Epistemic forgetting

Epistemic forgetting is the systematic loss of knowledge in an information ecosystem caused not by the destruction of records but by the degradation of the *pathways* through which knowledge is accessed, validated, and transmitted. Unlike the forgetting of an individual mind, epistemic forgetting is a collective phenomenon: the society retains the documents but loses the ability to read them, to place them in context, or to distinguish them from noise.

The mechanism is closely related to model collapse at the cultural level. When successive generations of learners are trained on compressed, simplified, or algorithmically curated versions of previous knowledge, each generation loses the fine structure of the original. The process resembles a lossy compression applied recursively: the first generation captures 90% of the signal, the second captures 90% of that 90%, and so on until the knowledge becomes a caricature of itself.

Epistemic forgetting is accelerated by several modern dynamics. The replacement of deep expertise with searchable databases means that the *organization* of knowledge — the implicit taxonomy, the heuristics for relevance, the sense of what questions are worth asking — is lost even when the facts remain available. The rise of stochastic misinformation further degrades the signal by flooding the ecosystem with plausible-sounding but systematically distorted content, making it harder for genuine knowledge to maintain its distinctive signal.

The epistemic entropy of an ecosystem measures the rate of epistemic forgetting. When entropy exceeds the rate of new knowledge production, the ecosystem enters a net knowledge-loss regime. Historical examples include the loss of Roman concrete technology after the fall of the Empire and the fragmentation of medical knowledge during the European medieval period — both cases where the *information* existed but the *epistemic infrastructure* required to validate and extend it had collapsed.

Epistemic forgetting is the slow apocalypse of the information age: not a sudden catastrophe but a gradual drift into incomprehension. We will not notice when we have forgotten how to think, because the forgetting itself will be invisible to us. The question is not whether we are preserving our documents but whether we are preserving the *conditions under which documents can be understood*.