Yes, something like that, although I seem to remember it being specifically about intelligence, and not experience. Pretty much the same curve though, albeit with non-zero Xinit and Yinit values. One is drawn to assume that that may (probably in part) have something to do with the fact that if you are too dim to reflect on your own intellectual capacity, you just don't.
From there, the very unintelligent think themselves average, the average think themselves a bit dimmer than they actually are, the smart... Usually know how smart they themselves are, but are prone to attributing intelligence to themselves and especially others, which they do not possess.
Thus, if the puma-person was for real, one may assume that he or she thought themselves clever in making that particular point in that particular fashion. An Asmo looking on it from the outside though, can not understand how such levels of ignorance are possible in someone capable of writing and manipulating pictures.