Interestingly arm/body position in writing tends to be representative of actual hemispheric dominance in language use. In that a "normal position" represents language in the opposite hemisphere from the writing hand; whereas the hooked arm position tends to represent language in the same hemisphere as the writing hand. Mis-modeling could be a factor too.
This is what I've heard as well. I'm a lefty that writes without a hook (not corrected- just never hooked at all). My mother found some literature and shared it with me as a teen that suggested this meant language for me was in my right hemisphere.
