Philosophy
The Epistemology of Memory and the Justification of Recalled Beliefs
Quick fact
Philosophical preservationism holds that memory does not generate new justification but merely preserves the justification a belief had when it was first formed, even if you can no longer recall the original evidence.
Why this is interesting
You trust your memories every day, but what if the reasons you originally had for a belief are long forgotten—can that belief still be justified?
Read the full explanation
Understanding The Epistemology of Memory and the Justification of Recalled Beliefs
We often think of memory as a filing cabinet that stores past facts and experiences. But epistemologists ask a deeper question: when you remember something, what makes that belief justified? Imagine you learned that the capital of Peru is Lima from a reliable atlas years ago. Now, you simply remember it, but you can't recall the atlas or the moment of learning. Is your belief still justified? This is the central puzzle. The answer depends on how we conceive of memory's role. One view, preservationism, says that memory is like a photocopier: it doesn't create new information, it just copies what was already there. So if the original belief was justified, the memory preserves that justification. The opposite view, generationism, says memory actively constructs beliefs, and these new beliefs need their own justification, just like beliefs from perception. This matters because memory is not a passive recorder; it is reconstructive—each recall can change the memory, blending in new details or distorting the original. So, if memory can alter the content, can it still transmit justification?
A deeper explanation
The key mechanism at work is the distinction between the origin of a belief and its current status. A belief formed in the past (e.g., through perception or testimony) had some justification at that time. If you later recall that belief, a preservationist argues that the justification is retained—it doesn't matter that you've forgotten the original reasons. This view relies on the idea that memory is a preserver of epistemic status, not a new source. Philosophers like Thomas Reid and, more recently, Michael Huemer have defended this. On the other hand, generationists like Jennifer Lackey argue that memory can create new beliefs (e.g., you suddenly remember something you never explicitly formed as a belief before). In that case, those beliefs need fresh justification, perhaps from the reliability of your memory faculty itself. This leads to externalism: if your memory is generally reliable, then beliefs arising from it are justified, even if you don't know that it's reliable. Internists, however, demand that you have some access to the reasons for your belief. The problem of forgotten evidence is a powerful test case. Suppose you once had strong scientific evidence for a theory, but now you only remember the conclusion. Does your belief remain justified? Preservationism says yes, because the original evidence remains part of the belief's history. This seems counterintuitive to some, but it aligns with our everyday practice—we accept justified memories without keeping receipts. Ultimately, the epistemology of memory forces us to decide whether justification is a property that can survive the loss of its original grounds, or whether it must be continuously supported by accessible reasons.