This is the second study I've seen on HN today that used a pool of subjects from Mechanical Turk.

By coincidence, I tried MT itself (as a worker) for the first time a few days ago, just to see what it was. It's mildly interesting, but one thing that immediately jumps out is that the pool of people actually working these tasks is probably very different from the general population.

Good enough for click-bait I suppose, but hope no one is trying to do serious science this way.