To illuminate all the regions involved in this decisionmaking process, the team trained mice to turn a small steering wheel to move circles on a screen. The resolution of the neural map produced is unprecedented in the study of brain and its neural networks during the thinking process. Although the scientists involved acknowledge that the data are not definitive, they represent a starting point in the neural study of decisionmaking. Although it weighs about 1.4 kilograms, the human brain consumes about 20 percent of the body’s total energy at rest, a remarkably high proportion for its size. There’s still a long way to go before neuroscience can fully map the neural processes of human decisionmaking, but studies like this one take us one step closer.