CORRECTION TO MY PREVIOUS POST....
Perhaps he experiences synesthesia (read: having synesthetic perceptions). What do you think?
But doesn't synesthesia usually come in the form of either seeing numbers or letters in color, or seeing colors due to being on some sort of hallucinogenic drugs. I also thought that the natural condition was usually pretty consistent.
When I initially watched the video I took him as basically trying to say that he is in an extreme zone during his playing (When your brain starts to perceive things are slower than their actual rate). Like Being in the Matrix (sorry could not resist)
But, when he actually said that he sees colors from time to time I started thinking...hmmm.
But thanks again j_kay for the video clip, and I will go off and educate myself.