A new technological breakthrough allows scientists to see what people are imagining; they can even decipher what number a person has just seen, what video the person has just watched, or what particular memory the person is recalling.
Here's how the experiment went: Researchers gave 19 volunteers descriptions of four imaginary people, whose personalities had certain positive and negative attributes. The scientists gave names and genders to the imaginary people and asked those participating in the study to imagine how the fictitious people might behave in various situations. Then the scientists scanned each volunteer's brain, using functional magnetic resonance imaging (MRI), which analyzed the blood flow to different parts. They discovered that the volunteers' thinking about each fake person yielded a different pattern of activity. Therefore, the researchers could determine which person the volunteers were thinking about each time, without the volunteers' saying a word.