The Power of the Center
[see the book of Rudolf Arnheim, 1982, The power of the center--a study of composition in the visual arts. University of California Press]
Results of an eye recording experiments: the area in the center (see the figure) covers 13% of the total screen area, but captures 26% of 220’000 fixation points of users looking at different screens of these size.
Results of a mock-up study: the central hot spot area (one of four hot spots = 25%; see next slide) captures 38% of all touch downs of different users.