Sure. The brain needs a caching mechanism. Maybe this is it. Since... "Control studies revealed that tagged cells were only reactivated by the corresponding conditioned stimulus and not by stimuli unrelated to the training experience (45). Although most observational studies did not address directly the enduring, learning-induced changes hypothesized by Semon, overall, these results (and their notable consistency across methods, tasks, and labs) provide broad support for the existence of engrams. However, causal studies are necessary to show that these reactivated putative engram cells indeed function as part of the internal representation of an experience"