I remember watching a short video online of a man who shared an interesting theory. It was a long time ago and I can't find it... so sorry I can't link you to it.
He explained that one difference in external behavior between N people (Intuitives) and S people (Sensors) is their eye movement:
-- In conversation, those with S preferences tend to look straight at you or don't move their eyes around that much; they're more in tune with their external senses and focus their vision as well as their thoughts in a more straightforward way.
-- On the other hand, he said those with N preferences tend to shift their eyes around a lot while they talk. He said that this frequent eye movement exhibits all the mental connections that the N person is making, as if the eyes are searching through the brain over and over during the conversation.
I thought this was a cool idea. Speaking from personal experience, the Sensors that I know totally do that! And as an N person myself (INTP), I move my eyes around a LOT. When I speak to a Sensor it has made me feel weird sometimes at the direct way they look into my eyes, not just because I'm introverted, but this theory really makes me wonder. My eye contact is consistently on and off, mostly off and wandering everywhere as I'm thinking, then on again to maintain social etiquette. I didn't really think of it consciously until I came across this video, and also someone I know has commented to me about how I move my eyes around so much when I talk.
Certainly this is just a theory and your eye contact is contingent on the situation. If I am talking to someone, the main reason I often look away as I figure out my words is because it helps me concentrate. Of course everyone does that, but maybe Sensors have LESS eye movement overall and Intuitives MORE?
Eye contact is influenced by level of comfort or uncertainty, but let's speculate on how typology could play into it. This information could contribute to our knowledge about behavioral nuances according to type.
What do you think about this? Can you relate?