Sure, you can say that not being tricked is smart, but if you're not even aware that the prosthetic represents your hand then you've extra-failed the test.
If the test depended on understanding that it's supposed to represent the real hand, then humans wouldn't fall for it. The brain just sees a hand and starts integrating the visual and tactile sensations despite full knowledge that it's not a real hand. Pretty dumb, eh?
> If the test depended on understanding that it's supposed to represent the real hand, then humans wouldn't fall for it.
I don't know why you would say that. Maybe you're interpreting 'represents' much more narrowly than I intended?
Go ahead and call it dumb all you want, it's much smarter than failing to notice that these two sets of stimuli are perfectly correlated. Misusing information is much closer to properly using it than to being incapable of comprehending it.