Most of the time, we learn only gradually, incrementally building connections between actions or events and outcomes. But there are exceptions–every once in a while, something happens and we immediately learn to associate that stimulus with a result. For example, maybe you have had bad service at a store once and sworn that you will never shop there again.

This type of one-shot learning is more than handy when it comes to survival–think, of an animal quickly learning to avoid a type of poisonous berry. In that case, jumping to the conclusion that the fruit was to blame for a bout of illness might help the animal steer clear of the same danger in the future. On the other hand, quickly drawing connections despite a lack of evidence can also lead to misattributions and superstitions; for example, you might blame a new food you tried for an illness when in fact it was harmless, or you might begin to believe that if you do not eat your usual meal, you will get sick.

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