Tania Lombrozo

Halloween plays on our fears and our fantasies.

We craft haunted houses and scary decorations to evoke particular emotions. We choose our costumes to reflect something about the kinds of people we are or want to be — edgy, sexy, funny, clever. For children, Halloween is an experiment in delayed gratification and negotiation — which candies to eat now, which to trade, which to save. It's no surprise, then, that Halloween might reveal interesting features of human psychology.

But you might be surprised by just what we can learn.