Erasing
Your Memories
Who hasn’t dreamed of owning the memory eraser from Men in
Black? We all have awkward, embarrassing memories that we wish we could simply
wipe from our minds. For people suffering from Post-Traumatic Stress Disorder
(PTSD), certain traumatic memories are so triggering that they can cause
insomnia, depression and anxiety. The ability to erase those harrowing memories
would greatly improve the lives of people with the disorder, possibly even
curing them altogether. While erasing memories with a flash of light may be
just a little too sci-fi, recent research into the biological mechanisms of
memory offer hope of memory deletion coming in the form of a pill or an
injection..
Memories are not as stable as you might expect. When a
memory is recalled, It can be strengthened, weakened or updated. Think of how
when you see a friend with a new haircut, your visual memory of them is changed
to incorporate it. However, retrieved memories are fragile, in the same way
that putting up a tent without pegs makes it vulnerable to being blown away.
The process of stabilising a memory (hammering in the tent pegs) is called
reconsolidation. If we can prevent reconsolidation from happening, then we can
cause the memory to vanish.
Joseph LeDoux, professor of neuroscience and psychology at
New York University, blocked reconsolidation in rats by injecting an antibiotic
known as anisomycin into the amygdala (the brain region responsible for.storing
certain types of memory). This caused the rats to forget things they had been
previously taught, such as fear of a stimulus. Although anisomycin is toxic to
humans, other studies have suggested that beta-blockers may produce similar
results in the human brain. All signs suggest that memory deletion won’t be
confined to science fiction for much longer.
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