I don't know how to test it in humans. I developed a variant of SNePS with SNActor that used a single inference engine both to direct inference, and to make plans, about 24 years ago. But it was poor at identifying the right actions and propositions to think about (and was running on a 66MHz CPU with maybe 8M RAM), so it didn't do either inference or plan construction well, so I couldn't conclude anything from it. It was never worked into the main SNePS code branch, and the code is lost now, unless I have it on an old hard drive.