I am going to see if I can find some pithy excerpts on this. Unfortunately the subject is so complex that it's basically covered throughout his entire chapter 8....
Part of it is here but there is a longer discussion somewhere else that I will find:
at the moment at least I am not finding the additional discussion that I think exists somewhere else in EAHP about the comment made by Diogenes Laertius at line 31 (in case that's not clear already, which Bailey translates as "the Epicureans add to these the intuitive apprehensions of the mind" ===
Quote31] Logic they reject as misleading. For they say it is sufficient for physicists to be guided by what things say of themselves. Thus in The Canon Epicurus says that the tests of truth are the sensations and concepts and the feelings; the Epicureans add to these the intuitive apprehensions of the mind. And this he says himself too in the summary addressed to Herodotus and in the Principal Doctrines. For, he says, all sensation is irrational and does not admit of memory; for it is not set in motion by itself, nor when it is set in motion by something else, can it add to it or take from it.