In everyday life, we use previous experience to predict where we should pay attention. Different environments create different expectations. This was profoundly illustrated by the scientist Jared Diamond in his book Guns, Germs, and Steel. He describes an adventure wandering through the New Guinea jungle with native New Guineans. He relates that these natives tend to perform poorly at tasks Westerners have been trained to do since childhood. But they are hardly stupid. They can detect the most subtle changes in the jungle, good for following the tracks of a predator or for finding the way back home. They know which insects to leave alone, know where food exists, can build and tear down shelters with ease. Diamond, who had never spent time in such places, has no ability to pay attention to these things. Were he to be tested on such tasks, he also would perform poorly.