"Experimental Philosophy" -- Wide and Narrow
I'm a philosopher. For some reason, this hasn't prevented me from running experiments when I've felt they could shine some light on an issue troubling me. (I examined whether people still reported dreaming in black and white in the U.S. and in China, as part of exploring how well we know our own stream of experience; for similar reasons, I've given people beepers and had them report on their sensory experience; I'm also trying various things aimed at discerning whether ethicists behave better than other people.) By 20th-century standards, this is highly unusual behavior for a philosopher!
But as I'm sure you've noticed, this is the 21st century. I must be a man of my times, for I find I have company -- most notably the company of a group who call themselves "Experimental Philosophers" and perceive themselves, self-consciously, as a movement -- with a blog, for example, and bibliographies. As a movement, Experimental Philosophy ("X-Phi"!) has received considerable attention, both positive and negative (e.g., here and here).
The philosophers most central to this movement tend to poll undergraduates regarding their moral intuitions or their intuitions about traditional philosophical examples and puzzles. Tired of hearing one philosopher say something like, "Well, of course, our ordinary intuition in cases like X is such-and-such" and another respond with "Well, I don't have that intuition!", they quite sensibly decided to go out and see what people's intuitions actually were. Only in philosophy would it take sixty years to think of doing this! (I chose sixty years as approximately the beginning of the tendency to take ordinary intuition as the principal court of philosophical appeal; it's salutary to reflect on the brevity of this period relative to the entire history of philosophy.)
One might doubt how much we can learn about the world by polling undergraduate intuition (other than learning what undergraduate intuitions are -- which is actually a pretty important thing), but at a minimum the movement should put to an end cavalier philosophical appeals to ordinary intuition. It's good metaphilosophical conscience.
Construed as such a project, experimental philosophy is relatively fresh, controversial, and coherent as a movement. But here's the strange thing: Such philosophers often characterize "experimental philosophy" as experimental work done by philosophers [caveat: see comments section] to shine light on philosophical disputes (e.g., here). In this broader sense, "experimental philosophy" is much less coherent as a movement, and much older; and much of it is hard to distinguish from the sorts of things psychologists do.
In discussions of "experimental philosophy" I think there's often a problematic ambiguity between these broad and narrow senses, as though, implicitly, the participants assume that polling intuitions is the only kind of experimentation a philosopher could do that would shed light on a genuinely philosophical dispute....