BMJの過去の記事から。出典を忘れないようにコピペしておく。最近、脳神経科学をやっている人々が「あれはデマだ」と言うのをよく聞くようになったが、この記事にもあるように、たしかにエビデンスはまったくないらしい。たしか『北斗の拳』でそんな風に書いていて、幼な心に衝撃を受けた気がするなあ。『魁!!男塾』に書いてあったら信じなかっただろうけど。
We use only 10% of our brains
The belief that we use only 10% of our brains has persisted for over a century, despite dramatic advances in neuroscience. In another extensive expert literature review, Barry Beyerstein provides a detailed account of the origins of this myth and the evidence disputing it. Some sources attribute this claim to Albert Einstein, but no such reference or statement by Einstein has ever been recorded. This myth arose as early as 1907, propagated by multiple sources advocating the power of self improvement and tapping into each person’s unrealised latent abilities.
Evidence from studies of brain damage, brain imaging, localisation of function, microstructural analysis, and metabolic studies show that people use much more than 10% of their brains. Studies of patients with brain injury suggest that damage to almost any area of the brain has specific and lasting effects on mental, vegetative, and behavioural capabilities. Numerous types of brain imaging studies show that no area of the brain is completely silent or inactive. The many functions of the brain are highly localised, with different tasks allocated to different anatomical regions. Detailed probing of the brain has failed to identify the "non-functioning" 90%. Even micro-level localisation, isolating the response of single neurones, reveals no gaps or inactive areas. Metabolic studies, tracking differential rates of cellular metabolism within the brain, reveal no dormant areas.
Rachel C Vreeman and Aaron E Carroll, `Medical myths', BMJ 2007;335:1288-1289 (22 December)
あれ、「Hair and fingernails continue to grow after death」これも神話なのか。脳死の議論でしょっちゅう出てくるんだけどな。そのうち指摘することにしよう。
