I've found that my weighting is a function of recall. The more often I recall a memory, the more likely I am to continue to remember it, conversely unrecalled

I've found that my weighting is a function of recall. The more often I recall a memory, the more likely I am to continue to remember it, conversely unrecalled memories tend to fade more and in a sense become compressed or move to cold storage which requires more concentration to recall. I've always assumed this was an evolutionary result of weighting memories based on their usefulness, wherein the most useful memories are correlated with their recall frequency. I.e. they are the most useful for surviving my day to day life since I seem to need them a great number of times.