Some time ago I saw a bunch of photos on someone else's Mac, I think it was in Lightroom, and he had an overlay which basically showed what your eyes were drawn to. Somehow it found in the colours how your eyes travelled throughout the photo, and showed you that path - I hope that makes sense. On every photo is was (of course) different, and it wasn't 100% correct, but it was obviously based on averages, and showed the editor what the general audience would look to first, and how their eyes would wander throughout the photo... Awesome.
Unfortunately I can't for the life of me find that functionality in Lightroom or Photoshop, and think it may have been a tool added to Adobe.
Does anyone in here know of such an overlay?