I thought most people were aware by now that the supposed left brain-right brain split was a laughably simplistic, almost cartoonish oversimplification of highly complex brain activity which now has to go the way of the 'fact' that we only use 10% of our brains, i.e. straight into the bin.
You still here this nonsense about 10% of the brain being used.
I watched again the brilliant two episodes of The Brain by David Eagleman, and you can see that all of the brain is in use.
One little thing that I found counter intuitive was that we react quicker to an audible signal, than a visible one. I thought it would be the other way, but as he explained, it's just down to physics. The part of the brain that deals with sight is very complex, so any signal going that way, just has more brain connections to get through, before 'you' are aware of it.
This was then demonstrated by runners on the starting block being triggered by sound or sight. Sound won.
https://www.youtube.com/watch?v=3MSw2irv0-A