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The term neurogenesis refers to the creation of new neurons. (LeDoux, Joseph.Synaptic Self. p 66-68. NY: Penguin Books, 2002.)

Neurogenesis increases our understanding of neuroplasticity, the brain's ability to reshape itself. Every day the brain has been found to generate 10,000 stem cells that split into two: one becomes a line that continues to make stem cells; the other goes to wherever it is needed in teh brain and becomes the type of cell that is needed. (Source)

In the first month after conception, the human brain begins to develop. Approximately 250,000 neurons are generated each minute, so within six months most of the billions of neurons have been created. Shortly after their creation, neurons become differentiated, assume specialized roles, migrate to their assigned position, and form synapses so they can store information and communicate with each other. (Schramm, Derek D., PhD. The Creative Brain. p 2. CA: Institute for Natural Resources, Health Update. 2007.)

Because of its plasticity throughout life, the brain can rewire itself in response to new learning, and can even create new cells (neurogenesis) under specific circumstances. (On the Brain, newsletter. p 2-3. CA: 2005.)

Research 1998, Eriksson: in adulthood the brain can grow new neurons, at least in the hippocampus. (Jensen, Eric. Brain-Based Learning (Revised). p 28. CA: The Brain Store, 2005.)