Amnesia is a condition in which memory is disturbed or lost. Memory
in this context refers either to stored memories or to the process
of committing something to memory. The causes of amnesia have
traditionally been divided into the "organic" or the "functional."
Organic causes may include brain damage through injury, or the use
of specific drugs - usually sedative drugs. Amnesia may be one of
the symptoms of some degenerative brain diseases, such as
Alzheimer's disease. Functional causes are psychological factors,
such as defense mechanisms. People with amnesia also find it hard
to imagine the future, because our constructions of future
scenarios are closely linked to our recollections of past
experiences. Researchers from Washington University in St. Louis
used advanced brain imaging techniques to show that remembering the
past and envisioning the future may go hand-in-hand, with each
process sparking strikingly similar patterns of activity within
precisely the same broad network of broad region.
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