(I) The brain is very good at warning us for threats, and it
is also skillful at letting us know when a threat no longer
exists. (II) However, sometimes this system fails, and
unpleasant associations stick around leading to a
malfunction thought to be at the root of post-traumatic
stress disorder. (III) New research has identified a
neuronal circuit responsible for the brain's ability to get
rid of bad memories. (IV) The hunt to find medication
that can slow or halt the progression of Alzheimer's
disease is on. (V) This finding could have implications
for treating a broad range of anxiety disorders including
post-traumatic stress disorder