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This paper, by Erickson and company, is looking for ways to prevent or reverse cognitive decline as people age. The hippocampus is part of the brain critical to the formation of memory, something we’ve known from many unfortunate people like Henry Molaison (known in the scientific literature as HM) or Clive Wearing who have suffered damage to their hippocampi. There’s good evidence that the size of the hippocampus can be affected by experience in humans.
