I still see the most cogent explanation of prolepsis as being the pattern recognition faculty that gives order to the cacophony of sense perception, including eidola falling on the mental sense perception faculty.
- Eidola bombard our senses from the external world.
- Perceiving those sensations are our confirmation there is a material, existing world.
- So it is true there is a material universe existing.
- Patterns of sensations that indicate individual objects and concepts are given shape by the prolepses.
- That there are individual discernible objects and concepts is true through the prolepses of them.
- Prolepses are reinforced and refined by repeated sensations.
- Sensations and prolepses automatically evoke feelings of pleasure or pain prior to any reasoning.
- Pleasure and pain are criteria of truth because they arise before reason kicks in, and the those external phenomena evoke feelings within us, again reconfirming the existence of a world outside ourselves.
That's how I make sense of prolepses and how they fit into being criteria of truth.