Hello friend @lanzjoseg
The brain, an excellent and difficult subject hehehe I think in medicine is one of the most complex parts to study, but you are very right when you talk about its importance and everything the brain does to make our life what it is. It's awesome! But the percentage of the brain used is 100% we use it all, just some have more neural connections than others.
Dear @franyeligonzalez
In medicine and in everything hehehe I think it is really something very complex to explain and from a philosophical point of view it is usually more difficult.