Now that we have studied the brain, its parts, functions, and which side you THINK is more dominant, lets discuss what percentage of your brain you actually use on a day to day basis.  Most think it is 10%.  Is this fact or fiction?  Watch this video and you make your decision. Two thirds of the population believes a myth that has been propagated for over a century: that we use only 10% of our brains. Hardly! Our neuron-dense brains have evolved to use the least amount of energy while carrying the most information possible -- a feat that requires the entire brain.