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When you step into an ice-cold lake, it would be nice if your body warned you about possible harm with a polite message: "Your feet may be at risk. Would you kindly consider stepping out?"

Instead, your feet hurt. A lot. Your attention narrows and getting out becomes an urgent priority. Friends' promises of fun suddenly matter much less. Why does information about possible bodily harm feel so unpleasant? Why can't we register the danger as calmly as we take in the lakeside trees?

Part of the answer begins with another question: what is perception for?

Perception helps living things navigate the world: finding food, avoiding danger and maintaining a healthy body. All of this helps us survive. But how does a nervous system figure out what is happening and what to do next?

We seem to experience the world directly: the lake, the trees, our friends wondering why we're making such a hasty exit. But the brain receives neither light nor sound directly. Instead, information from your eyes, ears, skin and internal organs reaches it through signals that include brief electrical impulses called "action potentials." These signals carry no labels explaining what they mean. Yet you experience trees, voices and freezing feet.

Predictive theories of perception offer a counterintuitive explanation. They propose that your nervous system uses experience to predict, or make educated guesses about, what incoming sensory information means.

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