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An engram is a memory trace, one possible explanation for the persistence of memory. Fundamentally, an engram is posited to be a physical, biochemical change in the brain (and other neural tissue) in response to external stimuli, thus forming a memory.
Karl Lashley coined the term and did extensive, yet unsuccessful research to localize engrams in the 1920s.
Engrams are a central concept in L. Ron Hubbard's Dianetics psychoanalysis techniques and the associated religion of Scientology.
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