"I wanted to replicate this result myself. So a few months ago, when I surveyed readers of my blog, I included some questions about perceptual illusions (includ

"I wanted to replicate this result myself. So a few months ago, when I surveyed readers of my blog, I included some questions about perceptual illusions (including a static version of the hollow mask). I got five thousand responses, including a few from schizophrenic and autistic readers. Sure enough, the effect was there." Self-selection, numerous predictors, 5% threshold, no correction for multiple tests etc. Edit for the down-voters: these problems turn the whole thing into a useless exercise. Forget about it.