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Humans use only 10 percent of their brains

Human brain

A popular saying in films and self-help books. What do brain scans and medicine say?

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Only a small share of neurons fire at any single moment

At a given instant most neurons are not firing, which is sometimes given as support for the saying.

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Not firing at one moment is not the same as being unused

Different tasks use different regions in turn. Over a day practically the whole brain is used, just not all at once.

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Brain imaging shows activity in all parts of the brain

PET and functional MRI scans show that all regions of the brain are active over the course of a day, including during sleep.

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Damage to almost any area of the brain causes some loss of ability

If 90 percent of the brain were unused, injuries to those areas would have no effect. In practice there is almost no area that can be damaged without consequences.

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