"... several important areas of the brain continue to create neurons throughout
life, a process called adult neurogenesis. In recent years, Gould has
investigated factors that influence the rate of adult neurogenesis and the roles
played by the new brain cells. ... recent studies examined neurogenesis in a
part of the brain called the hippocampus, which is involved in learning and
memory as well as in responding to stress. Previous studies had shown that
stress can significantly reduce neurogenesis."