As you already control more than 10 percent of your brain nothing significantly different would happen.
Magic would happen.
Lefty's would rule the earth.
Your brain would get damaged and you would die.
We would be able to control things with our mind and basically know everything. (If you don't believe me, then its still true)
Voluntary movements and complex decision-making would be controlled primarily by the cerebrum, which is the largest part of the brain responsible for higher brain functions such as reasoning, problem-solving, and emotion regulation.
died
Yes
You would be named Brayden or Elliott
You would suffocate, have brain damage, and die.
You would instantly die.
Being alive would be sufficient to use 100% of your brain, however you don't nor would you want to use 90% of your brain at once.
The Brain Wouldn't Tell The Heart To Beat So You'd Die.