Medical Definition of long–term memory
: memory that involves the storage and recall of information over a long period of time (as days, weeks, or years) A short-term memory's conversion to a long-term memory requires changes within the brain that protect the memory from interference from competing stimuli or disruption from injury or disease.—Alison Preston, Scientific American, December 2007 But the mystery remains: how do cells in the cortex physically lay down long-term memories?—Sandra Blakeslee, The New York Times, 14 Nov. 2000—abbreviation LTM; compare short-term memory
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