Animals’ lives are essentially all about food, sex, and fear. If you can escape predators long enough to eat and reproduce, your genes will live to see another generation. That’s why fear is so important: it’s a warning sign that something is wrong and, if you don’t address the threat, you might not make it to the next meal.
Normally, scientists study fear in nonhumans in a pretty artificial way. Captive animals are trained to associate a harmless stimulus—say, a red light or a tone—with a nasty shock. Soon, just hearing the tone or seeing a colored light will send them cowering into a corner. But, this has little semblance to the evolutionary basis of fear. A pair of researchers has developed a new methodology that mimics natural conditions so that they can study fear in a more realistic way, and the paper appears in this week’s PNAS.
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