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The cortex and the cerebrum make up the neocortex. The word cortex means bark. It is the thin outer layer that covers the cerebrum. The cortex is wrinkled into thousands of tiny folds which evolved to help pack the maximum number of brain cells into the limited space available. (The brains of lower animals are smooth or have far fewer folds.) The cortex and the cerebrum are generally thought of as a single working unit.
The cerebrum makes up 80 percent of the brain's mass. Together with the cortex that covers it, it is responsible for all the active thought and planning that goes on in the brain. The cerebrum and cortex make possible thoughts like these. "That project I did in art class today needs something, but I can't figure out what." "I like that song playing right now." "I've got to convince the teacher that paper was worth a higher grade. Wonder what I should say."
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