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Ok, I don't want to start something (I might want to start something) but this kind of analysis ticks me off. No, neuroscience does not explain why the brain conjures imaginary monsters. Neuroscience explains that the Troxler effect/staring at an image for a long time warps what you see. WHAT the brain fills in is supplied by a lifetime of cultural information. Summoning Bloody Mary is a ritual performed overwhelmingly by girls. She's associated with blood, mirrors, and thwarted motherhood, and conveniently peaks in popularity around the onset of puberty.
Diligent readers of Cracked already know that our brains can be tricked by just about anything: manipulated images , our birth order and shiny things. But we can also be tricked into being generous, good people by our surroundings. Of course, it goes the other way, too. Your morality at any given moment can be influenced by ... Obviously, we are more honest when someone (or a security camera) is watching us, but studies have actually shown that if any depiction of an eye is in view, even if it is cartoonish or nonhuman, it makes people less likely to cheat or to behave immorally. Put the bong down until the article is over.