what percentage of the brain does the average human use?
This is a very difficult question to address. Your brain is functioning at
so many levels at any given time that to access exactly what parts and how
much is being used is not feasible. In addition, many of the cells of the
brain are for protective purposes and not related to function of the
nervous system. This is why some people claim that the brain uses only a
fraction of its mass when in fact the parts not being used are not designed
to be used.
I haven't answered your question, but I do not think anyone can really.
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Update: June 2012