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The prefrontal cortex of the frontal lobes of the brain are removed or deprived of blood in a "lobotomy" (leucotomy) a once widely-used form of psychosurgery on violent mentally-ill patients. Because the lobe is the major center of voluntary action, a lobotomy can render a person incapable of intellectual thought. Many are reduced to the level of idiocy, able only to do the simplest activities.

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12y ago

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