HUMAN BRAIN
The human
brain has the same general structure as the brains of
other mammals, but has a more developed cortex than any other. Large
animals such as whales and elephants have larger brains in absolute terms, but
when measured using the encephalization quotient which
compensates for body size, the human brain is almost twice as large as the
brain of the bottlenose dolphin, and
three times as large as the brain of a chimpanzee. Much of the expansion comes from the part of the
brain called the cerebral cortex,
especially the frontal lobes, which are associated
with executive functions such
as self-control, planning, reasoning, and abstract thought. The portion of the cerebral cortex devoted
to vision is also greatly enlarged in humans.
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