This is taught in graphic design, how people typically scan information from left to right and top to bottom, in cultures where the written language flows in that direction. However, a counter argument could be made that people perceive paintings differently from the way they read written text. There have been studies about how the Japanese perceive images and sounds with the same area of the brain that processes language, in contrast to other cultures where they're processed separately. [citaion needed]

Look up “spatial agency bias” and “glance curve”

Doesn't strike me as particularly true either.