What is significant about cephalization?

Cephalization is the formation of a central nervous system in organisms. In most cases, this involves a brain and a spinal cord, with a system of nerves attached to this central system. Cephalization is important in that it allows for the organism to make quick movements. It also allows for the organism to have an axis of symmetry, further making quick movements possible as the organism can either find prey or avoid being prey.
Cephalization allows for an organism to have a brain. The brain allows for thought in humans and also allows for other organisms to be smaller and have more efficient nervous systems. Stimuli can affect a nerve ending and travel to the brain where the brain can make a decision. When you put your hand on a hot stove, all of this happens in a matter of less than a second.