I think David Glidden discusses some of this in his article "Epicurean Prolepsis";
QuoteIf we could determine how prolepseis arise, we might be in a position to determine their range. As I understand prolepsis, it cannot be the work of any particular sense organ, but it is a perceptual recognition of the mind as a result of the work of the separate sense organs. But if we assume it is the work of dianoia, it is still something we perceive in the world, not a rational reconstruction or hypothesis. Here the case of the gods is instructive. The mind, operating as a sixth sense sensitive to especially fine eidola, perceives the gods, just as it perceives phantoms in dreams. I suggest that this same apprehension of the mind, epibole tes dianoias, can perceive persistent characteristics characterizing the things it or the other sense faculties perceive, the sorts of things these things are. And so we have a prolepsis that the gods are blessed and immortal, over and above having a vision of them. Presumably these prolepseis are formed in the mind as a result of repeated experiences, allowing us to get acquainted with the persistent characters of things. As accumulated information, these prolepseis would be common to all familiar with the same sorts of experiences.
-Dr. David Glidden, "Epicurean Prolepsis", pp. 11-12