I know a lot of high-IQ people who lack in sensitivity or other useful qualities. I also don't feel cool talking about IQ, but I've wondered about some connections to nervous system operation.
As for working with a therapist, I've been creeped out by extremely bright people and I've felt very comfortable around others who were extremely bright. So IQ isn't really it for me. Maybe more like ability to think globally and form new questions matters more (though this often accompanies high intelligence)....vs making quick decisions or judgments. I've had therapists who were certainly bright but couldn't just be okay wondering about something that was really murky or unclear...it was always more about diagnosing every behavior or fitting it into some model that fit their own experience. They felt they always had to have an answer and it didn't feel helpful to me.
And like others have said, sensitivity and empathy are pretty important! My current therapist "reads" me better...vs seeming to be informed by preconceived or bookish knowledge and fitting me into what she knows. I don't really trust the genius who looks like nobody is home and talks like Charlie Brown's teacher.
As for trauma connection to IQ, probably PTSD just increases existing sensitivity and/or isolation (though I don't high IQ always relates to sensitivity). if there is any correlation, I've wondered some about Dabrowski's theory of "over-excitabilities". My good and bad hyper energy all feeds into each other....or I over-compensate for bad energy with extreme levels of distraction. I'm almost always on some sort of adrenaline high I can't get off of. Anyway, Dabrowski thinks of giftedness as being particularly a nervous system sensitivity, or excitability. We can have different excitabilities, or all of them to some degree (psychomotor, intellectual, emotional, sensual...). I related a lot to studying his stuff because I've always felt WIRED. Hyper-sensitive, taking in too much info from my environment. I notice too much, I think too much, I talk too fast, I move too much, etc. It has helped to have a therapist who respects a certain degree of this without asking me if I might have ADHD...or WHAT my problem is....:alien::alien::alien::alien::alien:
I wouldn't know if it's connected to my trauma, but my major trauma was very very early in life and I also grew up in an unpredictable, sometimes terrorizing, environment...and probably because hyper-alert to changes. Also, my thoughts were always fast and either all over the place or hyper-focused, sometimes out of sheer curiosity, other times as a need to distract myself. So, in some part there might be some nervous system and behavioral adaptation. But honestly, the only research I've seen points to potential for lower cognition in children who are traumatized. When very young I struggled a lot and needed extra tutoring. Though I don't think I was dumb....just very disorganized in my head. I think my adaptations to the world helped me do really well in school eventually. And certainly sensitivity counts for something, whether inherent or somewhat related to the overly reactive nervous system (I really suspect both).