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Do I only use 10% of my brain?You may have heard someone say we only use 10% of our brains. But it turns out this often repeated 'fact' isn't true.As Dr Barry L Beyerstein points out in the book Mind Myths, if 90% of the brain is unused, it should be possible to damage large parts of someone’s brain without affecting their behaviour. However, there is essentially no part of the brain that can be damaged without corresponding changes in behaviour. Scientists know this from studying stroke patients and people with head wounds. Another reason scientists doubt the 10% claim is that brains scans show activity across our brains, even when we're sleeping. Finally, ponder this question: why would the human brain, an organ that requires a lot of the body's resources to function, evolve over millions of years and wind up being so inefficient?