Funny, I was thinking about this this very morning.
Left on top
Right Handed 99% *
Left Brained
Male
*The right side of my body is very clearly dominant but there are a couple of things that I do better with the left: fastening sleeve buttons and high jump (erm, 26 years ago, I haven’t tried since).
Some combination of genetics and random chance. I don’t know if anyone has done a study of how very young children fold their hands (I certainly wouldn’t prioritize that field), but I’d hypothesize they have a much weaker preference, and that one version becomes dominant over time.
Right finger on top.
Cross-dominant. Dexterous hand is the right, strong hand is the left.
Female.
Neither-brain dominant. My perceptions are highly visual, I sometimes say that my first language is not Spanish but pictures. But my expression has eventually and of necessity become highly verbal.
Legs get crossed either way. Right now my ankles are crossed pointing back and the right is on top, but they’ll eventually flip. Arms get crossed left-outside, but I hug myself left-inside.
Note that there’s studies which show that (in general, etc. etc., rest of the disclaimer), women tend to be less brain-lateralized than men. That an engineer who spends a lot of time training people needs to balance both sides shouldn’t be a surprise either.
I’m comfortable clasping my hands either way; I tried it several times each way to make sure, and neither feels more “right” than the other. Right-handed, female, do not believe in the left brain / right brain thing at all.
Right with a big *
Right
Male
Rightish brained from the silly tests once upon a time.
I cross my ankles both ways. My right arm goes on top when I cross my arms.
When I clasp my hands I mostly don’t interlock my fingers. It’s one fist wrapped by the other hand. When I do interlock usually my index fingers, thumbs, or both are extended and meet with the pads centered on each other. That’s still right middle finger on top, though.
Male
Clasping hands, the index finger on the left hand goes on top. Feels unnatural the other way.
Folding arms. The right hand goes over the left arm and the left hand is tucked under the right.
Crossing legs. The right leg goes over the top.
I am now mostly right handed but I grew up at a time when my tendency was to be left handed but we were highly encouraged to be right handed. So I am a little confused in that area. Eating, my left hand is always to dominate one. Write with the right. Use of both hands are mostly equal in other circumstances.