do you have issues with eye contact?
In my experience, I tend to look down or to the side if spoken to. People occasionally mistake this for indifference but I do this because I find it easier to focus on and process what is being said. That doesn't mean I'm incapable of eye contact like an autistic--I can be very intense and focused on others' eyes, especially if I am engaged in a really interesting discussion or speaking to one of my "inner circle" (i.e. people I give a shit about).
I've also noticed that when I look people in the eyes, I sometimes have an intimidating effect on them (this is usually unintended, but sometimes it can work to my advantage if someone is hassling me). People will say I look pissed off/angry when I am not. One guy even once told me that he was certain I looked like I was about to kick his ass. This came especially as a surprise to me, because I am a pretty peaceful person--perhaps this is partly why I have been able to avoid any major fights throughout my life.
I think I may do this as a way of preemptively "disarming" myself so as to put others at ease around me.
Anyway, I think part of the reason I avoid eye contact is, along with the first reason I gave, that people too often misread me based on my eyes.
Any thoughts from other ISTPs (or people who know ISTPs)?
I might also add that people have often criticized me for not blinking enough.