Abstract

You tell your friend about a strange event you witnessed. Your friend presses you: how do you know it really happened? It’s natural to answer that you saw it happen. But that can’t be the full story of how you know. Past seeing, by itself, does not entirely explain present knowing or reasonable believing. When our past learning matters for what we can be confident of in the present, something connects the two. That something seems to be memory. Memory plays some role in our everyday believing, and upon closer inspection that role appears essential. Yet memory is secretive, always operating, almost always without our noticing, and often eluding any effort to appreciate its workings. Even in philosophy, we take for granted memory’s unflagging efforts. There is some mystery about how it supports good inductive reasoning, for example, though we recognize that good inductive reasoning relies on past observation. And memory is what allows this indispensable relying, almost by magic. How does memory help us believe and reason well, if it ever truly does? What might bottle it up and stop it? This entry surveys influential answers.