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It may very well be we have not discovered neurogenesis occuring in other parts of the brain as well. This process replaced the popular thinking of our time that when a person was born, they were born with all the brain cells they would have for their lifetime. Neurogenesis is a process whereby neural stem cells are produced at the hippocampus and migrate to the subventricular areas of the brain. Most of the new cells die, but many are assembled into the ventricular areas of the brain, establishing new, mature, neural pathways that may be used within the brains central processing system. Then again, there may be some evolutionary reason why it only appears this region of the body actively processes new neural cells. It may have something to do with the fact that this region is responsible for delivering responses to frightening stimuli, the well-known "fight-or-flight" response.
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