How many neurons are in the human brain7/23/2023 The question of whether and how new neurons are born in adults is important for understanding how our brains adapt to changing life circumstances and how we might be able to repair brain injury. Our research findings sparked healthy debate because for about 20 years, brain scientists have thought that neurons continue to be born in the adult human hippocampus. The birth of new neurons in human memory circuits, in other words, declines during childhood to undetectable levels in the adult. But repeated and varied experiments convinced us our conclusions were correct: New brain cells don’t grow (or are extremely rare) in the adult human hippocampus, a region important for learning and memory. After all, we ourselves remained skeptical of what we were seeing throughout our investigation. When our recent study met significant skepticism, we weren’t surprised.
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