““Of course, dopamine didn’t evolve for crossing arbitrary lines on the ground. It evolved to release energy when you’re about to meet a survival need. If an ape climbs a high tree for a delicious mango, dopamine spurts as he nears the reward. That tells his body to release the reserve tank of energy, which helps him do what it takes to meet his needs. He doesn’t say “I did it!” in words, but neurochemicals create that feeling without need for words.””
