Right brain vs Left brain and CT

Do you perhaps mean to refer to Dario Nardi's study on neuroscience? In that case I don't think you're entirely mistaken; for example the Fp1, T3, T5 and P3 regions in the left hemisphere of the brain have been observed to be used more frequently by Je-leads relative to the other types. Have you seen this or this? It's a reasonable speculation because Ctypes deal with neuroscience, therefore logically there should be correlations. However I don't think being J/P-lead necessarily means you will have a certain hemisphere dominance, that per se doesn't mean that J/P-leads can't have a natural inclination towards one hemisphere. 

Here are some tests I found relating the topic. 


www.heraldsun.com.au/news/right-brain-v-left-brain/story-e6frf7jo-1111114603615
Uncertain of its accuracy. Although according to wikipedia, which references an online survey done regarding this test, 2/3 of the test subjects perceived the silhouette to be rotating clockwise (right brain).
www.wherecreativitygoestoschool.com/vancouver/left_right/rb_test.htm
This is a multiple choice test. Again uncertain of its accuracy.

There's also a simple one where you interlock the fingers of your hands and place one thumb on top of the other, like this.  (This too is uncertain).



The idea is that people who place their right thumb on their left thumb tend to be left-brain dominant and vice versa. 

I scored right-brain on the spinning lady and the thumb test, left on the multiple choice.

I'm P lead too, and i put my right thumb over the left.

Weird.

I place my right thumb over my left, indicating left brain dominance.

However, I see the spinning lady turning clockwise, indicating right brain dominance.

Not sure I put much weight into the whole thing, altogether, anyway.

well the test gave me right brain over left but i don't trust online tests
i see clock wise in the image
and my psych prof actually had us do that hand test in class and i was left thumb over right. she didn't really say what the test was for at the time though.

I was typed NeFi. I put my left thumb on top and test right brained on the spinning girl test. It was tricky but I did get her to switch directions once. But... I grew up with 2 left handed parents (the thumb thing could be learned with all the church going I did when young. haha) and I am right-handed/ left eye dominant (cross-dominance). I usually score balanced or slightly right-brained on the multiple choice tests (I didn't take the test that was linked).

I remember Lenore Thomson touched on MBTI Brain types. Ne,Se,Ti,Fi were right brained functions. Te,Fe,Si,Ni were left brained functions.

I also had different results between the spinning girl and the hands. I saw the girl spinning counter-clockwise, although I could change her direction fairly easily once I got the trick to it (scroll down until you can only see her feet, than you should be able to change the direction with ease), but I put my left thumb on top of my right. I think I'm left-brained, from the descriptions, but am unsure.