Thanks Bryan ! I think we're on the same page.
This morning I listened to the Dr. Glidden interview again. He explicitly states that prolepseis are not infallible, which makes sense to me. But in this way he repeatedly separates them from sensations and feelings while leaving them in the Canon. He may have gone as far as to say that they're not true, but I'm interpreting that as not infallible. Riffing on this I get the notion that the three elements of the Canon all vary in degrees of infallibility:
- Sensations are true, but not infallible (as in the bent stick in the water, or the rounded or square tower)
- Anticipations can be true or false, so not infallible (as in the snake or stick illustration)
- Feelings are true and infallible. But they need to be carefully attended to in order to properly hear them (particularly wrt to those who incorrectly think that there is a "neutral zone".)
(I'm using infallible here to mean "a reliable source of information".)