We used to believe that we were born with all of the new brain cells we would have for life. Once we reached adulthood, we can’t learn any more new tricks. Actually it’s not quite that way, but in general neural stem cells (undifferentiated brain cells, like fetal brain cells) were thought to only exist in fetal or neonatal brain. This is why brain injury to an adult has such a devastating affect.
But, new research conducted by Fred Gage PhD of the Salk Institute shows that neural stem cells exist in the adult brain and they can multiply, differentiate and join the rest of the mature brain cells. This process, called neurogenesis (think nerve beginning or nerve birth) can happen throughout our lives.
Aging slows neurogenesis, but Dr. Gage has also found that physical activity enhances the process. Chronic stress suppresses neurogenesis temporarily, possibly for months.
These findings have tremendous implications for finding ways to promote growth of damaged brain and spinal cord cells.
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