It's one of those "everyone knows..." things which are, as far as I know, entirely untrue.
It may be the case that only a small proportion of the brain appears to be active at any one time, but that doesn't mean that the rest of the grey matter isn't busy contemplating life, the universe and everything.
This is from some misquoted research carried out in the 1920's. Reports of the research claimed we only use 20% of our brainpower most of the time. I read in the New Scientist magazine (I think) that we in fact use all of our brain power all of the time ie. 100%. I am afraid that it it just an urban legend.
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