[mindcrime]

First, you can believe in the structures they purport to show without accepting the existence of UG, by appealing to the existence of general mechanisms in the brain for assembling hierarchical structures, which is equally validated by this experiment.

That was kinda my impression as well, but I don't want to say much more as I'm so far from an expert on this and I'll probably just make an idiot out of myself. Still, as you say, it is interesting work in its own right.