One brain and different lives

What if you only use 18% of your brain because the other parts of your brain are from previous lives? So when you hear about some people with brain injuries who can suddenly play an instrument or speak another language, that person is just accessing the other parts of past lives.

Here's a cool concept: You live five completely different lives and have to do them well before the final release of your soul.

Here's another cool concept: The brain is compartmentalized into five sections of memory and thought, and somehow the different lives of one brain come together to make one person in five, a person using one hundred percent of the brain. A new superhero.