Left Hemisphere Dominance in Japanese Sign Language Proven

I assisted Associate Professor Kuniyoshi Sakai of the University of Tokyo with his brain research.
Assoc. Prof. Sakai is capable of communicating in Japanese Sign Language at the beginner's level.
I am glad that Japanese Sign Language has been scientifically proven to be a language.
The paper on the subject is available at the URL below.
http://brain.oupjournals.org/cgi/reprint/awh465v1