being split into 9 parts,
horizontally and vertically. When the image
will be viewed, the eye is usually attracted
to the top left of the image but the rule of
thirds goes from the middle outwards.