Your experience with Philodemus' On Methods of Inference seems like it would be directly relevant here:
Ah yes and you are reminding me that we have never made much effort to go through that, even though there are long and well preserved sections.
Joshua we are going to have to figure out where to put this in the list of things to talk about. Probably we need to pull out David Sedley's "On Signs" in addition to all the extensive discussion in the Delacy translation!
Given the interest in this subject maybe we need to bump it up on this list, but it will definitely take preparation, and probably some review of Sextus Empiricus as well. And it may even be possible that we ought to visit "Academic Questions" first because in a sense that's really the issue that Cicero summarizes for us there.