"Every perception is to some degree an act of creation, and every act of memory is to some degree an act of imagination."
-- Gerald Edelman, Second Nature: Brain Science and Human Knowledge
2 On the role of cognitive science in the design of systems to augment cognition4 On the role of cognitive science in the design of systems to augment cognitionOn the role of cognitive science in the design of systems to augment cognitionPart II: Personal Memory Systems More BroadlyAugmenting Long-term Memory2020-09-24Journal
we learn to swim during the winter and to skate during the summer.
In fact, exactly such an effect was experimentally verified in an 1895 study of Axel Oehrn\\ Axel Oehrn, Experimentelle Studien zur Individualpsychologie (1895).. While subsequent experiments have confirmed this result, it depends sensitively on the type of material being memorized, on the exact time intervals, and many other variables. Now, in some sense this contradicts the Ebbinghaus exponential forgetting curve. In practice, a pretty good heuristic is that the Ebbinghaus curve holds approximately, but there are exceptions, usually over limited times, and for very specific types of materials.