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How long until this paper is forgotten? Collective forgetting is the processby which the attention received by cultural pieces decays as time passes.Recent work modeled this decay as the result of two different processes, onelinked to communicative memory --memories sustained by human communication--and cultural memory --memories sustained by the physical recording of content.Yet, little is known on how the collective forgetting dynamic changes overtime. Are older cultural pieces forgotten at a lower rate than newer ones?Here, we study the temporal changes of collective memory and attention byfocusing on two knowledge communities: inventors and physicists. We use data onpatents from the United States Patent and Trademark Office (USPTO) and physicspapers published in the American Physical Society (APS) to quantify howcollective forgetting has changed over time. The model enables us todistinguish between two branches of forgetting. One branch is short-lived,going directly from communicative memory to oblivion. The other one islong-lived going from communicative to cultural memory and then to oblivion.The data analysis shows an increasing forgetting rate for both communities asthe information grows. Furthermore, these knowledge communities seem to beincreasing their selectivity at storing valuable cultural pieces in theircultural memory. These findings provide empirical confirmation on theforgetting as an annulment hypothesis and show that knowledge communities caneffectively slow down the rising of collective forgetting at improving theircultural selectivity.

The rising of collective forgetting and cultural selectivity in inventors and physicists communities