A while back, Murray Tucker posted an article summarizing the results of the McChesney blind experiment from 1991. The link to his post is provided. I believe these results are just below random guessing, but probably not significantly so. Unless someone finds a flaw in the test, I don't see what another blind test would prove.
http://forums.azbilliards.com/showpost.php?p=3286694&postcount=18
Interestingly enough, he says that 78% picked the same cues as what they liked best. There must have been a definable difference they could feel even if they didn't know what type they were trying out.
It doesn't matter that they didn't know what the cues were, they felt a difference and that is the point of the test not if they could guess what type of joint it was. They all felt a consistent difference in the cues.