It is a false myth originated in the statement of the American writer and psychologist William James, in which we use only a small part of our mental and physical resources.
In fact, although during some moments of the day (for example, when the rest), the active brain areas are in the minority, within 24 hours to any part of the brain into action.
Even during sleep even "fan" frontal cortex regions as that is the region responsible for decision making, or somatondjesore areas that allow us to perceive the surrounding environment.
That is a baseless myth becomes apparent if we analyze the functioning of the brain.
That example, though occupies only 3% of body weight, uses a full 20% of the energy that enters the food, to feed the electrical activity of neurons.
By pikapamja of evolution, natural selection has definitely happened to eliminate 90% of gray matter that is not used.
Even experimental evidence refute the myth: neurophysiological techniques that allow to measure the electrical activity of neurons, not never seen an area with so many stretch inactive.
Report 10 90 is in fact a sense if considered brain structure, which is composed in 90% of the yellow cells, whose function is to nurture, support and protect the neurons, but that does not interfere with cognitive processes.
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