Dean recently wrote a post about this and I want to, too. How did this myth start? The idea that humans use only 10% of their brains. The new movie Lucy is based on this premise that normally we use only 10 percent of our brains. Well if that’s true I’m screwed, as are the majority of stroke survivors. I definitely killed way more than 10% percent of my brain when I decided to have a stroke. If I killed some of the 90% of my brain that I wasn’t using then why do I have so many problems? Can anyone answer that? Dean killed a whole lot of his brain in a completely different area than I did and he has issues. No, we use the whole brain. And when some of it is killed off, like for instance when you have a stroke and decide you don’t need some brain matter anymore, other areas of the brain CAN take over for those functions.