Think you use just 10 percent of your brain? That's a myth

Reading this, you're probably using, what ... 10 percent of your brain? Funny how that notion took hold—that we use a tenth of our brain at any given time—because there's no actual evidence for it, FoxNews reports.

The idea may date back to psychologist William James, who wrote in 1907 that we use "only a small part of our possible mental and physical resources," and a foreword to Dale Carnegie's How to Win Friends and Influence People that loosely quoted James as saying that "the average person develops only 10 percent of his latent mental ability." Now, products exist to "unlock the other 90 percent" and a new thriller, Lucy, shows Scarlett Johansson taking drugs that enable her to use all 100 percent of her brain.

But, as the Atlantic reports, scientists point out that the brain is an organ packed with living neurons that are always up to something. Brain scans that show only a small active portion of gray matter "lighting up" may confuse people, one neuroscience professor points out, because they show only the brain's major activities, not all of them.

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