Unfortunately, this way of learning new data is rarely possible in the real world except in
the most artificial situations. It is in essence impossible to explicitly store all, or even a small
fraction of previous training exemplars for future learning. True, one could argue that they
are “stored” in the environment around us. My internal representation for, say, “car” or
“child” is constantly being interleaved with any new input that I learn since these exemplars
are continually available in the environment. But “my grandfather’s kitchen table” is not. It
is an object — a perfectly ordinary handmade wooden table — that I have not seen in twenty
years, but that I nonetheless still remember with vivid clarity. Since I have seen literally
thousands of tables (and all manner of other objects) since that time and if interleaved pattern
presentation were necessary to avoid forgetting, then I should have a great deal of trouble
remembering his kitchen table. Why has this memory remained intact in the absence of any
interleaved (real) input from the environment? I suggest that an internal approximation of
the original pattern is generated in long-term memory and it is this approximation that, in the
absence of the real pattern-in-the-environment, serves to continually reinforce the long-term
memory trace of the original pattern.
Unfortunately, this way of learning new data is rarely possible in the real world except inthe most artificial situations. It is in essence impossible to explicitly store all, or even a smallfraction of previous training exemplars for future learning. True, one could argue that theyare “stored” in the environment around us. My internal representation for, say, “car” or“child” is constantly being interleaved with any new input that I learn since these exemplarsare continually available in the environment. But “my grandfather’s kitchen table” is not. Itis an object — a perfectly ordinary handmade wooden table — that I have not seen in twentyyears, but that I nonetheless still remember with vivid clarity. Since I have seen literallythousands of tables (and all manner of other objects) since that time and if interleaved patternpresentation were necessary to avoid forgetting, then I should have a great deal of troubleremembering his kitchen table. Why has this memory remained intact in the absence of anyinterleaved (real) input from the environment? I suggest that an internal approximation ofthe original pattern is generated in long-term memory and it is this approximation that, in theabsence of the real pattern-in-the-environment, serves to continually reinforce the long-termmemory trace of the original pattern.
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