For a very long time it has been the dominant view that neuron cells in the brain do not regenerate after a person is born, that we are born with a constant number of cells and then gradually lose them.

Neurogenesis is the belief that the brain re-generates cells well into adulthood. The neurogenesis research was carried out by professor Gould and professor Fernando Nottebohm.

Neurogenesis research can help doctors treat patients with Parkinson's disease and Alzheimer's.

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