[tongzilla]

I find a very big visual difference in what the eyes perceive when the head is swaying versus the head turning. Most have the ability to move their eyes in the sockets...like this: If your eyes stayed fixed in the sockets, I could see that it would be hard to differentiate. I know your eyes do not.

I can focus my eyes on the tiny power light on my computer monitor and turn my head. As I turn my head, my eyes stay focused on the light. So, my eyes turn to the left as my head turns to the right.

Sorry, I think I understand what you're getting at, but...The eyes needs to move in their sockets regardless of whether your head is turning or swaying if you want to look at the same spot. In your above example about focusing the eyes on the light of your computer, the eyes have to turn left (albeit different amounts) whether your head sways or turns. Actually, the amount of eye movement needed when you turn you head is less compared to swaying.

When swaying, even the smallest amount, I notice the sway. There is a visual difference.

I'm sure you know when you sway your head, but I'm just a little skeptical that it's because you can sense how much your eyes have moved in their sockes.