I've mentioned conditional preferences before. These are preferences that are dependent on facts about the world, for example "I'd want to believe X if there are strong argument for X".

But there is another type of preference that is conditional: my tastes can vary depending on circumstances and on my past experience. For example, I might prefer to eat apples during the week and oranges on weekends. Or, because of the miracle of boredom, I might prefer oranges if (but only if) I've been eating apples all week so far.

What if I currently want apples, would want oranges tomorrow, but falsely believe (today) that I would want apples tomorrow? This is a known problem with "one-step hypotheticals", and a strong argument in practice for assessing preferences over time rather than at a single moment $t$.

In theory, there are meta-preferences that allow one to get this even at a single moment $t$, such as "I want to be able to follow my different tastes at different times" or a more formalised desire for variety and exploration.