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It is understood from the passage that the hippocampus ----.
It might sound like something from a modern-day
vampire movie, but transfer of youthful blood can have a
reviving effect on the mind, researchers have found. Or
at least, it can in mice: a study by Stanford University
School of Medicine has discovered that something in
the blood of young mice has the ability to restore mental
capabilities in older mice. Over the course of three
weeks, the scientists gave 18-month-old mice eight
infusions of plasma taken from animals that were just
three months old, and then put them through a set of
experiments to test their spatial memory – memory
relating to the position of things and how large or small
they are. The mice were seen to perform consistently
better in the tests after receiving the young blood. Old
mice injected with the blood of other old mice, on the
other hand, showed no improvement in the tests. The
team found that new connections were also formed in
the old mice's hippocampi, which again were not seen
in the control group. The hippocampus is a brain
region that plays a huge role in memory, particularly in
recognising and recalling spatial patterns. It is very
sensitive to ageing, showing a natural decline in function
as people grow older. In conditions such as Alzheimer's
disease, this deterioration is accelerated, leading to an
inability to form new memories. It is as yet unclear
whether transferring young blood into older individuals
would have the same effect in humans